JP2003323633A - Image processor and image processing program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image processor for effectively applying anti-alias processing by a method wherein a sense of incompatibility is not generated in an image dependently of the direction of a point of view, and for naturally plotting a three-dimensional object. <P>SOLUTION: This image processor plots a three-dimensional object on a display picture by using image plotting data including model data and texture data. A model setting means sets a three-dimensional model in a virtual three- dimensional space based on the model data. A texture processing means applies anti-alias processing to the prescribed texture included in the texture data, and generates a processing texture including the anti-iris part and the main texture part. A plotting means plots the three-dimensional object on the display screen by mapping the plurality of textures including the processing texture to a plurality of polygons configuring the three-dimensional model. In this case, the plotting means maps the processing texture to make the boundary of the anti-alias part and main texture part of the processing texture cross another texture. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing device and a program using computer graphics technology.

[0002]

2. Description of the Related Art In computer graphics,
Objects and objects, or objects and backgrounds,
Anti-aliasing (Anti Aliasing) is used as a method for naturally drawing a straight boundary line that divides two regions.
ing) is known. Anti-aliasing is a method of assigning to a pixel forming a boundary between two adjacent areas an intermediate brightness and color of each pixel in those two areas, which causes jaggedness called jaggy. It can be prevented and the boundary between the two areas can appear natural.

[0003]

However, for example, in a three-dimensional object such as a rectangular parallelepiped, if anti-aliasing is applied to the boundaries of the surfaces forming the rectangular parallelepiped, the anti-aliasing may be different depending on the viewpoint position when the three-dimensional object is drawn. Gaps may appear to appear where aliasing is applied. For example, assume a three-dimensional object composed of two surfaces intersecting each other so that the cross section is substantially L-shaped, and anti-aliasing is applied to each of these two surfaces in the vicinity of one side where they intersect. Assume that it has been applied. In this case, if the model is drawn from a viewpoint that has an depression angle close to 45 degrees to both the two surfaces, the two surfaces appear to be continuous. However, if you draw this object from a viewpoint that is close to horizontal or vertical to one of the faces, the anti-aliased area looks like a gap, and there is a gap at the boundary between two adjacent faces. The problem that they appear discontinuous may occur.

The present invention has been made in view of the above points, and the antialiasing process is effectively performed by a method that does not cause a feeling of strangeness in an image depending on the direction of the viewpoint, and a three-dimensional object is naturally generated. An object is to provide an image processing device and a program capable of drawing.

[0005]

According to one aspect of the present invention, there is provided an image processing device for performing a process of drawing a three-dimensional object on a display screen by 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, and anti-aliasing processing for a predetermined texture included in the texture data, and including an anti-aliasing portion and a main texture portion. Rendering for rendering the three-dimensional object on the display screen by mapping texture processing means for generating a processed texture and a plurality of textures including the processed texture to a plurality of polygons forming the three-dimensional model. Means for rendering the processed texture before the processing texture. And the boundary of the anti-aliasing portion and the main texture portion, and the other texture maps the processed texture to intersect.

The above-mentioned image processing device draws a three-dimensional object on a display screen of a display device or the like using the image drawing data. The image drawing data includes model data and texture data. The model data is data that specifies 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. 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.

Drawing of a three-dimensional object is performed as follows. First, the model setting means uses the model data to set a three-dimensional model in the virtual three-dimensional space. The three-dimensional model can be set, for example, by setting the position coordinates of each polygon forming the three-dimensional model in the coordinate system of the virtual three-dimensional space. Next, the anti-aliasing processing means performs anti-aliasing processing on a predetermined texture among the plurality of textures to generate a processed texture having an anti-aliasing 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. Then, the drawing means draws a three-dimensional object by mapping a plurality of textures on a plurality of polygons forming the three-dimensional model. Here, when mapping the processed texture, the drawing means maps the processed texture so that the boundaries of the anti-aliasing part and the main texture part of the processed texture intersect with another texture. That is,
The processed texture is adjacent to another texture at the end of the main texture part, not at the end of the antialiasing part. Therefore, it is possible to prevent the problem that the anti-aliased 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.

