JP4749064B2 - Program, information storage medium, and image generation system - Google Patents

Description

  The present invention relates to a program, an information storage medium, and an image generation system.

  Conventionally, an image generation system (game system) that generates an image that can be viewed from a virtual camera (a given viewpoint) in an object space (virtual three-dimensional space) in which an object such as a character is set is known. It is popular as a place to experience so-called virtual reality. In such an image generation system, a conventional technique for drawing a contour line on the contour of an object is known.

  However, in the conventional image generation system, an outline is drawn for the purpose of generating a cell-like image peculiar to animation. For this reason, an outline of one color such as black is drawn on the outline of the object.

Further, in the conventional image generation system, for example, when the first and second objects appear to overlap each other when viewed from the viewpoint, the drawing of the outline at the boundary of the overlapping portion has not been considered much.
2001-84394

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an image generation system, a program, and an information storage medium that enable various expressions of the outline of an object. It is in.

  The present invention is an image generation system for generating an image, and includes an original image generation unit that generates an original image by drawing an object, draws the object with a drawing color set for each object, and sets an outline color of the object And a contour information image generation unit that generates a contour information image for contour detection, and a contour line drawing unit that draws a contour line of the object, the contour line drawing unit, based on the contour information image, The present invention relates to an image generation system that extracts a contour and draws a contour line with respect to the contour of the extracted object with a contour color set by the drawing color of the contour information image. The present invention also relates to a program that causes a computer to function as each of the above-described units. The present invention also relates to a computer-readable information storage medium that stores (records) a program that causes a computer to function as each unit.

  In the present invention, an original image and a contour information image are generated. This contour information image can serve as both a contour color setting image and a contour detection image. Then, the contour of the object is extracted based on the contour information image, and a contour line (a line along the contour) is drawn on the contour of the extracted object with the contour color set by the drawing color of the contour information image. . Accordingly, it becomes possible to draw contour lines having different contour colors for each object with a small processing load, and various expressions of the contour lines of the object are possible.

  In the image generation system, the program, and the information storage medium according to the present invention, the contour information image generation unit adjusts the contour color of the object so that the luminance changes according to the distance of the object from the viewpoint. The contour information image may be generated by drawing an object using the drawn color as the drawing color.

  In this way, even objects having the same contour color can be distinguished from each other according to the distance from the viewpoint.

  In the image generation system, the program, and the information storage medium according to the present invention, the contour drawing unit extracts luminance information from the drawing color of the contour information image, and based on the extracted luminance information, the contour of the object is extracted. May be extracted.

  In this way, the contour information image can be used as the contour detection image. It is also possible to extract the contour by associating the high and low luminances of the luminance information with the object's context (distance from the viewpoint).

  In the image generation system, the program, and the information storage medium according to the present invention, the contour line drawing unit performs addition processing of the values of the first, second, and third components of the drawing color of the contour information image. Thus, the luminance information may be extracted.

  In this way, luminance information can be extracted with a simple process. However, the extraction of luminance information is not limited to such a method.

  In the image generation system, the program, and the information storage medium according to the present invention, the contour drawing unit extracts color information from the drawing color of the contour information image, and uses a contour color corresponding to the extracted color information. You may make it draw the outline of an object.

  In this way, the contour information image can be used as the contour color setting image.

  In the image generation system, the program, and the information storage medium according to the present invention, the contour drawing unit extracts luminance information from the Kth component of the drawing color of the contour information image, and based on the extracted luminance information. Thus, the outline of the object may be extracted.

  In this way, the contour information image can be used as the contour detection image with a simple process.

  In the image generation system, the program, and the information storage medium according to the present invention, the contour drawing unit extracts contour color designation information from the Lth component of the drawing color of the contour information image, and the extracted contour color You may make it draw the outline of an object with the outline color designated by designation | designated information.

  In this way, the contour information image can be used as the contour color setting image with a simple process.

  In the image generation system, the program, and the information storage medium according to the present invention, the contour line drawing unit may be configured such that only one of the high brightness side or the low brightness is displayed when one side of the contour of the object has high brightness and the other side has low brightness. The outline of the object may be drawn only on the side.

  In this way, it is possible to prevent a situation in which an unnatural image is generated due to a double outline drawn.

  In the image generation system, the program, and the information storage medium according to the present invention, the contour line drawing unit is generated when generating the Z value generated when generating the original image and when generating the contour information image. Based on the Z value, it may be determined whether the pixel to be processed is a pixel on the contour line of the object.

  In this way, it is possible to draw a contour line by properly determining the object's context.

  In the image generation system, the program, and the information storage medium according to the present invention, the contour drawing unit includes a first object on the near side as viewed from the viewpoint and a second object on the back side as viewed from the viewpoint. When overlapping from the viewpoint, only the outline of the first object may be drawn at the boundary at the overlapping portion of the first and second objects.

  The present invention also relates to an image generation system for generating an image, an original image generation unit that generates an original image by drawing an object, a first object on the near side as viewed from the viewpoint, and a rear side as viewed from the viewpoint. An outline drawing unit that draws only the outline of the first object at the boundary of the overlapping portion of the first and second objects when the second object on the side overlaps when viewed from the viewpoint. Concerning image generation system including. The present invention also relates to a program that causes a computer to function as each of the above-described units. The present invention also relates to a computer-readable information storage medium that stores (records) a program that causes a computer to function as each unit.

  According to the present invention, when the first and second objects overlap when viewed from the viewpoint, the outline of the first object on the near side is drawn on the boundary of the overlapping portion, and the first object on the back side is drawn. It is possible to prevent the outline of the second object from being drawn. Therefore, it is possible to prevent a situation in which a double contour line or the like is drawn at the boundary of the overlapping portion and an unnatural image is generated.

  In the image generation system, the program, and the information storage medium according to the present invention, the outline drawing unit draws the outline of the object with the first outline color for the object belonging to the first attribute, and the second attribute. For an object belonging to, the contour line of the object may be drawn with the second contour color.

  The present invention is also an image generation system for generating an image, wherein an original image generation unit that generates an original image by drawing an object, and an object that belongs to a first attribute has an outline of the object in a first outline color. This relates to an image generation system including an outline drawing unit that draws a line and draws the outline of the object with the second outline color for objects belonging to the second attribute. The present invention also relates to a program that causes a computer to function as each of the above-described units. The present invention also relates to a computer-readable information storage medium that stores (records) a program that causes a computer to function as each unit.

  According to the present invention, contour lines of objects having different attributes are drawn with different contour colors. Therefore, the player (viewer) can grasp the attribute of the object by looking at the color of the contour line of the object, and various expressions of the contour line of the object that have never existed are possible.

