JP3579680B2 - Image processing apparatus and program - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an image processing apparatus and program using computer graphics technology.
[0002]
[Prior art]
In computer graphics, anti-aliasing is known as a method for naturally drawing a linear boundary line that divides two regions, such as an object and an object, or an object and a background. . Anti-aliasing is a technique that assigns the brightness and color between the pixels of two adjacent areas to the pixels that constitute the boundary between two adjacent areas, thereby reducing the occurrence of jaggedness called jaggy. And the natural boundary between the two areas can be seen.
[0003]
[Problems to be solved by the invention]
However, for example, when anti-aliasing is applied to the boundary of each surface constituting a rectangular parallelepiped in a three-dimensional object such as a rectangular parallelepiped, a gap is generated in the portion to which anti-aliasing is applied depending on the viewpoint position when drawing the three-dimensional object. It may look like For example, assuming a three-dimensional object composed of two surfaces that intersect each other so that the cross section is substantially L-shaped, anti-aliasing processing is performed in the vicinity of one side where the two surfaces intersect each other. Assume that it has been applied. In this case, when this model is drawn from a viewpoint having a depression angle close to 45 degrees with respect to both of the two surfaces, the two surfaces appear to be continuous. However, when this object is drawn from a viewpoint that is almost horizontal or vertical with respect to one of the faces, the area to which anti-aliasing is applied looks like a gap, and a gap is created at the boundary between two adjacent faces. The problem of appearing discontinuous can arise.
[0004]
The present invention has been made in view of the above points, and effectively renders a three-dimensional object by effectively performing anti-aliasing processing in such a manner that the image does not feel strange depending on the direction of the viewpoint. An object of the present invention is to provide an image processing apparatus and a program capable of performing the above.
[0005]
[Means for Solving the Problems]
In one aspect of the present invention, an image processing apparatus that performs processing for drawing a three-dimensional object on a display screen using image drawing data including model data and texture data is based on the model data. Model setting means for setting a three-dimensional model in a three-dimensional space; and texture processing means for applying a anti-aliasing process to a predetermined texture included in the texture data and generating a processing texture including an anti-aliasing part and a main texture part; Drawing means for drawing the three-dimensional object on the display screen by mapping a plurality of textures including the processing texture to a plurality of polygons constituting the three-dimensional model, Are the anti-aliasing part and the main part of the processed texture. And the boundary of the texture portion, and the other texture maps the processed texture to intersect.
[0006]
The image processing apparatus draws a three-dimensional object on a display screen such as a display device using image drawing data. The image drawing data includes model data and texture data. The model data is data for specifying a model of a three-dimensional object (that is, a three-dimensional model), and can be data such as coordinates in a virtual three-dimensional space, for example. The three-dimensional model is composed of a plurality of polygons, and the texture data includes a plurality of textures to be mapped to each polygon.
[0007]
Drawing of a three-dimensional object is performed as follows. First, the model setting means sets a 3D model in the virtual 3D space using the model data. The setting of the three-dimensional model can be performed, for example, by setting the position coordinates of each polygon constituting the three-dimensional model in the coordinate system of the virtual three-dimensional space. Next, the antialiasing processing unit performs antialiasing processing on a predetermined texture among the plurality of textures to generate a processed texture having an antialiasing portion and a main texture portion. The anti-aliasing part is a part generated by the anti-aliasing process, and the main texture part is a part corresponding to the original texture before the anti-aliasing process. The drawing means draws a three-dimensional object by mapping a plurality of textures to a plurality of polygons constituting the three-dimensional model. Here, when mapping the processing texture, the drawing unit maps the processing texture so that the boundary between the anti-aliasing part and the main texture part of the processing texture intersects with another texture. That is, the processed texture is adjacent to another texture not at the end of the anti-aliasing part but at the end of the main texture part. Therefore, it is possible to prevent a problem that the anti-aliasing portion looks like a gap on the drawn image due to the movement of the viewpoint when drawing the three-dimensional object. This makes it possible to draw a three-dimensional object naturally.
