JP4231684B2 - GAME DEVICE AND GAME PROGRAM - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a game device and a game program. Translucent object The present invention relates to a game device and a game program that simultaneously display the screen on the screen.
[0002]
[Prior art]
The game device displays a game screen on which various ideas are applied in order to attract the player's interest. As one of such devices, a method of displaying a game screen using a blending object is known. A blending object is an object that is displayed by mixing or adding colors to the overlapping portion when it overlaps with an object in the depth direction of the screen.
[0003]
Patent Document 1 discloses a game device that displays a plurality of translucent objects, which are a kind of blending object, on a screen at the same time. This game apparatus draws opaque polygons and then draws translucent objects arranged in the depth direction in order from the back to the front. Patent Document 2 discloses a method of drawing only one shadow object in an area where shadow objects overlap when drawing a plurality of shadow objects. In this method, it is determined for each pixel whether or not a shadow object has already been drawn using the most significant bit of the α value (the blending ratio of blending objects) stored in the frame buffer. Thereby, it is possible to prevent shadow objects from being overwritten.
[0004]
[Patent Document 1]
JP 10-11610 A
[Patent Document 2]
JP 2001-188917 A
[0005]
[Problems to be solved by the invention]
The game apparatus may perform a process of expressing one object as a whole by simultaneously displaying a plurality of blending objects of the same type on the screen. For example, when a game device expresses a gas such as smoke or a liquid such as water, it generates a large number of smoke and water unit objects (also referred to as particle objects), and smoke and water are generated by the collection of the unit objects. May be expressed.
[0006]
When a plurality of blending objects are displayed on the screen at the same time, if the blending objects overlap each other, the color of the overlapped portion becomes darker or brighter. More specifically, when displaying blending objects, when mixing objects and colors in the depth direction of the screen, the color of the overlapped part becomes darker, and when adding objects and colors in the depth direction of the screen The color of the overlapping part becomes brighter.
[0007]
However, the game device disclosed in Patent Document 1 does not perform special processing even when semi-transparent objects overlap. For this reason, even if an attempt is made to express one object as a whole using a plurality of blending objects, the color of the overlapping part of the blending objects becomes darker or brighter, so that it cannot be seen as one object. For example, as shown in FIG. 9, even if smoke unit objects 91a to 91g showing a part of smoke are displayed on the screen at the same time, the color of the part where the smoke unit objects overlap becomes darker or brighter. The player does not feel that the group of smoke unit objects 91a to 91g is a unitary smoke.
[0008]
Further, in the method disclosed in Patent Document 2, it is determined whether or not a shadow object has already been written using the most significant bit of the α value stored in the frame buffer. For this reason, this method has a problem that it cannot cope with a case where there are a plurality of types of blending objects. For example, when there are blending object A and blending object B and the most significant bit of the α value of the frame buffer is 1, blending object A or blending object B is already written. I do not know. For this reason, even if the blending object A has already been written, the blending object B is not rendered for that pixel, and the overlapping portion of the blending object A and the blending object B is mixed or added. If this is desired, the method disclosed in Patent Document 2 cannot be adopted. Also, if the number of bits used is increased, it can be used for a plurality of blending objects, but the number of bits that can be used in the frame buffer has a certain limitation. Further, even if another memory is used without using the frame buffer, the number of bits corresponding to the number of types of blending objects is required, and a large memory area must be secured.
[0009]
Therefore, the present invention provides a plurality of Translucent object Can be used to display objects that are recognized as a unit, and Translucent object An object of the present invention is to provide a game apparatus and a game program that can cope with a plurality of types of games.
[0010]
[Means for Solving the Problems and Effects of the Invention]
In order to achieve the above object, the present invention is configured as follows.