  In the image generation system, the program, and the information storage medium according to the present invention, the outline drawing unit draws the outline of the object with the first outline color for an object belonging to the enemy group, and belongs to a group other than the enemy. For the object, the outline of the object may be drawn with the second outline color.

  In this way, the player (viewer) can determine whether the object belongs to the enemy group by looking at the color of the outline of the object, and an interface environment that enables smooth game progression. Can be provided.

  In the image generation system, the program, and the information storage medium according to the present invention, the outline drawing unit draws the outline of the object with the first outline color for the object having the first type information, and the second For an object having this type of information, the contour line of the object may be drawn with the second contour color.

  In this way, the player (viewer) can grasp the information that the object has by looking at the color of the outline of the object, and can provide an interface environment that enables smooth game progression.

  Hereinafter, this embodiment will be described. In addition, this embodiment demonstrated below does not unduly limit the content of this invention described in the claim. In addition, all the configurations described in the present embodiment are not necessarily essential configuration requirements of the present invention.

1. Configuration FIG. 1 shows an example of a functional block diagram of an image generation system (game system) of the present embodiment. Note that the image generation system of the present embodiment may have a configuration in which some of the components (each unit) in FIG. 1 are omitted.

  The operation unit 160 is for a player to input operation data, and the function can be realized by a lever, a button, a steering, a microphone, a touch panel display, a housing, or the like. The storage unit 170 serves as a work area for the processing unit 100, the communication unit 196, and the like, and its function can be realized by a RAM (VRAM) or the like.

  The information storage medium 180 (computer-readable medium) stores programs, data, and the like, and functions as an optical disk (CD, DVD), magneto-optical disk (MO), hard disk, or memory (ROM). It can be realized by. The processing unit 100 performs various processes of the present embodiment based on a program (data) stored in the information storage medium 180. That is, the information storage medium 180 stores a program for causing a computer to function as each unit of the present embodiment (a program for causing a computer to execute processing of each unit).

  The display unit 190 outputs an image generated according to the present embodiment, and its function can be realized by a CRT, LCD, touch panel display, HMD (head mounted display), or the like. The sound output unit 192 outputs the sound generated by the present embodiment, and its function can be realized by a speaker, headphones, or the like.

  The portable information storage device 194 stores player personal data, game save data, and the like. Examples of the portable information storage device 194 include a memory card and a portable game device. The communication unit 196 performs various controls for communicating with the outside (for example, a host device or other image generation system), and functions thereof are hardware such as various processors or communication ASICs, programs, and the like. It can be realized by.

  A program (data) for causing a computer to function as each unit of the present embodiment is distributed from the information storage medium of the host device (server) to the information storage medium 180 (or storage unit 170) via the network and communication unit 196. May be. Use of the information storage medium of such a host device (server) can also be included in the scope of the present invention.

  The processing unit 100 (processor) performs processing such as game processing, image generation processing, or sound generation processing based on operation data and programs from the operation unit 160. Here, as the game process, a process for starting a game when a game start condition is satisfied, a process for advancing the game, a process for placing an object such as a character or a map, a process for displaying an object, and a game result are calculated. There is a process or a process of ending a game when a game end condition is satisfied. The processing unit 100 performs various processes using the storage unit 170 as a work area. The functions of the processing unit 100 can be realized by hardware such as various processors (CPU, DSP, etc.), ASIC (gate array, etc.), and programs.

  The processing unit 100 includes an object space setting unit 110, a movement / motion processing unit 112, a virtual camera control unit 114, an image generation unit 120, and a sound generation unit 130. Note that some of these may be omitted.

  The object space setting unit 110 is composed of various objects (polygons, free-form surfaces, subdivision surfaces, etc.) representing display objects such as characters, buildings, stadiums, cars, trees, pillars, walls, and maps (terrain). (Object) is set in the object space. In other words, the position and rotation angle of the object in the world coordinate system (synonymous with direction and direction) are determined, and the rotation angle (rotation angle around the X, Y, and Z axes) is determined at that position (X, Y, Z). Arrange objects.

  The movement / motion processing unit 112 performs a movement / motion calculation (movement / motion simulation) of an object (such as a character, a car, or an airplane). That is, an object (model object) is moved in the object space or an object is moved based on operation data input by the player through the operation unit 160, a program (movement / motion algorithm), various data (motion data), or the like. Perform processing (motion, animation). Specifically, a simulation process for sequentially obtaining object movement information (position, rotation angle, speed, or acceleration) and motion information (part object position or rotation angle) every frame (1/60 second). Do. A frame is a unit of time for performing object movement / motion processing (simulation processing) and image generation processing.

  The virtual camera control unit 114 performs a virtual camera (viewpoint) control process for generating an image viewed from a given (arbitrary) viewpoint in the object space. Specifically, a process for controlling the position (X, Y, Z) or the rotation angle (rotation angle about the X, Y, Z axes) of the virtual camera (process for controlling the viewpoint position and the line-of-sight direction) is performed.

  For example, when an object (eg, character, ball, car) is photographed from behind using a virtual camera, the position or rotation angle of the virtual camera (the direction of the virtual camera is set so that the virtual camera follows changes in the position or rotation of the object. ) To control. In this case, the virtual camera can be controlled based on information such as the position, rotation angle, or speed of the object obtained by the movement / motion processing unit 112. Alternatively, the virtual camera may be controlled to rotate at a predetermined rotation angle or to move along a predetermined movement path. In this case, the virtual camera is controlled based on the virtual camera data for specifying the position (movement path) or rotation angle of the virtual camera. When there are a plurality of virtual cameras (viewpoints), the above control process is performed for each virtual camera.

  The image generation unit 120 performs drawing processing based on the results of various processes (game processing) performed by the processing unit 100, thereby generating an image and outputting the image to the display unit 190. When generating a so-called three-dimensional game image, first, a vertex list including vertex data (vertex position coordinates, texture coordinates, color data, normal vector, α value, etc.) of each vertex of the object is input and input. Based on the vertex data included in the vertex list, vertex shading (vertex processing in a broad sense) is performed. When performing vertex shading, vertex generation processing (tessellation, curved surface division, polygon division) for subdividing a polygon can be performed as necessary. In vertex shading, according to the vertex shader program (first shader program in a broad sense), vertex movement processing, coordinate transformation (world coordinate transformation, camera coordinate transformation), clipping processing, or geometric processing such as perspective transformation is performed. On the basis of the processing result, the vertex data given to the vertex group constituting the object is changed (updated or adjusted). Then, rasterization (scan conversion) is performed based on the vertex data after vertex shading, and pixel shading (pixel processing and fragment processing in a broad sense) that draws pixels (fragments that configure the display screen) that constitute the display image Is done. In pixel shading, according to the pixel shader program (second shader program), various processes such as texture reading (texture mapping), color data setting / change, translucent composition, anti-aliasing, etc. are performed, and the final display image is displayed. The drawing color of the pixel is determined, and the drawing color of the perspective-transformed object is output to the frame buffer 172 (buffer that can store image information in units of pixels. Drawing buffer, display buffer, back buffer, front buffer, work buffer, VRAM). (draw. That is, in pixel shading, per-pixel processing for setting or changing image information (color, normal, luminance, α value, etc.) for each pixel of a display image is performed. As a result, an image (frame image) that can be seen from the virtual camera (given viewpoint) in the object space is generated. In addition, when there are a plurality of virtual cameras (viewpoints), a frame image can be generated so that an image seen from each virtual camera can be displayed on one screen as a divided image.