[0008]
In one aspect of the image processing apparatus, when the drawing unit maps two processing textures adjacent to each other, a boundary line between the anti-aliasing part and the main texture part of one processing texture, and another one The two processed textures can be mapped so that the boundary line between the anti-alias part and the main texture part of the two processed textures overlaps.
[0009]
According to this aspect, when the processed textures subjected to the anti-aliasing process are mapped adjacent to each other, the ends of the main texture part are drawn overlapping each other. Therefore, in the portion where the processed textures subjected to anti-aliasing processing are adjacently mapped in the three-dimensional object, the end portions of the anti-aliasing portion are not adjacently arranged. As a result, it is possible to prevent a problem that the anti-aliasing part looks like a gap, and it is possible to draw a region where the processing textures are adjacent to each other without a sense of incompatibility.
[0010]
In another aspect of the above image processing apparatus, when the drawing unit maps one processed texture and an unprocessed texture that has not been subjected to anti-aliasing adjacent to each other, the anti-aliasing of the one processed texture is performed. The processed texture and the unprocessed texture can be mapped so that a boundary line between the image processing unit and the main texture unit overlaps one side of the unprocessed texture.
[0011]
According to this aspect, when the processed texture subjected to the anti-aliasing process and the unprocessed texture not subjected to the anti-aliasing process are mapped adjacent to each other, the main texture portion of the processed texture and one side of the unprocessed texture are Overlapped drawing. Therefore, in the part where the processed texture and the unprocessed texture are mapped adjacently in the three-dimensional object, the end of the anti-aliasing part and the end of the unprocessed texture are not arranged so as to overlap each other. As a result, it is possible to prevent a problem that the anti-aliasing part looks like a gap, and it is possible to draw a region where the processed texture and the unprocessed texture are adjacent to each other without a sense of incongruity.
[0012]
In still another aspect of the image processing device, the image drawing data may further include background image data, and the anti-aliasing processing unit applies the background image data to the predetermined texture. Anti-aliasing can be applied. In this case, the anti-aliasing processing unit can α blend the pixel data constituting the background image data and the pixel data constituting the predetermined texture.
[0013]
According to this aspect, since the anti-aliasing unit is generated by, for example, α blending the pixel data of the original texture and the pixel data of the background image, a so-called jaggy or the like is generated at the boundary of the processing texture. It is not drawn naturally. Note that α blending is a method of combining two images at a predetermined ratio (α), and is used in translucent processing or the like.
[0014]
In still another aspect of the image processing apparatus, the drawing unit applies a polygon in a depth position equal to or greater than a predetermined distance from a viewpoint when the three-dimensional object is drawn in the virtual three-dimensional space. May not map the texture.
[0015]
When drawing a three-dimensional object, an observer does not feel a great difference whether or not a polygon existing at a depth position greater than a predetermined distance is drawn. In addition, such a small texture mapped to a deep depth position may cause flickering on the drawn image when moving the drawn three-dimensional object, so do not draw from the aspect of image quality. Is effective. Further, if such a texture is not mapped, the processing corresponding to that is reduced, and the drawing speed is also improved.
[0016]
In another aspect of the present invention, there is provided a program executed by a computer for performing processing for drawing a three-dimensional object on a display screen using image drawing data including model data and texture data. A model setting unit for setting a three-dimensional model in a virtual three-dimensional space based on the model data; a process including an anti-aliasing unit and a main texture unit that performs an anti-aliasing process on a predetermined texture included in the texture data Texture processing means for generating texture, and drawing means for drawing the three-dimensional object on the display screen by mapping a plurality of textures including the processed texture to a plurality of polygons constituting the three-dimensional model The drawing means And the boundary of the anti-aliasing portion and the main texture of serial processing textures, and the other texture maps the processed texture to intersect.
[0017]
The above-described image processing apparatus can be realized by executing the above program by a computer.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Preferred embodiments of the present invention will be described below with reference to the drawings.
[0019]
[Configuration of game device]
FIG. 1 is a block diagram of a control system of a consumer game device to which the image processing apparatus of the present invention is applied. This home game device executes a predetermined game in accordance with a game program recorded on a DVD-ROM 15 as a storage medium.