In one aspect of the above image processing apparatus, the drawing means, when mapping two processed textures adjacent to each other, maps a boundary line between the anti-aliasing part and the main texture part of one processed texture, The two processed textures can be mapped such that the boundary line between the anti-aliasing part and the main texture part of the other one processed texture overlap.

According to this aspect, when the processed textures subjected to the antialiasing processing are mapped adjacent to each other, the end portions of the main texture portion are drawn so as to overlap each other. Therefore, in the portion of the three-dimensional object where the processed textures subjected to the antialiasing processing are mapped adjacent to each other, the end portions of the antialiasing portion are not arranged adjacent to each other. As a result, it is possible to prevent a problem that the anti-aliased portion looks like a gap, and it is possible to draw an area where the processed textures are adjacent to each other without a feeling of strangeness.

In another aspect of the above-mentioned image processing apparatus, the drawing means, when one processed texture and an unprocessed texture that has not been subjected to antialiasing processing are adjacently mapped, the one processed texture is used. The processed texture and the unprocessed texture can be mapped such that the boundary line between the anti-aliasing part and the main texture part and one side of the unprocessed texture overlap.

According to this aspect, when the anti-aliased processed texture and the non-anti-aliased unprocessed texture are adjacently mapped, the main texture portion of the processed texture and the unprocessed texture 1 The sides are drawn overlapping. Therefore, in the portion where the processed texture and the unprocessed texture are adjacently mapped in the three-dimensional object, the end of the antialiasing 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 portion looks like a gap, and it is possible to draw an area where the processed texture and the unprocessed texture are adjacent to each other without a feeling of strangeness.

In still another aspect of the above image processing apparatus, the image drawing data may further include background image data, and the anti-aliasing processing means utilizes the background image data to perform the predetermined texture. Can be antialiased. Further, in this case, the anti-aliasing processing unit can perform α blending on the pixel data forming the background image data and the pixel data forming the predetermined texture.

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, so-called jaggies or the like occur at the boundary of the processed texture. It will not be drawn unnaturally. 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.

In still another aspect of the above image processing device, the drawing means is arranged in the virtual three-dimensional space.
The texture may not be mapped to a polygon existing at a depth position that is a predetermined distance or more from the viewpoint when drawing the three-dimensional object.

At the time of drawing a three-dimensional object, an observer does not feel much difference between polygons existing at a depth position of a predetermined distance or more, whether or not they are drawn. Also, such a small texture mapped at a deep depth position may cause flickering on the drawn image when the drawn three-dimensional object is moved, so do not draw it from the aspect of image quality. Is effective. Moreover, if such a texture is not mapped, the amount of processing is reduced and the drawing speed is improved.

In another aspect of the present invention, a program executed by a computer for performing a process of drawing a three-dimensional object on a display screen by 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, anti-aliasing processing for a predetermined texture included in the texture data, and an anti-aliasing part and a main texture part. A texture processing unit that generates a processed texture including the processed texture, and a plurality of textures including the processed texture are mapped to a plurality of polygons that form the three-dimensional model to draw the three-dimensional object on the display screen. Function as a drawing means, Image means includes a boundary of the anti-aliasing portion and the main texture portion of the processing texture, and the other texture maps the processed texture to intersect.

By executing the above program by a computer, the above image processing apparatus can be realized.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below with reference to the drawings.

[Structure of Game Device] FIG. 1 is a block diagram of a control system of a home game device to which the image processing device of the present invention is applied. This home-use game machine executes a predetermined game in accordance with a game program recorded in a DVD-ROM 15 as a storage medium.

This game device has a monitor 9 and a speaker 1.
0a and 10b, controller 12, auxiliary storage device 1
3, a DVD-ROM 15, and a game machine body 16. Generally, a home-use television receiver is used for the monitor 9, and the built-in speaker of the television receiver is 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 an operation member that receives an operation by the player is provided therein.

The auxiliary storage device 13 is a storage medium for storing data relating to the game progress status and the like, and can use, for example, a semiconductor memory. DVD
The 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.