  The image generation unit 120 includes an original image generation unit 122, a contour information image generation unit 124, and a contour line drawing unit 128. Note that some of these may be omitted.

  The original image generation unit 122 performs processing for drawing an object and generating an original image. Specifically, for example, an original image is generated by drawing an object (primitive surface) in a frame buffer (drawing buffer) 172 while performing hidden surface removal using a Z buffer 176 that stores Z values. The Z value of the original image is generated (stored) on the Z buffer 176 by the Z buffer method (depth comparison method) performed at the time of the drawing process. Note that the Z value (depth value) of the present embodiment may be the Z value itself of the Z coordinate axis of the camera coordinate system, or may be a parameter that is mathematically equivalent to this Z value.

  The contour information image generation unit 124 generates a contour information image (texture image). Specifically, the object is drawn with the drawing color (specified color) set (specified) for each object (for each object attribute), and the contour information image (for contour color setting) for setting the contour color of the object and detecting the contour Image, contour detection image). For example, objects with different attributes are drawn with different drawing colors. Specifically, the first attribute object is drawn in the first drawing color, and the second attribute object is drawn in the second drawing color to generate a color-coded contour information image. The drawing color in this case can be set as, for example, the surface material (attribute information) of the object.

  For example, the contour information image generation unit 124 adjusts the contour color of the object so that the luminance (brightness) changes according to the distance (depth distance, Z value) of the object from the viewpoint, and the adjusted color is the drawing color. Draw the object as Alternatively, luminance information is set in the Kth component (any one of the first to third components) of the drawing color, and the contour color is set in the Lth component (any one of the first to third components). Set the specified information and draw the object. Note that a Z value (depth value) may be set for the Mth component (any one of the first to third components) of the drawing color of the contour information image.

  The outline drawing unit 128 extracts (detects) the outline of the object, and draws the outline in the drawing color with respect to the extracted outline of the object. Specifically, the contour of the object is extracted based on the contour information image, and a contour line is drawn on the extracted contour of the object with the contour color set by the drawing color of the contour information image. For example, when the contour color of an object is adjusted according to the distance of the object from the viewpoint, luminance information is extracted from the drawing color that is the adjustment color, and the contour of the object is extracted based on the extracted luminance information. In this case, the contour line drawing unit 128 can extract luminance information by performing addition processing of values of first, second, and third components (for example, R, G, and B components) of the drawing color. This addition process may be a process of simply adding the first, second, and third component values, or a process of multiplying the first, second, and third components by a coefficient and adding them. May be.

  The contour drawing unit 128 extracts color information from the drawing color of the contour information image, and draws the contour of the object with the contour color set by the extracted color information.

  When the luminance information is set in the Kth component of the drawing color of the contour information image, the contour line drawing unit 128 extracts the luminance information from the Kth component of the drawing color of the contour information image and extracts it. The outline of the object may be extracted based on the luminance information. When the contour color designation information (the contour color index number) is set as the Lth component of the drawing color of the contour information image, the contour drawing unit 128 uses the Lth component of the drawing color of the contour information image. The contour color designation information is extracted from the image, and the contour line of the object is drawn with the contour color specified by the extracted contour color designation information.

  In addition, the contour drawing unit 128 has a high brightness side (one side) when one side (outside, one side inside) of the object has high brightness and the other side (the other side, outside or inside) has low brightness. Draw the outline of the object only on the side. Alternatively, the outline of the object may be drawn only on the low luminance side (the other side). Such a drawing process can be realized by, for example, a Laplacian filter.

  The contour drawing unit 128 performs processing based on the Z value (depth value) finally generated when the original image is generated and the Z value finally generated when the contour information image is generated. It is determined whether or not the target pixel is an outline pixel of the object. Specifically, when the Z value of the contour information image is closer to the near side as viewed from the viewpoint than the Z value of the original image, it is determined that the processing target pixel is a pixel of the contour line of the object. .

  The contour line drawing unit 128 also displays the first and second objects when the first object on the near side as viewed from the viewpoint overlaps with the second object on the far side as viewed from the viewpoint. Only the contour line of the first object is drawn at the boundary (contour) in the overlapping portion. That is, the outline of the first object on the near side is drawn without drawing the outline of the second object on the back side.

  The outline drawing unit 128 draws the outline of the object with different drawing colors for objects having different attributes. For example, for an object belonging to the first attribute (an object belonging to an enemy group, an object having important first type information, etc.), the outline of the object is drawn with the first outline color. On the other hand, for an object belonging to the second attribute (an object belonging to a group other than the enemy, an object having the acquired second type information, etc.), the outline of the object is drawn with the second outline color. Such contour drawing can be realized by the following method, for example. That is, a table for associating the attribute flag of the object with the outline color (drawing color) of the object is prepared. Then, based on the attribute flag of the object, the outline color of the object is read from the table, and the outline of the object is drawn with the read outline color.

  The sound generation unit 130 performs sound processing based on the results of various processes performed by the processing unit 100, generates game sounds such as BGM, sound effects, or sounds, and outputs the game sounds to the sound output unit 192.

  Note that the image generation system of the present embodiment may be a system dedicated to the single player mode in which only one player can play, or may be a system having a multiplayer mode in which a plurality of players can play. Further, when a plurality of players play, game images and game sounds to be provided to the plurality of players may be generated using one terminal, or connected via a network (transmission line, communication line) or the like. Alternatively, it may be generated by distributed processing using a plurality of terminals (game machine, mobile phone).

2. 2. Method according to this embodiment 2.1 First method In this embodiment, the outline of an object is drawn with a different drawing color for each object. For example, for an object (passerby, door, signboard, etc.) on the game screen, you can see at a glance the states such as “I have some information” or “I have already investigated and collected information” The goal is to add color-coded contours to each object so that they can be identified. A first method for realizing such color-coded contour drawing will be described first.