[0020]
This game device includes a monitor 9, speakers 10a and 10b, a controller 12, an auxiliary storage device 13, a DVD-ROM 15, and a game machine body 16. A home television receiver is generally used for the monitor 9, and a built-in speaker of the television receiver is generally used for the speakers 10a and 10b. The speaker has two channels, a right channel speaker 10a and a left channel speaker 10b. The controller 12 functions as an input device, and is provided with an operation member that receives an operation by the player.
[0021]
The auxiliary storage device 13 is a storage medium for storing data related to game progress and the like, and for example, a semiconductor memory can be used. The DVD-ROM 15 stores image drawing data and an image processing program necessary for executing the image processing of the present invention, and details thereof will be described later. Note that various storage media such as a CD-ROM and a semiconductor memory may be used instead of the DVD-ROM 15.
[0022]
On the other hand, the game machine main body 16 includes a CPU 1 mainly composed of a microprocessor, a ROM 2 and a RAM 3 as main storages for the CPU 1, a GPU (Graphics Processing Unit) 4 for image processing and sound processing, and a SPU (Sound). (Processing Unit) 6, buffers 5 and 7 for those units, and a DVD-ROM reader 8. The ROM 2 stores an operating system as a program necessary for operation control of the game machine. In the RAM 3, a game program and data read from a DVD-ROM 15 as a storage medium are written as necessary. In the present invention, image drawing data and image processing programs read from the DVD-ROM 15 are stored in the RAM 3.
[0023]
The GPU 4 receives image data from the CPU 1, draws a game image on the video memory 5, converts the drawn image data into a predetermined video reproduction signal, and outputs it to the monitor 9 at a predetermined timing. This game image can include a three-dimensional object drawn by an image drawing method described later. In the present invention, the CPU 1 and the GPU 4 operate according to the image processing program stored in the DVD-ROM 15 to draw an image including a three-dimensional object.
[0024]
The SPU 6 reproduces data such as voice and musical sound and sound source data read from the DVD-ROM 15 and recorded in the sound buffer 7 and outputs them from the speaker.
[0025]
The DVD-ROM reader 8 reads a program or data recorded on the DVD-ROM 15 in accordance with an instruction from the CPU 1 and outputs a signal corresponding to the read content.
[0026]
Note that a communication control device 11 is connected to the CPU 1 via a bus 14, and a controller 12 and an auxiliary storage device 13 are detachably connected to the device 11. The communication control device 11 scans the operation state of the operation member of the controller 12 at a constant cycle (for example, 1/60 seconds), and outputs a signal corresponding to the scan result to the CPU 1. The CPU 1 determines the operation state of the controller 12 based on the signal. A plurality of controllers 12 and auxiliary storage devices 13 can be connected to the communication control device 11 in parallel.
[0027]
[Principle explanation]
Next, the principle of image drawing processing according to the present invention will be described. In the image drawing processing of the present invention, a three-dimensional object is drawn by pasting a texture (also referred to as “mapping”) to a plurality of polygons constituting a three-dimensional model. At that time, by performing anti-aliasing processing on the texture to be mapped as necessary, it becomes possible to naturally draw the boundary portions of a plurality of polygons constituting the three-dimensional model.
[0028]
FIG. 2A shows a three-dimensional model 30 having a U-shaped cross section as an example. The three-dimensional model 30 includes three surfaces (polygons) 31 to 33 each having a rectangular shape.
[0029]
FIGS. 3A to 3C show examples when antialiasing is performed when texture is mapped to the three-dimensional model 30 shown in FIG. 3A to 3C, the three-dimensional model after mapping is indicated by reference numeral 40. The three-dimensional model 40 is configured by mapping three textures 41 to 43 to the three-dimensional model 30 shown in FIG. FIG. 3A is a perspective view when the three-dimensional model 40 is viewed at a depression angle of about 45 degrees with respect to the surface of the texture 41, and FIG. 2B is 90 degrees with respect to the surface of the texture 41. FIG. 2C is a perspective view when viewed from a close depression angle (that is, from a viewpoint close to vertical), and FIG. 2C is a view from a depression angle close to 0 degrees with respect to the surface of the texture 41 (that is, from a viewpoint close to horizontal). FIG.