According to the first aspect of the present invention, the game device (the combination of the game machine main body 1, the controller 2, the DVD-ROM 3 and the external memory card 4 is shown in correspondence with the embodiment. In the following, similarly, a correspondence relationship with the embodiment is shown in parentheses, but the present invention is not limited to this. CPU 10 that executes S205; hereinafter, only the step number is shown), blending means (S207 to S208), and display control means (S107). The composite object generation means can include a plurality of the same type Translucent object A composite object (smoke image) is generated by drawing (smoke part object) while performing hidden surface removal by the Z buffer method. The blending unit blends the composite object generated by the composite object generation unit with respect to the overlapping portion with the background image or another object. The display control means displays the blending result by the blending means on the screen.
[0011]
According to the second aspect of the present invention, the game device includes a display memory (display memory 43) and a compositing processing memory (drawing color buffer 33 and drawing Z that are secured separately from the display memory). A buffer 34). Further, the composite object generation means (S203) Translucent object A (smoke unit object) is drawn on the synthesis processing memory while performing hidden surface removal by the Z buffer method, thereby generating a synthesized object (smoke image). The blending means (S207 to S208) reads the composite object generated on the composite processing memory, blends the overlapping portion with the background image or another object, and writes it to the display memory.
[0012]
According to the third aspect of the present invention, the game apparatus further includes a save memory (a save color buffer 41 and a save Z buffer 42) for saving the composite object generated on the composite processing memory. The blending means reads the composite object saved in the save memory, blends the background image or an overlapping portion with another object, and writes it in the display memory (display memory 43).
According to the first to third aspects of the present invention, a plurality of the same type Translucent object Because there is no color mixing or addition processing for overlapping parts, Translucent object Can be seen as a single composite object. Also, some kind of Translucent object Different kind of gathering Translucent object Can be mixed on one screen, and mixing and addition processing can be performed on those overlapping portions. For example, when expressing a gas object such as smoke, a liquid object such as water, or an object such as lava, it becomes a unit object. Translucent object It is possible to express a collection of smoke, water, lava, etc. Further, for example, when smoke (a collection of smoke unit objects) overlaps water (a collection of water unit objects), the overlapping portion can be blended to provide a realistic expression.
[0013]
According to the invention of claim 4 Bu The lending means (S207) mixes the composite object (smoke image) generated by the composite object generation means at a predetermined ratio with respect to the overlapping portion with the background image or other objects.
According to the invention of claim 4 If The same effect as Claim 1 can be produced.
[0014]
According to the fifth aspect of the present invention, the composite object generating means (S203) stores the color information and depth information of the composite object generated when drawing while performing hidden surface removal by the Z buffer method. The blending means (S207) performs hidden surface removal with the background image or other objects using the Z buffer method based on the depth information of the composite object.
[0015]
According to the invention described in claim 6, the synthesized object generating means (S203) includes a plurality of Translucent object Is stored in the compositing processing memory (the drawing color buffer 33 and the drawing Z buffer 34) with the color information and depth information of the composite object generated when drawing while performing hidden surface removal by the Z buffer method. The blending means (S207) writes into the display memory (display memory 43) while performing hidden surface removal with the background image or other objects using the Z buffer method based on the depth information of the composite object. .
According to the invention described in claim 5 or 6, the depth information of the composite object is compared with the depth information of the other object included in the background image, thereby obtaining the context of the composite object and the other object, Hidden surface removal is performed. Therefore, the portion of the composite object that is behind the other objects is hidden on the screen.
[0016]
According to the seventh aspect of the present invention, a plurality of synthesized object generating means (S201 to S205) Translucent object The color information of the synthesized object (smoke image) generated when drawing the (smoke unit object) while performing hidden surface removal by the Z buffer method is taken out as texture data, and a predetermined plate shape facing the texture data to the screen A composite object is displayed on the screen by pasting it onto a polygon.
According to the seventh aspect of the present invention, texture data generally used for three-dimensional image processing can be used.
[0017]
According to the eighth aspect of the present invention, the composite object generating means (S201 to S205) is capable of displaying all the same types displayed on the screen at the same time. Translucent object A composite object (smoke image) is generated by drawing (smoke unit object) while performing hidden surface removal by the Z-buffer method.
According to invention of Claim 8, it is the same kind. Translucent object Can all look like a unitary object.