  In this first method, an original image is generated by drawing an object. Further, as shown in FIG. 2, the object is drawn by color-coding with the drawing color set for each object, and an outline color reference image for referring to the outline color of the object is generated. For example, in FIG. 2, an object OB1 that is a contour drawing target is drawn with a green drawing color that is the contour color, and an object OB2 that is also a contour drawing target is a red drawing color that is the contour color. Drawn. Further, the object OB3 that is not the object of contour drawing is drawn in black. In this case, since these objects OB1, OB2, and OB3 are drawn using the Z buffer, the portion indicated by A1 in the object OB2 is hidden by the front object OB3. This is because, in the portion indicated by A1, the object OB2 is not displayed even in the original image that is the game screen, and the contour line is not to be drawn.

  Next, as shown in FIG. 3, a contour detection image for detecting the contour of the object is generated. Specifically, the object for contour drawing is drawn with the identification information color obtained from the identification information (identification number) uniquely set for each object, and the contour detection image as shown in FIG. Generate.

  Next, the contour of the object is extracted based on the contour detection image shown in FIG. Specifically, for example, identification information colors (identification numbers) of four pixels (upper left, lower left, upper right, and lower right pixels) around the pixel to be processed are referred to. And based on the difference value (specifically, the square of (upper left-lower right) + (lower left-upper right) square), it is determined whether the pixel to be processed is a pixel of the contour line of the object, Extract the outline of the object. For example, FIG. 4 shows a visualization of the extracted contour. As shown in FIG. 4, in the first method, the boundary portion (the portion indicated by B1) of the object OB2 whose hidden surface has been erased by the object OB3 on the near side is also extracted as the outline of the object OB2.

  Next, a contour line is drawn on the contour of the extracted object with the contour color referred to in the contour color reference image of FIG. Specifically, in FIG. 2, the objects OB1 and OB2 to be drawn with the outline are drawn with the α value set to 1.0 (predetermined value in a broad sense) representing, for example, opacity. When the processing target pixel is a pixel of the contour line of the object and the α value of the processing target pixel is set to 1.0, the contour color referred to in the contour color reference image becomes the color of the processing target pixel. Is set. As a result, a green contour line is drawn on the object OB1, a red contour line is drawn on the object OB2, and a final image with a contour line as shown in FIG. 5 is generated.

  Now, with the first method, an unnatural contour image is generated at the portions indicated by C1 and C2 in FIG. For example, in FIG. 5, the object OB1 is on the near side when viewed from the viewpoint, and the object OB2 is on the far side. Therefore, only the green outline color of the object OB1 should be drawn at the boundary at the overlapping portion of the objects OB1 and OB2 shown in C1.

  However, as shown in FIG. 6 which is an enlarged view of the portion C1 in FIG. 5, not only the green outline of the object OB1 but also the red outline of the object OB2 is drawn at the boundary of the overlapping portion shown in D1. ing. Accordingly, the outline appears double in the portion indicated by D1, resulting in an unnatural image. Due to this double outline, the player cannot grasp the context of the objects OB1 and OB2. Further, as indicated by C2 in FIG. 5 and D2 in FIG. 6, there is a problem that a contour line that should not be drawn is drawn.

2.2 Second Method Next, a second method of the present embodiment that realizes drawing of color-coded contour lines will be described. In this second method, in order to solve the problem of the first method described above, when the objects OB1 and OB2 overlap each other when viewed from the viewpoint, only the outline of OB1 at the boundary at the overlapping portion of OB1 and OB2 is obtained. I try to draw. Specifically, for example, a contour line is drawn by the method described below.

  First, as shown in FIG. 7, objects OB1, OB2, and OB3 are drawn to generate an original image (normal game screen). That is, the geometry processing of the objects OB1, OB2, and OB3 is performed, and the object after the geometry processing is drawn in a frame buffer (drawing buffer on the game screen), thereby generating an original image as shown in FIG. In this case, an object shading process or the like is performed based on the illumination model, and a realistic three-dimensional image is generated. Also, the Z value of the Z buffer generated when generating the original image in FIG. 7 is stored for use in later processing. For example, FIG. 8 shows a visualization of the Z value (depth value) of the Z buffer. In FIG. 8, the Z value is visualized so that the near side becomes darker and the far side becomes brighter when viewed from the viewpoint.

  Next, as shown in FIG. 9, the object is drawn in another buffer with the drawing color set for each object, and an outline information image is generated. This contour information image is an image that serves as both the contour color reference image (contour color setting image) in FIG. 2 and the contour detection image (depth value reference image) in FIG. Further, the Z value of the Z buffer generated when generating the contour information image of FIG. 9 is stored for use in later processing. For example, FIG. 10 shows a visualization of the Z value (depth value) of the Z buffer. In FIG. 10, the Z value is visualized so that the near side becomes darker and the far side becomes brighter when viewed from the viewpoint.

  In FIG. 9, the objects OB1 and OB2 that are the targets for contour drawing are drawn in the drawing colors set for them, and the object OB3 that is not the subject for contour drawing is not drawn. In the contour color reference image of FIG. 2 of the first method, the object OB3 is also drawn in black, so the portion indicated by A1 in FIG. 2 is erased by the Z buffer. On the other hand, in FIG. 9, the portion hidden by the near object OB3 in the object OB2 is also drawn.

  In FIG. 9, the drawing colors of the objects OB1 and OB2 are set so that the brightness at the back becomes lower depending on the positions of the objects OB1 and OB2. Specifically, the outline colors of the objects OB1 and OB2 are adjusted so that the luminance changes according to the distance of the object from the viewpoint (for example, the depth distance), and the objects OB1 and OB2 are drawn using the adjusted colors as drawing colors. is doing.

  For example, in FIG. 14A, the object OB1A is arranged on the near side when viewed from the viewpoint VP, OB1C is arranged on the back side, and OB1B is arranged between OB1A and OB1C. That is, when considering a coordinate system in which the Z value increases as the distance from the viewpoint increases, the Z values Z1A, Z1B, and Z1C of the representative points of the objects OB1A, OB1B, and OB1C have a relationship of Z1A <Z1B <Z1C. The designated drawing color of the objects OB1A, OB1B, and OB1C is green. Accordingly, in this case, the objects OB1A, OB1B, and OB1C are drawn in the drawing colors of bright green, medium-brightness green, and dark green, respectively.

  In FIG. 14A, the object OB2A is disposed on the near side as viewed from the viewpoint VP, the OB2C is disposed on the back side, and the OB2B is disposed between OB2A and OB2C. That is, the Z values Z2A, Z2B, and Z2C of the representative points of the objects OB2A, OB2B, and OB2C have a relationship of Z2A <Z2B <Z2C. The designated drawing color of the objects OB2A, OB2B, and OB2C is red. Therefore, in this case, the objects OB2A, OB2B, and OB2C are drawn in the drawing colors of bright red, medium-brightness red, and dark red, respectively.