[0030]
It is assumed that the three textures 41 to 43 mapped to the three-dimensional model 40 are all rectangular textures, the texture 41 is yellow, the texture 42 is red, and the texture 43 is blue. The texture 41 has a central portion (hereinafter referred to as “main texture portion”) 41 a and side boundary portions 41 b and 41 c along the long side of the main texture portion 41 a. The boundary portions 41b and 41c are portions subjected to anti-aliasing processing (hereinafter also referred to as “anti-aliasing portions”). Specifically, the boundary portions 41 b and 41 c have brightness and color intermediate between the yellow color that is the color of the texture 41 and the background color of the three-dimensional model 40 by a method such as α (alpha) blending. This is an anti-aliased area.
[0031]
Similarly, the texture 42 has a main texture portion 42a and boundary portions 42b and 42c that are located on the side portions along the long side of the main texture portion 42a and have been subjected to anti-aliasing. The boundary portions 42 b and 42 c are regions that have been subjected to anti-aliasing so as to have a brightness and color intermediate between the red color that is the color of the texture 42 and the background color of the three-dimensional model 40. The texture 43 includes a main texture portion 43a and boundary portions 43b and 43c that are located on the side portions along the long side of the main texture portion 43a and have been subjected to anti-aliasing. The boundary portions 43 b and 43 c are regions that have been subjected to anti-aliasing so as to have brightness and color intermediate between the blue color that is the color of the texture 43 and the background color of the three-dimensional model 40.
[0032]
As described above, the reason why the anti-aliasing process is performed on each of the textures 41 to 43 constituting the three-dimensional model 40 is that the textures 41 and 42 and the so-called jaggy on the side (ridge line) formed by the intersection of the textures 41 and 43. This is to prevent the occurrence of. That is, as schematically shown in FIG. 2B, if the textures 34 to 36 that are not subjected to anti-aliasing are mapped to polygons corresponding to each surface of the three-dimensional model 30 shown in FIG. A portion 38 having a side 37 formed by the intersection of the textures 34 and 35 has a shape in which pixels on the texture 34 side and pixels on the texture 35 side are alternately arranged as shown in the enlarged portion 39, and so-called jaggy is generated. . As a result, in the three-dimensional model after mapping shown in FIG. 2B, the side 37 portion appears unnaturally jagged.
[0033]
Therefore, as shown in FIG. 3A, boundary portions 41 b, 41 c, 42 b, 42 c, 43 b, which have been subjected to anti-aliasing processing on the textures 41 to 43 mapped to the respective surfaces 31 to 33 of the three-dimensional model 30, By providing 43c, it is possible to prevent the occurrence of jaggies at the boundaries between the textures 41 to 43 and draw each side smoothly.
[0034]
However, as shown in FIGS. 3B and 3C, when the three-dimensional model 40 is drawn from a horizontal or vertical viewpoint with respect to any surface, the antialiased boundary portion melts into the background color. As a result, there is a problem that a gap appears between the textures. In the example of FIG. 3B, since the three-dimensional model 40 is drawn from a viewpoint that is nearly perpendicular to the texture 41, the anti-aliased boundary portion 41c appears to melt into the background color, and the textures 41 and 42 appear. It seems that there is a gap between them. Similarly, in the example of FIG. 3C, since the three-dimensional model 40 is drawn from a viewpoint that is almost horizontal with respect to the texture 42, the boundary portion 42b subjected to the anti-aliasing process appears to be melted into the background color. It appears that there is a gap between 41 and 42.
[0035]
In order to prevent such inconvenience, in the present invention, adjacent textures are mapped so that regions not subjected to anti-aliasing processing, that is, main texture portions intersect each other. An example of this is shown in FIGS. In FIG. 4A, the texture 41 ′ has only the main texture portion 41a, and does not have the boundary portions 41b and 41c as in the example of FIG. The main texture portion 41 a of the texture 41 ′ is mapped on the three-dimensional model 30 so as to intersect with the main texture portion 42 a of the texture 42 and the main texture portion 43 a of the texture 43. That is, the main texture portion 41a of the texture 41 'is not the end portions of the boundary portions 42b and 43b subjected to the anti-aliasing processing of the textures 42 and 43, but each of the main texture portions 42a and 43b in the length direction thereof. It is mapped so as to cross the end. Thereby, it can be prevented that there is a gap between adjacent textures at a portion where the boundary portions subjected to the anti-aliasing process intersect as in the examples of FIGS.