On the other hand, the game machine main body 16 includes a CPU 1 mainly composed of a microprocessor and the CPU.
ROM2 and RAM3 as main memory for 1
And GPU (Graphics Proce) for image processing and audio processing.
ssing unit) 4 and SPU (Sound Processing Unit)
6 and buffers 5, 7 for those units, D
It has a VD-ROM reader 8. The ROM 2 stores an operating system as a program necessary for controlling the operation of the game machine. A game program and data read from the DVD-ROM 15 as a storage medium are written in the RAM 3 as necessary. In the present invention, the image drawing data and the image processing program read from the DVD-ROM 15 are stored in the RAM 3.

The GPU 4 receives the image data from the CPU 1 and 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 the image drawing method described later. In the present invention, the CPU 1 and the GPU 4 operate in accordance with the image processing program stored in the DVD-ROM 15 to draw an image including a three-dimensional object.

The SPU 6 reproduces data such as voices and musical tones and sound source data read from the DVD-ROM 15 and recorded in the sound buffer 7, and outputs them from the speaker.

The DVD-ROM reading device 8 reads a program or data recorded on the DVD-ROM 15 according to an instruction from the CPU 1 and outputs a signal corresponding to the read contents.

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
Output to. The CPU 1 determines the operation state of the controller 12 based on the signal. The controller 12
A plurality of auxiliary storage devices 13 can be connected to the communication control device 11 in parallel.

[Description of Principle] Next, the principle of the 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 attaching a texture (also referred to as “mapping”) to a plurality of polygons that form a three-dimensional model. At this time, the texture to be mapped is subjected to anti-aliasing processing as needed, so that the boundary portion of a plurality of polygons forming the three-dimensional model can be naturally drawn.

FIG. 2A shows, as an example, a three-dimensional model 30 having a U-shaped cross section. This three-dimensional model 30
Is composed of three rectangular surfaces (polygons) 31 to 33.

3A to 3C, when texture is mapped to the three-dimensional model 30 shown in FIG.
An example when antialiasing is applied is shown. In addition,
In FIGS. 3A to 3C, the three-dimensional model after mapping is indicated by reference numeral 40. The three-dimensional model 40 is shown in FIG.
It is configured by mapping the three textures 41 to 43 to the three-dimensional model 30 shown in (a). FIG. 3A shows a three-dimensional model 40 with a texture 41.
2B is a perspective view of the surface of the texture 41 when viewed at an angle of depression of about 45 degrees, and FIG. 2C is a perspective view of the texture 41 as viewed from an angle of depression close to 0 degrees (that is, from a viewpoint close to horizontal).

All the three textures 41 to 43 mapped to the three-dimensional model 40 are rectangular textures, the texture 41 is yellow, the texture 42 is red,
Assume that the texture 43 is blue. Texture 4
1 has a central portion (hereinafter, referred to as "main texture portion") 41a, and side boundary portions 41b and 41c along the long side of the main texture portion 41a. Border 4
Reference numerals 1b and 41c are antialiased portions (hereinafter also referred to as "antialiasing portions"). Specifically, the boundary portions 41b and 41c are α (alpha)
The area is anti-aliased by a technique such as blending so as to have an intermediate brightness and color between the yellow color, which is the color of the texture 41, and the background color of the three-dimensional model 40.

Similarly, the texture 42 has a main texture portion 42a and anti-aliased boundary portions 42b and 42c located on the sides along the long sides of the main texture portion 42a. Borders 42b and 42
The area c is anti-aliased so as to have an intermediate brightness and color between the red color, which is the color of the texture 42, and the background color of the three-dimensional model 40. Further, the texture 43 has a main texture portion 43a and boundary portions 43b and 43c which are located on the side portions along the long side of the main texture portion 43a and which are anti-aliased. The boundary portions 43b and 43c are areas that have been subjected to anti-aliasing so as to have an intermediate brightness and color between the blue color that is the color of the texture 43 and the background color of the three-dimensional model 40.