  9 and 14A, the object is drawn with a drawing color that becomes lower in brightness as it goes from the viewpoint to the back side, but even if the object is drawn with a drawing color that becomes brighter as it goes from the viewpoint to the back side, Good. In FIGS. 9 and 14A, the drawing color is adjusted based on the Z value of the representative point of the object. However, the drawing color may be adjusted based on the Z value of each pixel. .

  Next, the contour of the object is extracted based on the contour information image generated in FIG. That is, the pixel that becomes the outline of the object is detected.

  In this case, attention is paid only to the luminance without considering the color of the contour information image. That is, the luminance information is extracted from the drawing color of the contour information image of FIG. 9, and the contour of the object is extracted based on the extracted luminance information. For example, the color value is composed of three primary colors of red, green, and color. Therefore, the luminance information can be extracted simply by adding the R, G, and B values of the pixel drawing color. That is, luminance information can be extracted by performing addition processing of R, G, and B components (first, second, and third components in a broad sense) of the drawing color of the contour information image.

  For example, in FIG. 14B, when (R, G, B) = (0.5, 0.0, 0.0), the extracted luminance information is 0.5 + 0.0 + 0.0 = 0. .5. When (R, G, B) = (0.0, 0.1, 0.0), the extracted luminance information is 0.0 + 0.1 + 0.0 = 0.1. Note that a value obtained by performing a conversion process on a value obtained by the addition process may be set in the luminance information.

  For example, a Laplacian filter as shown in FIG. That is, when the pixel value of 9 pixels (in this case, luminance) centered on the pixel to be processed is multiplied by the coefficient shown in FIG. The pixel is determined to be a pixel of the outline of the object. For example, FIG. 11 shows a visualization of the extracted contour. For example, in the first method of FIG. 4, the boundary (the boundary indicated by B1) of the portion of the object OB2 whose hidden surface has been erased by the object OB3 on the near side is also extracted as the contour of the object OB2. On the other hand, in the second method shown in FIG. 11, the boundary is not extracted as a contour as indicated by E1.

  Next, the contour information image of FIG. 9 is used to obtain the contour color. That is, in the first method, two images of the contour color reference image of FIG. 2 and the contour detection image of FIG. 3 are used. However, in the second method, the contour information image is used for contour color setting (contour color). Used for both reference and contour detection. Further, when the contour information image is used for setting the contour color, the luminance is ignored and color information such as red and green is referred to. That is, the color information is extracted from the drawing color of the outline information image, and the outline of the object is drawn with the outline color corresponding to the extracted color information. For example, the color information of green and yellow is extracted from the contour information image of FIG. 3, and the contour lines of the objects OB1 and OB2 are drawn with the contour colors of green and yellow.

  Specifically, the color value is composed of three primary colors of red, green, and yellow, and the values of R, G, and B are in the range of 0.0 to 1.0, respectively. Therefore, if the R, G, and B values are rounded up to an integer, color information with reduced luminance can be obtained. Such integerization can be realized by a Ceil instruction of the pixel shader. For example, in FIG. 14B, when (R, G, B) = (0.5, 0.0, 0.0), the extracted color information is (1.0, 0.0, 0.0). That is, the outline color is the primary color red. When (R, G, B) = (0.0, 0.1, 0.0), the extracted color information is (0.0, 1.0, 0.0). That is, the outline color is the primary color green.

  Finally, a contour image is synthesized with the original image (game screen) of FIG. That is, contour lines are drawn on the contours of the objects OB1 and OB2 extracted from the contour information image of FIG. 9 with the contour colors (green and red) extracted from the contour color of the contour information image of FIG. .

  In this case, the contour portion indicated by E1 in the contour of the object OB2 in FIG. 11 is on the back side of the object OB3 in FIG. 12, and the hidden surface should be erased. Therefore, the final pixel value is determined by performing Z value comparison (depth comparison) for the pixels in the contour portion. Specifically, the Z value shown in FIG. 8 generated when the original image is generated and the Z value shown in FIG. 10 generated when the contour information image is generated are also referred to. That is, based on the Z value generated at the time of generating the original image and the Z value generated at the time of generating the contour information image, it is determined whether or not the processing target pixel is a pixel of the contour line of the object. When the contour portion is on the near side when viewed from the viewpoint, the contour color is adopted as the pixel value of the synthesis result, and the pixel value of the original image (game screen) is adopted as the pixel value of the synthesis result otherwise.

  For example, in the contour portion indicated by E1 in FIG. 11, the Z value in FIG. 8 generated when generating the original image in FIG. 7 is more than the Z value in FIG. 10 generated in the case of the contour information image in FIG. Is also small (the Z value on the near side). Accordingly, in this case, the pixel values (R, G, and B values) of the original image in FIG. 7 are adopted as the final synthesized pixel values. On the other hand, in the contour portion indicated by E2 in FIG. 11, the Z value in FIG. 10 generated in the contour information image in FIG. 9 is the Z value in FIG. 8 generated in the original image generation in FIG. Smaller than. Therefore, in this case, the contour color (red) extracted from the contour information image of FIG. 9 is adopted as the pixel value of the final synthesis result. As described above, a final image to which a contour line as shown in FIG. 12 is added is generated.

  The first method of FIG. 5 has a problem that an unnatural outline image is generated at the portions indicated by C1 and C2. That is, as shown in the enlarged view of FIG. 6, a contour line is drawn twice in the portion indicated by D1, or a contour line that should not be drawn as shown in C2 of FIG. 5 or D2 of FIG. It will be drawn.

  On the other hand, in the second method, an unnatural outline image is not generated even in the portions indicated by F1 and F2 in FIG. For example, as shown in FIG. 13 which is an enlarged view of the portion F1 in FIG. 12, only the green outline of the object OB1 on the near side is drawn at the boundary of the overlapping portion shown in G1. That is, the problem of the first method that the contour line appears double in the portion indicated by G1 is solved. Therefore, the player can accurately grasp the front-rear relationship between the objects OB1 and OB2. Further, as indicated by F2 in FIG. 12 and G2 in FIG. 13, the problem of the first technique that an outline that should not be drawn is drawn.

  That is, in the first method of FIG. 4, the boundary indicated by B1 between the object OB2 and the near object OB3 is also extracted as the contour of the object OB2. On the other hand, this boundary is not extracted as a contour in the second method of FIG. Accordingly, it is possible to prevent a situation in which a contour line is drawn in the portion indicated by F2 in FIG. At this time, in the second method, the processing target pixel is a pixel of the contour line of the object based on the Z value generated when the original image is generated and the Z value generated when the contour information image is generated. Judgment whether or not. Therefore, it is possible to prevent a situation in which a contour line is drawn at a portion indicated by E1 in FIG.