[0036]
FIGS. 4B and 4C are examples in which the three-dimensional model 40 shown in FIG. 4A is drawn from the same viewpoint as FIGS. 3B and 3C. As can be seen from comparison with FIGS. 3B and 3C, in the case of the three-dimensional model 40 shown in FIG. 4, the textures 41 ′, 42, and 43 are the edges of the boundary portions 42b and 43b that have undergone anti-aliasing. Since the textures are mapped so that the ends of the main texture portions 41a and 42a and 41a and 43a inside each other intersect with each other, there is a gap between the rendered three-dimensional model 40 textures. Don't look like. Further, even if the textures 41 ′, 42, and 43 are mapped so that the main texture portions intersect with each other, the textures 42 ′ and 43 have a boundary portion subjected to anti-aliasing processing. , 41 ′ and 43 are not in contact with each other, and the texture 41 ′ and 42, 41 ′ and 43 are smoothly connected on the rendered image.
[0037]
In the example of FIGS. 4A to 4C, the texture 41 ′ has only the main texture portion 41a and does not have the boundary portions 41b and 41c. Instead of the texture 41 ′ having no boundary portions 41b and 41c, the texture 41 having the boundary portions 41b and 41c is used as shown in FIG. 5A, and the boundary portions 41b and 41c of the texture 41 are changed. It is also possible to map the textures 41 to 43 so that the main texture portion 41a of the texture 41 and the main texture portions 42b and 43b of the textures 42 and 43 intersect with each other. In the example of FIG. 5A as well, the end portions of the main texture portions 41a and 42a and the end portions of 41a and 43a of the textures 41 to 43 are not mutually connected instead of the end portions of the boundary portions 41b, 41c, 42b, and 43b subjected to the anti-aliasing process. Since the textures are mapped so as to cross each other, there is no problem that the anti-aliased portion looks like a gap.
[0038]
4A to 4C and FIG. 5A illustrate an example of drawing a three-dimensional object having a U-shaped cross section, the application of the present invention is not limited to this. That is, a three-dimensional object having an L-shaped cross section or a V-shaped cross section (see FIG. 5B) configured by crossing two surfaces, a three-dimensional object having a triangular cross section configured by crossing three surfaces, 4 The present invention can be applied to a drawing of a portion where two surfaces (polygons) intersect in various three-dimensional objects such as a three-dimensional object having a rectangular cross section formed by intersecting two surfaces.
[0039]
[Function block]
Next, functions of the image processing apparatus of the present invention will be described. FIG. 6 is a functional block diagram of the image processing apparatus 50 of the present invention. As shown in FIG. 6, the image processing apparatus 50 includes a model setting unit 51, an anti-aliasing processing unit 52, a background image generation unit 53, and a drawing unit 54. The image processing device 50 is connected to the monitor 9 and draws an image of a three-dimensional object on the monitor 9.
[0040]
The DVD-ROM 15 stores image drawing data 60 and an image processing program 65. The image processing program 65 is a program for executing the image drawing processing according to the present invention, and is executed by the CPU 1 or the GPU 4 shown in FIG. 1, thereby causing the game machine 16 shown in FIG. It can be operated as a device.
[0041]
The image drawing data 60 is data used when drawing an image on the monitor 9, and includes model data 61, texture data 62, and background image data 63. The model data 60 is data indicating the shape of the three-dimensional model. In the above example, the model data 60 is data specifying the shape of the three-dimensional model as shown in FIG. The texture data 62 is texture data to be mapped to a plurality of polygons constituting the three-dimensional model. In the above example, the texture data 62 is data of the textures 41 to 43 shown in FIG. The background image data 63 is data of a background image when drawing a three-dimensional object.