[0018]
According to the invention described in claim 9, the synthesized object generating means (S201) includes a plurality of Translucent object The display position of (smoke unit object) is changed separately with the passage of time.
According to invention of Claim 9, the object which moves like smoke can be expressed. Also, each Translucent object Move separately, the shape and position of the composite object (for example, the shape and position of the smoke) can be variously changed.
[0019]
According to the invention described in claim 10, when the game state satisfies a certain condition, the synthesized object generating means (S201 to S205) Translucent object (Smoke unit object) is generated near a predetermined point.
According to the invention of claim 10, when the state of the game satisfies a certain condition, Translucent object By collecting and displaying the game, it is possible to enhance the game effect.
[0020]
According to the invention of claim 11, Translucent object (Smoke unit object) is an object in which a predetermined texture (smoke pattern) is pasted on a plate-like polygon.
According to the invention of claim 11, each Translucent object Is expressed using plate-like polygons, Translucent object Are less likely to overlap. For this reason, Translucent object The flickering of the screen that occurs in the overlapping area can be suppressed. Further, by using plate-like polygons, the data storage amount and data processing amount can be reduced.
[0021]
According to the invention of claim 12, Translucent object Is always controlled to face the screen.
According to the invention of claim 12, each Translucent object Can be further reduced.
[0022]
According to the invention of claim 13, the game image is generated by the toon shading method.
According to the invention of claim 13, Translucent object Even when the images overlap, it can be avoided that the color of the overlapped portion becomes darker or brighter. When adopting the toon shading method, the entire game screen will be an image representation like cel animation, Translucent object Needs to be in cel animation style. According to the thirteenth aspect of the present invention, this demand can be met.
[0023]
According to the invention of claim 14, Translucent object Has a plurality of types.
According to the invention described in claim 14, a certain kind of Translucent object Different kind of gathering Translucent object Can be mixed on one screen, and mixing and addition processing can be performed on those overlapping portions.
[0024]
According to the invention described in claim 15, the game program is a game device (a combination of the game machine body 1, the controller 2, the DVD-ROM 3, and the external memory card 4. The external memory card 4 is selectively used. Is a game program to be executed, and includes a composite object generation step (S201 to S205), a blending step (S207 to S208), and a display control step (S107). The composite object generation step can include multiple Translucent object A composite object (smoke image) is generated by drawing (smoke part object) while performing hidden surface removal by the Z buffer method. In the blending step, the composite object generated in the composite object generation step is blended with respect to the overlapping portion with the background image or another object. In the display control step, the blending result of the blending step is displayed on the screen.
[0025]
According to the sixteenth aspect of the present invention, the game apparatus includes a display memory (display memory 43) and a composition processing memory (drawing color buffer 33 and drawing Z that are secured separately from the display memory). A buffer 34). The composite object generation step (S203) includes a plurality of the same type Translucent object A composite object (smoke image) is generated by drawing (smoke unit object) on the composite processing memory while performing hidden surface removal by the Z buffer method. In the blending steps (S207 to S208), the composite object generated on the composite processing memory is read out, and the overlapping portion with the background image or another object is blended and written into the display memory.
[0026]
According to the seventeenth aspect of the present invention, the game device further includes a save memory (a save color buffer 41 and a save Z buffer 42) for saving the synthesized object generated on the synthesis processing memory. In the blending step, the composite object saved in the save memory is read out, blended with respect to a background image or an overlapping portion with another object, and written into the display memory (display memory 43).
According to invention of Claim 15 thru | or 17, several of the same kind Translucent object Because there is no color mixing or addition processing for overlapping parts, Translucent object Can be seen as a single composite object. Also, some kind of Translucent object Different kind of gathering Translucent object Can be mixed on one screen, and mixing and addition processing can be performed on those overlapping portions.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is an external view of a game system including a game device according to an embodiment of the present invention. The game system shown in FIG. 1 includes a game machine main body 1, a controller 2, a DVD-ROM 3, an external memory card 4, and a television 5. In the embodiment described below, a portion excluding the television 5 corresponds to a game device. The external memory card 4 is adopted as necessary.