  In the second method, a Laplacian filter as shown in FIG. 15A is applied, so that when one side of the contour of the object has high luminance and the other side has low luminance, a contour line is drawn only on the high luminance side. Is done.

  For example, in FIG. 15B, the pixel value on the right side (one side) of the contour ED has high luminance, and the pixel value on the left side (other side) of the ED has low luminance. In this case, when the Laplacian filter of FIG. 15A is applied to the processing target pixel 200 of FIG. 15B, the result value is +1.5. Therefore, it is determined that the processing target pixel 200 is a pixel constituting an outline. On the other hand, when the Laplacian filter of FIG. 15A is applied to the processing target pixel 202 of FIG. 15C, the result value is −1.5. Therefore, it is determined that the processing target pixel 202 is not a pixel constituting the contour line. Therefore, when such a Laplacian filter is applied, the contour line EDL is drawn only on the high luminance side of the contour ED, as shown in FIG. Therefore, also in the portion indicated by G1 in FIG. 13, a green outline is drawn only on the near object OB1 (inside OB1) where the drawing color is set to high luminance, and the drawing color is set to low luminance. The contour line is not drawn on the side object OB2. As a result, it is possible to prevent a situation where a double contour line as shown in FIG. 6 is drawn.

  That is, in the first method, as shown in FIG. 14A, the drawing color at the time of generating the contour image information is adjusted so that the brightness of the object on the near side as viewed from the viewpoint becomes brighter. Therefore, it is ensured that the object on the near side as viewed from the viewpoint has high brightness and the object on the back side has low brightness. Accordingly, as shown by G1 in FIG. 13, only the outline (green) of the high-luminance object OB1 on the near side as viewed from the viewpoint is drawn, and the outline (red) of the low-luminance object OB2 on the back side is drawn. It will not be drawn. That is, when the object OB1 on the near side when viewed from the viewpoint and the object OB2 on the far side when viewed from the viewpoint overlap with each other when viewed from the viewpoint, the object OB1 and OB2 overlap at the boundary (G1 in FIG. 13). Only the outline of OB1 is drawn.

  In FIGS. 15A, 15B, and 15C, the outline is drawn only on the high luminance side, but the outline may be drawn only on the low luminance side. In this case, for example, a Laplacian filter in which a coefficient different from that shown in FIG. In this case, in the generation of the contour information image in FIG. 14A, the drawing color of the object may be adjusted so that the luminance increases as the distance from the viewpoint increases.

  Further, the generation method of the contour information image is not limited to the method shown in FIG. For example, as shown in FIG. 14C, luminance information is set for the R component (Kth component in a broad sense), and outline color designation information (color table index) is set for the G component (Lth component in a broad sense). An outline information image may be generated by drawing an object to be drawn with a drawing line with a drawing color for which (number) is set. In this case, luminance information may be extracted from the R component (Kth component) of the drawing color of the contour information image, and the contour of the object may be extracted based on the extracted luminance information. Further, the contour color designation information may be extracted from the G component (Lth component) of the drawing color of the contour information image, and the contour line of the object may be drawn with the contour color specified by the extracted outline color designation information. A Z value (depth value) may be set for the B component (the Mth component in a broad sense).

  Note that the luminance information set for the R component in FIG. 14C is desirably adjusted in accordance with the distance of the object from the viewpoint, as in the method of FIG. For example, the luminance information is adjusted so that the distance from the viewpoint increases as the distance of the object increases. Setting luminance information in this way makes it possible to distinguish the front-rear relationship between objects of the same drawing color. Accordingly, in FIG. 13, the contour line can be drawn only on the object OB1 on the near side as viewed from the viewpoint. Note that the luminance information set in the R component of the drawing color may be adjusted so that the object becomes brighter as the distance from the viewpoint increases.

2.3 Drawing Contour Lines for Each Object Attribute In this embodiment, contour lines having different outline colors are drawn for objects having different attributes. For example, in FIG. 12, for the object OB1 belonging to the first attribute, the contour line of OB1 is drawn in green (first contour color in a broad sense). On the other hand, for the object OB2 belonging to the second attribute, the outline of OB2 is drawn in red (second drawing color in a broad sense). Note that the number of attributes and the number of contour colors are not limited to two and can be three or more.

  For example, FIG. 16 shows an example of a game screen (game image) generated in the present embodiment. In this game, it is assumed that in the near future, a player searches for a town wearing goggles sunglasses. By wearing the goggles side sunglasses and setting the scan mode, the player can know whether the character in the town is an enemy or a friend. Further, it is possible to know whether an item whose contents are checked by pressing a button on the operation unit is an item having important information or not.

  In the game screen of FIG. 16, the character (object in a broad sense) CH1 belongs to the enemy group, and therefore the outline of CH1 is drawn with a red outline color (first outline color), for example. On the other hand, since the characters CH2, CH3, and CH4 belong to a group other than the enemy (an irrelevant group such as an ally group and a passerby), for example, the contours of CH2, CH3, and CH4 are green contour colors (second contour colors). A line is drawn. Such drawing of the color-coded contour lines can be realized by the first and second methods of the present embodiment described above.

  For example, in the conventional contour drawing, a contour is drawn for the purpose of generating a cell-like image peculiar to animation. For this reason, the outline drawn on the outline of the object is only one color such as black, and the color-coded outline is not drawn.

  On the other hand, in this embodiment, as shown in FIG. 16, contour lines having different contour colors are drawn on objects having different attributes. In this way, the player can determine the attribute of the object simply by looking at the color of the outline, and the outline can be used for a different purpose.

  For example, in FIG. 16, the player can easily determine whether the character is an enemy or a non-enemy by looking at the color of the outline added to the character. Accordingly, it is possible to prevent a player surrounded by a large number of characters from knowing which is an enemy and which is an ally and confusing game play. Particularly in recent games, it has become possible to make a large number of characters appear in the game space by improving the ability of the image generation system. Therefore, in such an image generation system, a technique for discriminating enemies by the outline color as shown in FIG. 16 is effective.

  In this type of game, items (objects in a broad sense) arranged in the game space (object space) are examined, information is collected, and the game is advanced based on the collected information. In this case as well, in this embodiment, for an item (object) having the first type of information (for example, important information), a contour line is drawn with the first outline color, and the second type of information (for example, important information) Contour lines are drawn in the second contour color for items having non-information or collected information). In this way, the player can grasp the content of the information that the item has only by looking at the color of the outline added to the item. Therefore, even when a large number of items are arranged in the game space, the player can smoothly advance the game.