[0042]
In the image processing apparatus 50 realized by executing the image processing program 65, the model setting unit 51 uses the model data 61 to illustrate in a virtual three-dimensional space as shown in FIG. Such a three-dimensional model is set. The setting of the three-dimensional model is actually performed by, for example, generating coordinate data of a model arranged in a virtual three-dimensional space. In this case, the model setting unit 51 draws the coordinate data of the three-dimensional model. 54.
[0043]
The anti-aliasing processing unit 52 performs anti-aliasing processing on necessary ones of a plurality of textures included in the texture data 62, and includes a texture including a boundary portion subjected to anti-aliasing processing as illustrated in FIG. Is generated and supplied to the drawing means 54. Further, the anti-aliasing processing unit 52 supplies texture data of a texture that does not require anti-aliasing processing to the drawing unit 54 as it is. The background image generation unit 53 generates a background image based on the background image data 63 and supplies the background image to the drawing unit 54.
[0044]
The drawing unit 54 draws the background image generated by the background image generation unit 53 on the monitor 9 and maps the texture to the three-dimensional model set in the virtual three-dimensional space by the model setting unit 51. To do. At this time, the drawing unit 54 uses both an anti-aliased texture (hereinafter also referred to as “processed texture”) and an anti-aliased texture (hereinafter also referred to as “unprocessed texture”). Mapping can be performed for a three-dimensional model.
[0045]
Here, as described with reference to FIG. 3, the drawing unit 54 maps each texture on the three-dimensional model so that the main texture portions of each texture intersect. Therefore, the drawing unit 54 maps the unprocessed texture so that the outer edge matches the outer edge of each polygon constituting the three-dimensional model. Further, the drawing unit 54 maps the processed texture so that the outer edge of the main texture part is not the anti-alias part, but the outer edge of each polygon constituting the three-dimensional model. Therefore, for example, a processing texture such as the texture 42 in FIG. 4A may be mapped in a state in which the antialiasing unit 42b extends to the outside of each polygon constituting the three-dimensional model.
[0046]
As described with reference to FIGS. 3 and 4, according to the image drawing processing of the present invention, the image is displayed in a state where there is a gap between the textures mapped to the polygons constituting the three-dimensional model. Is prevented from being drawn. In addition, when the processing texture is mapped, since the anti-aliasing portion is provided, the side portion where the textures intersect can be drawn smoothly.
[0047]
[Image drawing processing]
Next, image drawing processing according to the present invention will be described with reference to the flowchart of FIG. In this image drawing process, as shown in FIG. 6, the CPU 1 of the game machine 16 executes an image processing program stored in a storage medium such as a DVD-ROM 15 and functions as each unit shown in FIG. Is realized.
[0048]
First, the background image generation unit 53 acquires background image data from a storage medium such as the DVD-ROM 15, generates a background image, and supplies the background image to the drawing unit 54 (step S1).
[0049]
Next, the model setting means 51 acquires model data from a storage medium such as the DVD-ROM 15, and sets a three-dimensional model in the virtual three-dimensional space based on the model data (step S2).
[0050]
Next, the anti-aliasing processing unit 52 acquires texture data of a plurality of textures to be mapped to the three-dimensional model corresponding to the model data acquired in step S1 from the DVD-ROM 15 (step S3). Then, the anti-aliasing processing unit 52 performs anti-aliasing processing on the acquired plurality of textures as necessary to generate a processed texture having an anti-aliasing part (step S4).
[0051]
Whether or not to perform anti-aliasing for each side of each texture can be determined in advance in relation to the three-dimensional model that uses the texture. For example, in the case of the example of FIG. 2A, for the three-dimensional model 30, it is predetermined that the three textures 41 ′, 42, and 43 shown in FIG. ing. At this time, it is also determined in advance that the texture 41 ′ does not need anti-aliasing, and that the textures 42 and 43 need anti-aliasing along their long sides. Such information can be included in advance, for example, in the model data of the three-dimensional model 30 shown in FIG. 2 or in the texture data. The anti-aliasing processing unit 52 refers to data indicating the necessity of such anti-aliasing processing and performs anti-aliasing processing on a predetermined side of a predetermined texture. Various methods can be used for the anti-aliasing process itself. As an example, an anti-aliasing part can be generated by α-blending each texture data and the background image data generated in step S1.