[0028]
The DVD-ROM 3 and the external memory card 4 are configured to be detachable from the game machine body 1. The controller 2 and the television 5 are each connected to the game machine body 1 by a communication cable. The game machine body 1 has a plurality of connectors for connecting the controller 2, and the controller 2 is connected to one of these connectors. Communication between the game machine main body 1 and the controller 2 may be performed wirelessly without using a communication cable.
[0029]
The DVD-ROM 3 fixedly stores data necessary for playing a game, such as a game program and image data. When the player plays a game, the DVD-ROM 3 is attached to the game machine body 1. The external memory card 4 is composed of a rewritable storage medium. In order to save the state during the game, various data during the game is recorded in the external memory card 4. In order to store a game program or the like, another storage medium may be used instead of the DVD-ROM 3.
[0030]
The game machine body 1 reads the game program recorded on the DVD-ROM 3 and executes game processing. The controller 2 is an input device of the game device. The controller 2 has a plurality of operation switches such as a joystick 6, an A button 7, a B button 8, and a start button 9, and outputs an operation input to the game machine main body 1 in response to pressing of the switch by the player. The television 5 displays the video signal output from the game machine body 1 on the screen. The television 5 has a built-in speaker. The audio signal output from the game machine body 1 is output from the speaker of the television 5.
[0031]
FIG. 2 is a block diagram showing a hardware configuration of the game apparatus shown in FIG. As shown in FIG. 2, the game machine body 1 includes a calculation unit (CPU 10, graphics processing unit (GPU) 11 and digital signal processor (DSP) 13), a storage unit (main memory 12 and sub memory 14), Various interface (I / F) units (20 to 23 and 25), a memory controller 15, and a DVD drive 24 are provided. As shown in FIG. 2, the memory controller 15 connects the arithmetic unit, the storage unit, and the interface unit to each other, and controls data transfer between these components.
[0032]
The DVD drive 24 drives the DVD-ROM 3 attached to the game machine body 1. The DVD-ROM 3 stores game programs and the like. The game program recorded on the DVD-ROM 3 is loaded into the main memory 12 via the DVD disk I / F 25 and the memory controller 15. The CPU 10 executes a game program loaded on the main memory 12. During the game, the player operates the joystick 6 of the controller 2 or presses the A button 7. The controller 2 outputs an operation input to the game machine body 1 in accordance with the operations of these players. The operation input output from the controller 2 is input to the CPU 10 via the controller I / F 20 and the memory controller 15. The CPU 10 executes a predetermined game process in response to an operation input input from the controller 2.
[0033]
The GPU 11 mainly performs image data generation processing in accordance with control from the CPU 10. The GPU 11 includes a geometry unit 31, a rendering unit 32, a drawing color buffer 33, and a drawing Z buffer 34. The drawing color buffer 33 and the drawing Z buffer 34 may be provided outside the GPU 11 or inside the main memory 12 so as to be accessible from the GPU 11. The geometry unit 31 determines the position of the object in the three-dimensional virtual space (the position in the game space, given by three-dimensional coordinates), and the rendering unit 32 is based on the three-dimensional coordinates calculated by the geometry unit 31. Then, a two-dimensional image to be displayed on the television 5 is generated. The drawing color buffer 33 stores color information of the two-dimensional image generated by the rendering unit 32, and the drawing Z buffer 34 stores depth information used in three-dimensional computer graphics.
[0034]
The main memory 12 includes a save color buffer 41, a save Z buffer 42, and a display memory 43. The save color buffer 41 temporarily stores color information of the two-dimensional image generated by the rendering unit 32, and the save Z buffer 42 temporarily stores depth information used in three-dimensional computer graphics. To do. The display memory 43 stores screen data displayed on the television 5. In addition to the above, the main memory 12 stores a game program and data necessary for executing the game program. Image data generated by the operations of the CPU 10 and the GPU 11 is finally written in the display memory 43. The image data written in the display memory 43 is read at a predetermined timing, and is output to the television 5 via the memory controller 15 and the video I / F 21. Thereby, the game screen is displayed on the television 5.