  Note that the color coding method of the contour line of the present embodiment is not limited to the above-described method. For example, the color coding target of the outline may be other than a character or item. The contour lines may be color-coded based on the attributes of the object other than the group type and the information type. In addition, the contour lines may be color-coded by a method other than the first and second methods of the present embodiment.

2.4 Detailed Processing Example Next, a detailed processing example of this embodiment will be described with reference to the flowcharts of FIGS. 17 and 18. 17 and 18 show processing examples of the second method.

  First, texture A is set as a drawing destination (step S31). Then, the Z buffer is cleared (erased) (step S32). Specifically, the Z value of the Z buffer is cleared to the maximum value (the deepest value). Then, the normal game screen (original image) is drawn, and at the same time, the Z value is output to the α channel of the texture A as the drawing destination (step S33). As a result, an image as shown in FIG. Further, the Z value as shown in FIG.

  Next, texture B is set as a drawing destination (step S34). Then, the R, G, B, and α channels of texture B are cleared (step S35). Specifically, the value is cleared to black (0.0). Then, the Z buffer is cleared (step S36).

  Next, for each object that is the subject of contour drawing, foremost according to the distance from the viewpoint of the representative point (origin) of each object to the specified contour color (primary colors of red, green, and blue) of each object Drawing is performed in a single color with brightness adjusted so that the side is bright and the back side is dark, and at the same time, the Z value is output to the α channel of the texture B of the drawing destination (step S37). In other words, the object to be drawn is drawn by the method described with reference to FIG. As a result, an image as shown in FIG. Also, the Z value as shown in FIG.

  Next, texture C (frame buffer) is set as a drawing destination (step S38). Then, the pixel shader process is performed for the pixels at the corresponding positions of the texture A and the texture B, and the processing results for all the pixels of the drawing destination are output (step S39). Then, the texture C is displayed (step S40). That is, the texture C is texture-mapped to a screen-size primitive surface (sprite, polygon), and the obtained image is output to the display unit. When a physical strength gauge, a simple map, or the like is displayed over the game screen, the texture D and the texture C for displaying the physical strength gauge and the simple map are displayed on the screen size primitive surface. Texture mapping may be performed.

  FIG. 18 is a flowchart of the pixel shader process performed in step S39 of FIG. Specifically, a pixel shader program that performs the processing of FIG. 18 is transferred to a pixel shader circuit included in the image generation system. Then, the pixel shader circuit interprets commands described in the pixel shader program, and executes processing according to each command. This process is performed for all pixels on the screen.

  In the pixel shader process, first, it is determined whether or not all of the R, G, and B values of the texture B are 0 (step S41). If it is zero, the R, G, B values of texture A (original image) are output to the drawing destination (step S42). That is, for the processing target pixel in which all of the R, G, and B values of the texture B are 0, the R, G, and B values of the original image in FIG. 7 are set.

  If at least one of the R, G, and B values of the texture B is not zero, it is determined whether the α value (Z value) of the texture B is equal to or less than the α value (Z value) of the texture A (step S43). . If the α value of texture B is larger than the α value of texture A, the process proceeds to step S42, and the R, G, and B values of the original image are set for the processing target pixel.

  On the other hand, when the α value of the texture B is equal to or less than the α value of the texture A, the Laplacian with respect to the luminance (sum of R, G, and B values) of each pixel for the processing target pixel of the texture B and the adjacent 8 pixels A filter is applied (step S44). That is, the Laplacian filter shown in FIG. 15A is applied to perform arithmetic processing as shown in FIG. 15B, and object contour extraction processing is performed.

  Next, it is determined whether or not the processing result of step S44 is greater than zero (step S45). If it is greater than zero, it is determined that the pixel to be processed is a contour pixel, and the value obtained by rounding up the fractional part is output to the drawing destination (step S46). That is, the color information is extracted as shown in FIG. 14B, and the R, G, and B values of the outline color of the object are set as the processing target pixel. As a result, an image (texture C) in which a contour line is added to the contour of the object as shown in FIG. 12 is generated.

3. Hardware Configuration FIG. 19 shows an example of a hardware configuration capable of realizing this embodiment. The main processor 900 operates based on a program stored in a DVD 982 (information storage medium, which may be a CD), a program downloaded via the communication interface 990, a program stored in the ROM 950, or the like. Perform processing, sound processing, etc. The coprocessor 902 assists the processing of the main processor 900, and executes matrix operation (vector operation) at high speed. For example, when a matrix calculation process is required for a physical simulation for moving or moving an object, a program operating on the main processor 900 instructs (requests) the process to the coprocessor 902.

  The geometry processor 904 performs geometry processing such as coordinate conversion, perspective conversion, light source calculation, and curved surface generation based on an instruction from a program operating on the main processor 900, and executes matrix calculation at high speed. The data decompression processor 906 performs decoding processing of the compressed image data and sound data and accelerates the decoding processing of the main processor 900. Thereby, a moving image compressed by the MPEG method or the like can be displayed on the opening screen or the game screen.

  The drawing processor 910 executes drawing (rendering) processing of an object composed of primitive surfaces such as polygons and curved surfaces. When drawing an object, the main processor 900 uses the DMA controller 970 to pass the drawing data (vertex data and other parameters) to the drawing processor 910 and, if necessary, the texture to the texture storage unit 924. Forward. Then, the drawing processor 910 draws the object in the frame buffer 922 while performing hidden surface removal using a Z buffer or the like based on the drawing data and texture. The drawing processor 910 also performs α blending (translucent processing), depth cueing, mip mapping, fog processing, bilinear filtering, trilinear filtering, anti-aliasing, shading processing, and the like. Programmable shaders such as a vertex shader and a pixel shader are also mounted on the drawing processor 910. According to the shader program that realizes the method of this embodiment, the creation / change (update) of vertex data and the drawing color of pixels (or fragments) are changed. Make a decision. When an image for one frame is written in the frame buffer 922, the image is displayed on the display 912.

  The sound processor 930 includes a multi-channel ADPCM sound source and the like, generates game sounds such as BGM, sound effects, and sounds, and outputs them through the speaker 932. Data from the game controller 942 and the memory card 944 is input via the serial interface 940.

  The ROM 950 stores system programs and the like. In the case of an arcade game system, the ROM 950 functions as an information storage medium, and various programs are stored in the ROM 950. A hard disk may be used instead of the ROM 950. The RAM 960 is a work area for various processors. The DMA controller 970 controls DMA transfer between the processor and the memory. The DVD drive 980 (may be a CD drive) accesses a DVD 982 (may be a CD) in which programs, image data, sound data, and the like are stored. The communication interface 990 performs data transfer with the outside via a network (communication line, high-speed serial bus).

  The processing of each unit (each unit) in this embodiment may be realized entirely by hardware, or may be realized by a program stored in an information storage medium or a program distributed via a communication interface. Also good. Alternatively, it may be realized by both hardware and a program.