[0052]
Thus, when the necessary anti-aliasing processing is completed, the anti-aliasing processing means 52 supplies the necessary processing texture and unprocessed texture to the drawing means 54. The drawing means 54 draws a three-dimensional object on the monitor 9 by mapping the corresponding texture to each polygon constituting the three-dimensional model set in the virtual three-dimensional space (step S5). At this time, as described above, the drawing unit 54 maps each texture on the polygon so that the main texture portion of the processed texture and the outer edge of the unprocessed texture intersect each other regardless of whether the texture is processed texture or unprocessed texture. . As described above, an image of a three-dimensional object corresponding to a predetermined three-dimensional model is drawn on the monitor 9.
[0053]
[Mapping process in depth direction]
Next, mapping processing in the depth direction of a three-dimensional object viewed from a certain viewpoint will be described. For example, it is assumed that the three-dimensional model 30 illustrated in FIG. 2 is sufficiently long in the depth direction of the display image as illustrated in FIG. In this case, the surface 32 of the three-dimensional model 30 is composed of a plurality of polygons, and the drawing unit 54 maps the textures T1 to Tn to each polygon as shown in FIG. 8A. An example of individual textures T1 to Tn is shown in FIG. A plurality of textures having different integer multiples are prepared in advance according to the size of the polygon, and the drawing unit 54 maps a texture having an appropriate size according to the depth of each polygon. Thereby, when the three-dimensional object is moved on the display image, it is possible to prevent the texture located at the back of the screen from flickering. Such a method is referred to as “Mip Mapping”.
[0054]
Textures prepared in advance as mapping targets have transparency information in addition to their color information. The same applies to mip mapping. The texture whose transparency is set to opaque is drawn on the monitor 9 according to the color information of the texture. A texture whose transparency is set to semi-transparent (between opaque and transparent) is drawn according to the color information of the texture, but is drawn so that the brightness is halved. In addition, a texture whose transparency is set to be transparent does not need to be drawn regardless of how the color information is set.
[0055]
By using this property, textures that are deep in the depth direction (far from the viewpoint) are not drawn when the 3D object is drawn by setting the transparency to transparent in advance. Can be. Textures that are deep enough in the depth direction will be drawn as sufficiently small textures by the mip mapping process described above, but there is not much difference as a whole image even if not very small textures are drawn. Does not occur. Also, depending on the color of the texture, the image may still appear to flicker with the movement of the three-dimensional object even if the mip mapping process described above is performed. Therefore, drawing of such textures can be omitted by setting the transparency of all textures to be mapped to depth positions that are equal to or greater than a predetermined distance in the depth direction.
[0056]
When actually drawing a three-dimensional object, transparency and color information are set in advance for each texture corresponding to a plurality of polygons constituting the three-dimensional object. Draw a texture. However, if the transparency of a texture located at a depth of a predetermined distance or more is set to be transparent in advance, the process of drawing the texture becomes unnecessary. Therefore, it is possible to reduce the amount of processing required when drawing a three-dimensional object and to perform drawing quickly.
[0057]
【The invention's effect】
As described above, according to the present invention, when a plurality of textures are mapped to a three-dimensional model and a three-dimensional object is drawn, the main texture portions intersect with each other instead of the anti-aliasing portion of each texture. Since the textures are mapped to each other, it is possible to prevent a problem that a gap appears between the textures depending on the direction of the viewpoint when the three-dimensional object is drawn. Thereby, it becomes possible to draw a three-dimensional object naturally without a sense of incongruity.
[Brief description of the drawings]
FIG. 1 is a block diagram of a control system of a consumer game device to which the present invention is applied.
FIG. 2 shows an example of a three-dimensional model.
FIG. 3 shows an example in which textures are mapped so that anti-aliasing parts intersect with the three-dimensional model shown in FIG. 2;
4 shows an example in which textures are mapped on the three-dimensional model shown in FIG. 2 so that main texture portions intersect each other according to the image processing of the present invention.
FIG. 5 shows another example in which a texture is mapped in accordance with the image drawing process of the present invention.
FIG. 6 shows functional blocks of an image processing apparatus according to the present invention.