[0035]
The DSP 13 mainly performs audio data generation processing in accordance with control from the CPU 10. The sub memory 14 is a working memory for the DSP 13. The audio data generated by the DSP 13 is output to the speaker 5 b of the television 5 via the memory controller 15 and the audio I / F 23. Note that the audio signal output from the game machine body 1 may be output to a speaker different from the television 5.
[0036]
Below, the case where the game device which concerns on this embodiment performs the game program which performs the smoke display process which displays smoke on a game screen on fixed conditions is demonstrated. The game program for performing the smoke display process is fixedly recorded on the DVD-ROM 3. The game machine body 1 reads out and executes the game program recorded on the DVD-ROM 3 on the main memory 12, changes the game state according to the operation input input from the controller 2, and changes the game state based on the game state. Display the screen.
[0037]
FIG. 3 is a main flowchart of the game process including the smoke display process. The process shown in FIG. 3 is mainly executed by the CPU 10. Many parts of the screen generation process are executed by the GPU 11 controlled by the CPU 10. First, the CPU 10 initializes the game state (step S101). That is, the CPU 10 performs processing for initializing data necessary for game execution. At this time, the coordinate data of the object arranged in the three-dimensional virtual space is also initialized. Thereafter, the CPU 10 repeatedly executes the processes of steps S102 to S107 until it is determined in step S108 that the game process is to be ended.
[0038]
CPU10 receives the operation input input using the controller 2 (step S102), and changes the state of a game based on the received operation input (step S103). In step S103, the coordinate data of the object arranged in the three-dimensional virtual space is changed. Next, the CPU 10 determines whether or not to display smoke on the screen based on the game state (step S104). When it is determined that smoke is displayed on the screen, the CPU 10 executes a screen generation process with smoke (step S105), and otherwise executes a screen generation process without smoke (step S106). Next, the CPU 10 displays the generated screen on the television 5 (step S107). Next, the CPU 10 determines whether or not to end the game process (step S108). If the CPU 10 determines to end the game processing, the CPU 10 ends the game processing, and otherwise proceeds to step S102.
[0039]
When the CPU 10 executes the screen generation process with smoke, a smoke image 51 as shown in FIG. 4A is displayed on the game screen. Since smoke is a gas in the real world, the smoke image 51 is displayed translucently on the game screen in order to make the game screen realistic. That is, the smoke image 51 is combined with a background image of the game and displayed at a predetermined ratio.
[0040]
In order to display the smoke image 51 on the game screen, the game device uses an object 52 (hereinafter referred to as a smoke unit object) corresponding to a part of the smoke shown in FIG. The smoke unit object 52 is an object composed of four triangles 53a to 53d, and a texture 54 indicating a smoke pattern is pasted on the surface thereof. The game device generates a smoke image 51 shown in FIG. 4A by drawing a plurality of smoke unit objects 52 while shifting the display position little by little. The four triangles 53a to 53d are on the same plane. That is, the smoke unit object 52 is a plate-like object.
[0041]
The smoke unit object is an example of a blending object displayed by mixing or combining colors with an object in the depth direction of the screen. For this reason, the same processing as the screen generation processing with smoke shown below can be applied to other blending objects. Examples of blending objects displayed on the game screen include, in addition to smoke, shadows, water, clouds, fog, light rays, lava, and the like. In addition, the smokeless screen generation process executed by the game device according to the present embodiment does not have a feature unique to the present invention, and thus the description thereof is omitted here.
[0042]
The game apparatus sets an object, a camera, and a projection plane in the three-dimensional virtual space, and displays an image when the object is projected from the camera onto the projection plane as a game screen. The smoke unit object is always arranged to face the screen. That is, as shown in FIG. 5, the game device controls so that the normal direction of the smoke unit object 61 and the direction of the perpendicular drawn from the camera 62 to the projection plane 63 always coincide.