  When the processing of each part of this embodiment is realized by both hardware and a program, a program for causing the hardware (computer) to function as each part of this embodiment is stored in the information storage medium. More specifically, the program instructs the processors 902, 904, 906, 910, and 930, which are hardware, and passes data if necessary. Each processor 902, 904, 906, 910, 930 realizes the processing of each unit of the present invention based on the instruction and the passed data.

  Although the present embodiment has been described in detail as described above, it will be easily understood by those skilled in the art that many modifications can be made without departing from the novel matters and effects of the present invention. Accordingly, all such modifications are intended to be included in the scope of the present invention. For example, in the specification or the drawings, it is described at least once together with different terms (Kth component, Lth component, Mth component, first contour color, second contour color, etc.) in a broader sense or the same meaning. The terms (R component, G component, B component, green, red, etc.) can be replaced with the different terms in any part of the specification or drawings.

  Further, the contour line drawing method is not limited to the one described in the present embodiment, and methods equivalent to these are also included in the scope of the present invention. For example, the contour information image generation method, the contour extraction method, and the like are not limited to the method described in the present embodiment. In the invention of drawing contour lines of different drawing colors on objects having different attributes, the contour lines may be drawn by the first method or the second method, or the contour lines may be drawn by other methods. Good. Further, the present invention may be realized by pixel shader processing, or may be realized by other processing.

  The present invention can be applied to various games. Further, the present invention is applied to various image generation systems such as a business game system, a home game system, a large attraction system in which a large number of players participate, a simulator, a multimedia terminal, a system board for generating game images, and a mobile phone. it can.

The example of a functional block diagram of the image generation system of this embodiment. The example of the image for an outline color reference produced | generated by the 1st method. The example of the image for an outline detection produced | generated by the 1st method. The figure which visualized the outline extracted by the 1st method. The example of the final image produced | generated by the 1st method. The enlarged view of the boundary part between the objects by a 1st method. The example of the original image produced | generated by the 2nd method. The figure which visualized the Z value of the original image produced | generated by the 2nd method. The example of the outline information image produced | generated by the 2nd method. The figure which visualized the Z value of the outline information image produced | generated by the 2nd method. The figure which visualized the outline extracted by the 2nd method. The example of the final image produced | generated by the 2nd method. The enlarged view of the boundary part between the objects by a 2nd method. 14A, 14B, and 14C are explanatory diagrams of the second method. 15A, 15B, and 15C are explanatory diagrams of the second method. The example of the game screen produced | generated by this embodiment. The detailed example of the process of this embodiment. The detailed example of the process of this embodiment. Hardware configuration example.

Explanation of symbols

100 processing unit, 110 object space setting unit, 112 movement / motion processing unit,
114 virtual camera control unit, 120 image generation unit, 122 original image generation unit,
124 contour information image generation unit, 128 contour line drawing unit,
130 sound generation unit, 160 operation unit, 170 storage unit, 172 frame buffer,
174 texture storage unit, 176 Z buffer, 180 information storage medium,
190 display unit, 192 sound output unit, 194 portable information storage device, 196 communication unit

Claims (15)

A program for generating an image,
An original image generating unit for generating an original image by drawing an object;
A contour information image generating unit that draws an object with a drawing color set for each object, and generates a contour information image for contour color setting and contour detection of the object;
As an outline drawing unit that combines an image of an object outline with the original image and draws an object outline,
Make the computer work,
The outline drawing unit
A program that extracts the contour of an object based on the contour information image and draws a contour line with respect to the contour of the extracted object with the contour color set by the drawing color of the contour information image . In claim 1,
The contour information image generation unit
A program characterized in that the contour information image is generated by drawing an object using a color obtained by adjusting brightness according to the distance of the object from the viewpoint with respect to the contour color of the object as the drawing color. In claim 2,
The outline drawing unit
A program that extracts luminance information from the drawing color of the outline information image and extracts an outline of an object based on the extracted luminance information. In claim 3,
The outline drawing unit
The program which extracts the said brightness | luminance information by performing the addition process of the value of the 1st, 2nd, 3rd component of the said drawing color of the said outline information image. In any of claims 2 to 4,
The outline drawing unit
A program that extracts color information from the drawing color of the outline information image and draws an outline of an object with an outline color corresponding to the extracted color information. In any one of Claims 1 thru | or 5,
The outline drawing unit
A program that extracts luminance information from a Kth component of the drawing color of the contour information image and extracts an outline of an object based on the extracted luminance information. In any one of Claims 1 thru | or 6.
The contour information image generation unit
Drawing an object in a drawing color in which contour color designation information is set in the L-th component, generating the contour information image;
The outline drawing unit
A program that extracts contour color designation information from the Lth component of the drawing color of the contour information image and draws a contour line of an object with the contour color designated by the extracted contour color designation information . In any one of Claims 1 thru | or 7,
The outline drawing unit
If Ru high brightness der compared to one side is the other side of the contour of an object, the program characterized by rendering the one side only or contour of an object only to the other side. In any one of Claims 1 thru | or 8.
The outline drawing unit
Determining whether the pixel to be processed is a pixel of the contour line of the object based on the Z value generated when generating the original image and the Z value generated when generating the contour information image A program characterized by In any of claims 1 to 9,
The outline drawing unit
When the first object on the near side when viewed from the viewpoint and the second object on the far side when viewed from the viewpoint overlap with each other when viewed from the viewpoint, at the boundary at the overlapping portion of the first and second objects, A program for drawing only an outline of the first object. In any one of Claims 1 thru | or 10 .
The outline drawing unit
For an object belonging to the first attribute, an object outline is drawn with a first outline color, and for an object belonging to the second attribute, an object outline is drawn with a second outline color. program. In claim 11 ,
The outline drawing unit
A program for drawing an object outline in a first outline color for an object belonging to an enemy group and drawing an object outline in a second outline color for an object belonging to a group other than the enemy. In claim 11 ,
The outline drawing unit
For an object having the first type of information, the outline of the object is drawn with the first outline color, and for an object having the second type of information, the outline of the object is drawn with the second outline color. A program characterized by A computer-readable information storage medium, wherein the program according to any one of claims 1 to 13 is stored. An image generation system for generating an image,
An original image generating unit for generating an original image by drawing an object;
A contour information image generating unit that draws an object with a drawing color set for each object, and generates a contour information image for contour color setting and contour detection of the object;
An outline drawing unit that combines an image of the outline of the object with the original image and draws the outline of the object;
The outline drawing unit
An image characterized in that an outline of an object is extracted based on the outline information image, and an outline is drawn with respect to the extracted outline of the object with an outline color set by the drawing color of the outline information image. Generation system.