As described above, the reason why the anti-aliasing process is applied to each of the textures 41 to 43 which form the three-dimensional model 40 is that the textures 41 and 42 and the side (ridge line) part formed by the intersection of the textures 41 and 43. This is to prevent so-called jaggies from occurring. That is, as shown schematically in FIG. 2B, if the textures 34 to 36 that are not subjected to antialiasing are mapped to polygons corresponding to the respective faces of the three-dimensional model 30 shown in FIG. The portion 38 having the side 37 formed by the intersection of the textures 34 and 35 is the enlarged portion 39.
As shown in, the pixels on the texture 34 side and the texture 3
The pixels on the 5 side are alternately interdigitated, and so-called jaggies occur. As a result, in the three-dimensional model after mapping shown in FIG. 2B, the part of the side 37 looks unnaturally jagged.

Therefore, as shown in FIG. 3A, anti-aliasing-processed boundaries 41b, 41c, 42b, 42c are applied to the textures 41-43 to be mapped on the surfaces 31-33 of the three-dimensional model 30. , 43b, 4
By providing 3c respectively, each texture 41-
It is possible to prevent the generation of jaggies at the boundary portion of 43 and smoothly draw each side.

However, as shown in FIGS. 3 (b) and 3 (c), when the three-dimensional model 40 is drawn from a viewpoint close to horizontal or vertical with respect to one of the surfaces, the anti-aliased boundary portion becomes the background. Seems to blend in with the color, and as a result,
The problem that there seems to be a gap between each texture occurs. In the example of FIG. 3B, the texture 41
Since the three-dimensional model 40 is drawn from a viewpoint nearly vertical to the
c appears to be blended into the background color, and a gap appears between the textures 41 and 42. Similarly, in the example of FIG. 3C, since the three-dimensional model 40 is drawn from the viewpoint close to the horizontal with respect to the texture 42, the boundary portion 42b subjected to the anti-aliasing process appears to be blended with the background color, and the texture 42 It looks like there is a gap between 41 and 42.

In order to prevent such a problem, according to the present invention, the adjacent textures are mapped so that the areas where the anti-aliasing processing is not performed, that is, the main texture portions intersect with each other. An example of this is shown in FIG.
It shows in (a)-(c). In FIG. 4A, the texture 41 ′ has only the main texture portion 41a, and
It does not have the boundary parts 41b and 41c like the example of (a). And the main texture part 4 of the texture 41 '
1a is mapped on the three-dimensional model 30 so as to intersect with the main texture portion 42a of the texture 42 and the main texture portion 43a of the texture 43. That is, the main texture portion 41a of the texture 41 'is
The textures 42 and 43 are mapped so as to intersect not with the ends of the anti-aliased boundaries 42b and 43b, but with the ends of the inner main textures 42a and 43b in the length direction. This allows
It is possible to prevent the appearance of a gap between the adjacent textures at the portion where the boundary portions subjected to the anti-aliasing process intersect with each other as in the example of FIGS. 3A to 3C.

4B and 4C are examples in which the three-dimensional model 40 shown in FIG. 4A is drawn from the same viewpoints as in FIGS. 3B and 3C. As can be seen by comparison with FIGS. 3B and 3C, the three-dimensional model 40 shown in FIG.
In this case, the textures 41 ', 42, 43 are not the end portions of the boundary portions 42b, 43b subjected to the anti-aliasing process, but the main texture portions 41a, 42a, 4a inside thereof
Since the textures are mapped so that the ends of 1a and 43a intersect with each other, it does not appear that a gap is created between the drawn textures of the three-dimensional model 40. Even if the textures 41 ', 42, and 43 are mapped so that the main texture portions intersect each other, the textures 42' and 43 'still have the anti-aliased boundary portions.
And 42 'and 41' and 43 do not cause jaggies or the like on the drawn image, and the texture 4
1'and 42 and 41 'and 43 are smoothly connected.

In the examples 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 such boundary portions 41b and 41c, as shown in FIG.
The texture 41 having 1b and 41c is used, and the main texture portion 41a of the texture 41 and the main texture portions 42b and 43b of the textures 42 and 43 are left with the boundaries 41b and 41c of the texture 41 left.
It is also possible to map the textures 41 to 43 so that and intersect with each other. Also in the example of FIG.
Boundaries 41b, 41c that have undergone anti-aliasing,
Textures 41-43, not the ends of 42b, 43b
Main texture parts 41a and 42a, 41a and 43a
Since the textures are mapped so that the edges of the image intersect with each other, the problem that the anti-aliased portion looks like a gap does not occur.