[0043]
The details of the process of generating a smoke image and compositing it on the screen will be described below. FIG. 6 is a block diagram in which portions related to the generation and synthesis processing of the smoke image are extracted from the block diagram shown in FIG. As shown in FIG. 6, the smoke image generation and composition processing is performed by the CPU 10, the GPU 11, and the main memory 12. As described above, the GPU 11 includes the geometry unit 31, the rendering unit 32, the drawing color buffer 33, and the drawing Z buffer 34. The main memory 12 includes the saving color buffer 41, the saving Z buffer 42, and The display memory 43 is included. In the smoke image generation and composition processing, image data is written in the order of T1 to T6 shown in FIG.
[0044]
In the present embodiment, the drawing color buffer 33 and the drawing Z buffer 34 are provided inside the GPU 11, and the save color buffer 41, the save Z buffer 42 and the display memory 43 are provided inside the main memory 12. However, in which memory these buffers are provided is a matter of design, and the present invention is not limited to the configuration shown in FIG.
[0045]
FIG. 7 is a flowchart of smoke image generation and composition processing. The process shown in FIG. 7 is executed in the screen display process with smoke (step S105 in FIG. 3). First, the CPU 10 moves each smoke unit object individually (step S201). More specifically, the CPU 10 determines the position of each smoke unit object separately so that the smoke image that is the result of combining the smoke unit objects looks like smoke on the game screen. For example, if each smoke unit object is moved upward so that the smoke rises upward, or if the wind is set to blow in the game world, each smoke unit object is moved so that the smoke flows in that wind. Move it.
[0046]
Next, the CPU 10 selects a smoke unit object to be processed (step S202). That is, the CPU 10 selects an unprocessed smoke unit object from the smoke unit objects to be displayed on the screen. The process may be performed for all smoke unit objects existing in the game world. However, it is determined whether or not the smoke unit object is in the display area of the game screen, and the process is performed only for the smoke unit object in the display area. You may do it.
[0047]
Next, the CPU 10 draws the smoke unit object selected in step S202 in the drawing buffer while performing hidden surface removal by the Z buffer method (step S203, T1 in FIG. 6). The color information of the smoke unit object is written in the drawing color buffer 33, and the depth information of the smoke unit object is written in the drawing Z buffer 34. In step S203, the smoke unit object is treated as an opaque object, and hidden surface removal is performed by the Z buffer method. For this reason, when multiple smoke unit objects overlap, the smoke unit object that is closest to the overlapping part is included in the final image, and the other smoke unit objects are the smoke unit objects that are closest to the front. Hidden.
[0048]
Next, the CPU 10 determines whether or not all smoke unit objects have been processed (step S204). When all the smoke unit objects have been processed, the CPU 10 proceeds to step S205, and otherwise proceeds to step S202.
[0049]
When the CPU 10 reaches step S205, the color information of the smoke image (for example, the smoke image 51 shown in FIG. 4A), which is a composite object, is written in the drawing color buffer 33, and the drawing is performed. In the Z buffer 34, smoke image depth information is written. The CPU 10 writes the smoke image stored in the drawing buffer in this way in the save buffer provided in the main memory 12 (step S205, T2 in FIG. 6). The smoke image color information stored in the drawing color buffer 33 is written in the evacuation color buffer 41. Further, the depth information of the smoke image stored in the drawing Z buffer 34 is written in the evacuation Z buffer 42. This saving process is performed so that the previously generated smoke image is not overwritten when the GPU 11 generates a background image of the game or an image of another object (an opaque object or another transparent object). It is. In the following description, the background image and images of other objects are collectively referred to as “background image etc.”.
[0050]
Further, if two color buffers and two Z buffers are secured in the memory in the GPU, the save buffer is not necessary, the color information of the smoke image stored in the color buffer in the GPU, the Z buffer, and so on. It is not necessary to save the depth information of the smoke image stored in the.