FIG. 7 is a flowchart showing image drawing processing by the image processing apparatus according to the present invention.
FIG. 8 is a diagram illustrating a mapping processing method in a depth direction of a display image.
[Explanation of symbols]
1 CPU
2 ROM
3 RAM
4 GPU
5 Video memory
6 SPU
7 Sound buffer
8 DVD-ROM reader
9 Monitor
15 DVD-ROM
16 Game console
50 Image processing device

Claims (12)

An image processing apparatus that performs processing for drawing a three-dimensional object on a display screen using image drawing data including model data and texture data,
Model setting means for setting a three-dimensional model in a virtual three-dimensional space based on the model data;
Texture processing means for performing anti-aliasing processing on a predetermined texture included in the texture data and generating a processing texture including an anti-aliasing portion and a main texture portion;
Drawing means for drawing the three-dimensional object on the display screen by mapping a plurality of textures including the processing texture to a plurality of polygons constituting the three-dimensional model;
The image processing apparatus, wherein the drawing unit maps the processing texture so that a boundary between the anti-aliasing part and the main texture part of the processing texture intersects with another texture. In the case where the two processing textures are mapped adjacent to each other, the drawing unit maps a boundary line between the anti-aliasing part and the main texture part of one processing texture, and the anti-aliasing part and the main of another processing texture. The image processing apparatus according to claim 1, wherein the two processing textures are mapped so that a boundary line with the texture portion overlaps. When the drawing unit maps one processed texture and an unprocessed texture that has not been subjected to anti-aliasing processing adjacent to each other, a boundary line between the anti-aliasing portion and the main texture portion of the one processing texture; The image processing apparatus according to claim 1, wherein the processed texture and the unprocessed texture are mapped so that one side of the unprocessed texture overlaps. The image drawing data further includes background image data,
The image processing apparatus according to claim 1, wherein the anti-aliasing processing unit performs anti-aliasing processing on the predetermined texture using the background image data. The image processing apparatus according to claim 4, wherein the anti-aliasing processing unit performs α blending on pixel data constituting the background image data and pixel data constituting the predetermined texture. The drawing means does not map the texture to a polygon existing at a depth position of a predetermined distance or more from a viewpoint when drawing the three-dimensional object in the virtual three-dimensional space. The image processing apparatus according to any one of 1 to 5. A program that is executed by a computer and performs processing for drawing a three-dimensional object on a display screen using image drawing data including model data and texture data, the computer comprising:
Model setting means for setting a three-dimensional model in a virtual three-dimensional space based on the model data;
A texture processing means for performing anti-aliasing processing on a predetermined texture included in the texture data, and generating a processing texture including an anti-aliasing portion and a main texture portion;
A plurality of textures including the processing texture are mapped to a plurality of polygons constituting the three-dimensional model to function as a drawing unit that draws the three-dimensional object on the display screen;
The drawing unit maps the processing texture so that a boundary between the anti-aliasing part and the main texture part of the processing texture intersects with another texture. In the case where the two processing textures are mapped adjacent to each other, the drawing unit maps a boundary line between the anti-aliasing part and the main texture part of one processing texture, and the anti-aliasing part and the main of another processing texture. 8. The program according to claim 7, wherein the two processing textures are mapped so that a boundary line with the texture portion overlaps. When the drawing unit maps one processed texture and an unprocessed texture that has not been subjected to anti-aliasing processing adjacent to each other, a boundary line between the anti-aliasing portion and the main texture portion of the one processing texture; The program according to claim 7 or 8, wherein the processed texture and the unprocessed texture are mapped so that one side of the unprocessed texture overlaps. The image drawing data further includes background image data,
The program according to claim 7, wherein the anti-aliasing processing unit performs anti-aliasing processing on the predetermined texture using the background image data. The program according to claim 10, wherein the anti-aliasing processing unit α blends the pixel data constituting the background image data and the pixel data constituting the predetermined texture. The drawing means does not map the texture to a polygon existing at a depth position of a predetermined distance or more from a viewpoint when drawing the three-dimensional object in the virtual three-dimensional space. The program according to any one of 7 to 11.

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