Further, FIGS. 4A to 4C and 5A.
Shows an example of drawing a three-dimensional object having a U-shaped cross section, but 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) formed by intersecting two surfaces,
A three-dimensional object with a triangular cross section that is formed by intersecting three faces, and a three-dimensional object that is a rectangular cross section that is formed by intersecting four faces.
The present invention can be applied to drawing of a portion where two surfaces (polygons) intersect in various three-dimensional objects such as a three-dimensional object.

[Functional Block] Next, the function of the image processing apparatus of the present invention will be described. FIG. 6 is a functional block diagram of the image processing device 50 of the present invention. As shown in FIG. 6, the image processing device 50 includes a model setting unit 51, an anti-aliasing processing unit 52, a background image generating 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.

The DVD-ROM 15 also 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 the CPU 1 and the GPU 4 shown in FIG. 1 execute the program to cause the game machine 16 shown in FIG. 1 to perform the image processing according to the present invention. It can be operated as a device.

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 6.
Including 3 and. The model data 60 is data indicating the shape of the three-dimensional model, and in the above-mentioned example, is data that specifies the shape of the three-dimensional model as shown in FIG. The texture data 62 is data of textures to be mapped to a plurality of polygons forming the three-dimensional model, and in the above-described example, the textures 41 to 4 shown in FIG.
3 data. The background image data 63 is data of a background image when drawing a three-dimensional object.

In the image processing apparatus 50 realized by executing the image processing program 65, the model setting means 51 uses the model data 61 to create a virtual three-dimensional space in FIG. Set a three-dimensional model as illustrated in. The setting of the three-dimensional model is actually performed by, for example, generating the coordinate data of the model arranged in the virtual three-dimensional space, in which case the model setting means 51 draws the coordinate data of the three-dimensional model. Supply to 54.

The anti-aliasing processing means 52 performs anti-aliasing processing on necessary ones out of the plurality of textures included in the texture data 62.
A texture including a boundary portion that has been subjected to anti-aliasing processing as illustrated in (a) is generated and supplied to the drawing unit 54. Further, the anti-aliasing processing means 52 supplies the texture data of the texture for which anti-aliasing processing is unnecessary to the drawing means 54 as it is. The background image generating means 53 generates a background image based on the background image data 63 and supplies it to the drawing means 54.

The drawing means 54 draws the background image generated by the background image generating means 53 on the monitor 9 and, for the three-dimensional model set in the virtual three-dimensional space by the model setting means 51, Map the texture. At this time, the rendering unit 54 applies both the anti-aliased texture (hereinafter also referred to as “processed texture”) and the anti-aliased texture (hereinafter also referred to as “unprocessed texture”). It can be mapped to a three-dimensional model.

Here, as described with reference to FIG. 3, the drawing means 54 maps each texture on the three-dimensional model so that the main texture parts of the textures intersect with each other. Therefore, the drawing unit 54 maps the unprocessed texture so that the outer edge of the unprocessed texture coincides with the outer edge of each polygon forming the three-dimensional model. Further, the drawing means 54 maps the processed texture so that the outer edge of the main texture portion does not coincide with the outer edge of each polygon forming the three-dimensional model, instead of the antialiasing portion. Therefore, for example, a processed texture such as the texture 42 of FIG. 4A may be mapped in a state where the anti-aliasing portion 42b extends outside each polygon forming the three-dimensional model.

As described with reference to FIGS. 3 and 4, according to the image drawing processing of the present invention, it seems that there is a gap between the textures mapped to the polygons forming the three-dimensional model. An image is prevented from being drawn in this state. Further, when the processed texture is mapped, since the anti-aliasing portion is provided, the side portion where the textures intersect can be smoothly drawn.

[Image Drawing Process] Next, the image drawing process according to the present invention will be described with reference to the flowchart of FIG. Note that this image drawing process is performed as shown in FIG.
The image processing program stored in a storage medium such as the DVD-ROM 15 is executed by the CPU 1 or the like of the game machine 16 and functions as each unit shown in FIG.