[0051]
Next, the CPU 10 draws an object (opaque object) other than the smoke unit object in the drawing buffer while performing hidden surface removal by the Z buffer method according to the state of the game (step S206, T3 in FIG. 6). Thereby, a background image of the game is generated. The color information of the opaque object is written in the drawing color buffer 33, and the depth information of the opaque object is written in the drawing Z buffer 34.
[0052]
Next, the CPU 10 reads the smoke image saved in step S205 from the save buffer, and blends (mixes or adds) the background image of the game stored in the drawing buffer (step S207, T4 in FIG. 6). . At this time, the CPU 10 treats the smoke image as a semi-transparent object and blends the smoke image with a background image of the game at a predetermined rate. Further, when blending the smoke image with the background image of the game, the CPU 10 performs hidden surface removal by the Z buffer method using the depth information of the composite object stored in the saving Z buffer. As a result, a portion of the smoke image that is behind the other object (opaque object) is hidden by the opaque object. Through the above processing, screen data obtained as a result of blending the smoke image with the background image of the game or the like is obtained.
[0053]
If two color buffers and two Z buffers are secured in the memory inside the GPU 11, the color information and depth information of the smoke image generated in the memory inside the GPU 11 are used as they are, and the background of the game Processing for blending images or the like may be performed.
[0054]
Next, the CPU 10 writes the blending result stored in the drawing color buffer 33 into the display memory 43 (step S208, T5 in FIG. 6). This blending result is displayed on the television 5 by a screen display process (step S107 in FIG. 3) performed later (T6 in FIG. 6). When there are a plurality of blending objects, the game device repeats the processes of S201 to S208.
[0055]
Further, the smoke unit object is not necessarily a plate-like object, and may have a quadrangular pyramid shape, for example, as shown in FIG. In the smoke unit object 56 shown in FIG. 8, the vertex E is located outside the plane S on a straight line that passes through the intersection of the diagonal lines of the rectangle ABCD and is perpendicular to the plane S. In this case, since the vertex E is not on the plane S, the smoke unit object 56 is not a plate-like object. It is also possible to generate a smoke image using such a smoke unit object. Further, even when the smoke unit object is a plate-like object, it is not necessary to be composed of four triangular polygons as shown in FIG. 4B, and any number of polygons may be formed (for example, 1).
[0056]
As described above, the game device according to the present embodiment generates a composite object by drawing a plurality of blending objects of the same type while performing hidden surface removal by the Z buffer method, and generates a background image of the game. Generate a synthesized object with the background image and display it on the screen. The game device also includes a display memory and a save memory. The generated composite object is temporarily saved in the save memory, and the result of combining the saved composite object with the background image is written in the display memory for display. The synthesis result written in the memory is displayed on the screen.
[0057]
Thereby, a collection of a plurality of blending objects can be shown as one composite object. For example, when expressing a gas object such as smoke, a liquid object such as water, or an object such as lava, a collection of smoke, water, lava, etc. is expressed by generating many blending objects as unit objects. be able to.
[Brief description of the drawings]
FIG. 1 is an external view of a game system including a game device according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a hardware configuration of the game device according to the embodiment of the present invention.
FIG. 3 is a main flowchart of the game device according to the embodiment of the present invention.
FIG. 4 is a diagram showing smoke images and smoke unit objects used in the game device according to the embodiment of the present invention.
FIG. 5 is a diagram illustrating a state in which a smoke unit object faces a screen in the game device according to the embodiment of the present invention.
FIG. 6 is a diagram illustrating a hardware configuration of a part of the game device according to the embodiment of the present invention.
FIG. 7 is a flowchart of smoke image generation and composition processing of the game device according to the embodiment of the present invention.
FIG. 8 is a diagram showing another smoke unit object used in the game device according to the embodiment of the present invention.
FIG. 9 is a diagram illustrating a state in which different colors are displayed in a portion where smoke unit objects overlap each other.