First, the background image generating means 53 is a DVD-
Background image data is acquired from a storage medium such as the ROM 15 to generate a background image, and the background image is supplied to the drawing means 54 (step S1).

Next, the model setting means 51 causes the DVD-RO
Model data is acquired from a storage medium such as M15, and a three-dimensional model is set in the virtual three-dimensional space based on the data (step S2).

Next, the anti-aliasing processing means 52
Texture data of a plurality of textures to be mapped to the three-dimensional model corresponding to the model data acquired in step S1 is acquired 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 portion (step S4).

Whether or not the antialiasing process is applied to each side of each texture can be basically determined in advance in relation to the three-dimensional model using the texture. For example, in the case of the example of FIG. 2A, the three textures 4 shown in FIG.
It is predetermined that 1 ', 42, 43 are mapped to each surface (polygon). Further, at that time, it is previously determined that the texture 41 ′ does not require anti-aliasing processing, and the textures 42 and 43 need anti-aliasing processing along their long sides. Such information can be included in advance in the model data of the three-dimensional model 30 shown in FIG. 2 or in the texture data, for example. The anti-aliasing processing means 52
The anti-aliasing process is performed on a predetermined side of a predetermined texture with reference to data indicating the necessity of such anti-aliasing process. Although various methods can be used for the anti-aliasing process itself, as an example, the anti-aliasing portion can be generated by α-blending each texture data and the background image data generated in step S1.

When the necessary antialiasing processing is completed in this way, the antialiasing processing means 52 supplies the necessary processed texture and unprocessed texture to the drawing means 54. The drawing unit 54 draws a three-dimensional object on the monitor 9 by mapping the corresponding texture to each polygon forming 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 the processed texture or the unprocessed texture. . As described above, the image of the three-dimensional object corresponding to the predetermined three-dimensional model is drawn on the monitor 9.

[Mapping process in the depth direction] Next, the mapping process in the depth direction of the 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 means 54 maps the textures T1 to Tn on each polygon as shown in FIG. 8A. An example of the 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 means 54 maps the texture of an appropriate size according to the depth of each polygon. Accordingly, 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. Note that such a method is called Mip Mapping.

The texture prepared in advance as a mapping target has transparency information in addition to the color information. This also 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 semitransparent (intermediate between opaque and transparent) is drawn according to the color information of the texture, but the brightness is reduced to half. Also,
A texture whose transparency is set to transparent does not need to be drawn regardless of how the color information is set.

By utilizing this property, the texture at a position deep in the depth direction (far from the viewpoint) has its transparency set in advance so that the texture is actually rendered when the three-dimensional object is drawn. You can choose not to draw. A texture at a sufficiently deep position in the depth direction will be drawn as a sufficiently small texture by the mip mapping process described above.
Whether or not a very small texture is drawn, there is not much difference in the entire image. In addition, depending on the color of the texture, the image may still appear to flicker as the three-dimensional object moves, even if the mip mapping process described above is performed.
Therefore, by setting the transparency of all the textures to be mapped to the depth position of a predetermined distance or more in the depth direction to be transparent, the drawing of such textures can be omitted.

When actually drawing a three-dimensional object, transparency and color information are preset for each texture corresponding to a plurality of polygons forming the three-dimensional object, and the drawing means described above is based on these. 54 draws each texture. However, by setting the transparency of the texture positioned at a depth equal to or greater than the predetermined distance to be transparent in advance, the process of drawing the texture becomes unnecessary. Therefore, the amount of processing required when drawing a three-dimensional object can be reduced accordingly, and drawing can be performed quickly.

[0057]

As described above, according to the present invention,
When drawing a 3D object by mapping multiple textures to a 3D model, the textures are mapped so that the main texture parts intersect each other instead of the antialiasing part of each texture. It is possible to prevent a problem that a gap appears between textures depending on the direction of the viewpoint when drawing. This makes it possible to draw a three-dimensional object naturally without any discomfort.

[Brief description of drawings]

FIG. 1 is a block diagram of a control system of a home-use game machine 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 antialiasing parts intersect with each other with respect to the three-dimensional model shown in FIG.

FIG. 4 shows an example in which textures are mapped to the three-dimensional model shown in FIG. 2 so that main texture portions intersect with each other according to the image processing of the present invention.

FIG. 5 shows another example in which textures are mapped according to the image drawing processing 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 an image drawing process 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 monitors 15 DVD-ROM 16 Game console body 50 image processing device

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yoshitaka Kinoshita             4-23, Shiba 4-chome, Minato-ku, Tokyo             Nami Computer Entertainment Studio             Within Geo F-term (reference) 2C001 BA05 BA06 BC05 BC08 CA01                       CB01 CB04 CB06 CC02                 5B080 AA13 CA01 FA03 FA14 GA22

Claims (12)

[Claims] 1. An image processing device for performing a process of drawing a three-dimensional object on a display screen by using image drawing data including model data and texture data, wherein a virtual 3D object is created based on the model data. Model setting means for setting a three-dimensional model in a three-dimensional space; texture processing means for performing anti-aliasing processing on a predetermined texture included in the texture data to generate a processed texture including an anti-aliasing part and a main texture part; A plurality of textures including the processed texture are
Drawing means for drawing the three-dimensional object on the display screen by mapping the polygons forming a three-dimensional model, the drawing means comprising the anti-aliasing part and the main texture part of the processed texture. An image processing apparatus, wherein the processed texture is mapped so that the boundary of the and the other texture intersect. 2. The mapping means, when mapping two processed textures adjacent to each other, maps the boundary line between the anti-aliasing part and the main texture part of one processed texture, and the boundary line of another one of the processed textures. The image processing apparatus according to claim 1, wherein the two processed textures are mapped so that a boundary line between the anti-aliasing portion and the main texture portion overlaps with each other. 3. The rendering means, when mapping one processed texture and an unprocessed texture that has not been subjected to antialiasing processing adjacently, maps the antialiased part and the main texture part of the one processed texture. Borders and one of the raw textures
The image processing apparatus according to claim 1 or 2, wherein the processed texture and the unprocessed texture are mapped so that the sides thereof overlap. 4. The image drawing data further includes background image data, and the anti-aliasing processing unit uses the background image data to perform anti-aliasing processing on the predetermined texture. The image processing device according to any one of 1 to 3. 5. The image processing apparatus according to claim 4, wherein the anti-aliasing processing unit performs α blending on the pixel data forming the background image data and the pixel data forming the predetermined texture. 6. The drawing means does not map the texture to a polygon existing in a depth position of a predetermined distance or more from a viewpoint when the three-dimensional object is drawn in the virtual three-dimensional space. The image processing apparatus according to any one of claims 1 to 5, characterized in that the image processing apparatus comprises: 7. A program executed by a computer for performing processing of drawing a three-dimensional object on a display screen by 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, processed texture including an anti-aliasing part and a main texture part for anti-aliasing a predetermined texture included in the texture data. A texture processing unit for generating a plurality of textures including the processed texture,
The three-dimensional object is made to function as a drawing unit that draws on the display screen by mapping the polygons that form a three-dimensional model. A program that maps the processing texture so that the boundary and another texture intersect. 8. The drawing means, when mapping two processed textures adjacent to each other, a boundary line between the antialiasing part and the main texture part of one processed texture, and the boundary line of another one of the processed textures. The program according to claim 7, wherein the two processed textures are mapped so that a boundary line between the anti-aliasing portion and the main texture portion overlaps with each other. 9. The rendering means, when mapping one processed texture and an unprocessed texture that has not been subjected to antialiasing processing adjacently, maps the antialiased part and the main texture part of the one processed texture. Borders and one of the raw textures
The program according to claim 7 or 8, wherein the processed texture and the unprocessed texture are mapped so that the edges overlap each other. 10. The image drawing data further includes background image data, and the anti-aliasing processing means performs anti-aliasing processing on the predetermined texture using the background image data. 10. The program according to any one of 7 to 9. 11. The program according to claim 10, wherein the anti-aliasing processing unit performs α blending on the pixel data forming the background image data and the pixel data forming the predetermined texture. 12. The drawing means does not map the texture to a polygon existing in 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 claims 7 to 11, which is characterized.