[Explanation of symbols]
1 ... Game console
10 ... CPU
11 ... GPU
33 ... Color buffer for drawing
34 ... Z buffer for drawing
41 ... color buffer for evacuation
42 ... Z buffer for evacuation
43 ... Memory for display
51 ... Smoke image
52, 56, 61 ... Smoke unit object
62 ... Camera

Claims (17)

A composite object generating means for generating a composite object by drawing a plurality of translucent objects of the same type while performing hidden surface removal by the Z buffer method;
Blending means for blending the composite object generated by the composite object generation means with respect to an overlapping portion with a background image or another object;
A game apparatus comprising: display control means for displaying a blending result by the blending means on the screen. A display memory and a synthesis processing memory secured separately from the display memory;
The composite object generation means generates a composite object by drawing a plurality of semi-transparent objects of the same type on the composite processing memory while performing hidden surface removal by the Z buffer method,
2. The blending unit reads a composite object generated on the composite processing memory, blends a background image or an overlapping portion with another object, and writes the blended image in the display memory. The game device described in 1. A save memory for saving the synthesized object generated on the synthesis processing memory;
The blending unit reads the composite object saved in the save memory, blends a background image or an overlapping portion with another object, and writes the blended object in the display memory. Game device.   2. The game apparatus according to claim 1, wherein the blending unit mixes the synthesized object generated by the synthesized object generating unit at a predetermined ratio with respect to a background image or an overlapping portion with another object. The composite object generation means stores color information and depth information of a composite object generated when drawing while performing hidden surface removal by the Z buffer method,
2. The game apparatus according to claim 1, wherein the blending means performs hidden surface erasure with a background image or another object using a Z buffer method based on the depth information of the composite object. . The composite object generating means stores color information and depth information of a composite object generated when rendering a plurality of semi-transparent objects while performing hidden surface removal by the Z buffer method in the composite processing memory,
The blending means writes to the display memory while performing hidden surface removal with a background image or another object using a Z buffer method based on the depth information of the composite object. The game device according to claim 2. Color information of a composite object generated when drawing a plurality of translucent objects while performing hidden surface removal by the Z buffer method by the composite object generation means is extracted as texture data, and the texture data is directly opposed to the screen. The game apparatus according to claim 6, wherein the composite object is displayed on the screen by being pasted on a plate-shaped polygon. The synthesized object generating means generates a synthesized object by drawing all the same type of translucent objects displayed simultaneously on the screen while performing hidden surface removal by the Z buffer method, The game device according to claim 1. The game apparatus according to claim 1, wherein the synthesized object generating unit changes the display positions of the plurality of translucent objects separately with the passage of time. 2. The game apparatus according to claim 1, wherein the synthesized object generating unit generates the plurality of translucent objects near a predetermined point when a game state satisfies a certain condition. The game apparatus according to claim 1, wherein the translucent object is an object in which a predetermined texture is pasted on a plate-shaped polygon. The game apparatus according to claim 11, wherein the translucent object is controlled so as to always face the screen.   The game apparatus according to claim 1, wherein a game image is generated by a toon shading method. The game apparatus according to claim 1, wherein there are a plurality of types of semi-transparent objects . A game program executed by a game device,
A composite object generation step of generating a composite object by drawing a plurality of semi-transparent objects of the same type while performing hidden surface removal by the Z buffer method;
A blending step of blending the composite object generated in the composite object generation step with respect to a background image or an overlapping portion with another object;
A game program, comprising: a display control step for displaying a blending result in the blending step on the screen. The game device includes a display memory and a composition processing memory secured separately from the display memory,
The composite object generation step generates a composite object by drawing a plurality of semi-transparent objects of the same type on the composite processing memory while performing hidden surface removal by the Z buffer method,
16. The blending step reads a composite object generated on the composite processing memory, blends a background image or an overlapping portion with another object, and writes the blended image in the display memory. The game program described in. The game device further includes a save memory for saving a synthesized object generated on the synthesis processing memory,
The blending step reads the composite object saved in the save memory, blends a background image or an overlapping portion with another object, and writes the blended object in the display memory. Game program.

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