JP2004158032A - Drawing processing program to be executed by computer, recording medium with the program recorded thereon, program execution device, drawing device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To display an object which may be hidden behind another object or the like in a visible state without using processing for determining positional relation or translucent processing. <P>SOLUTION: The inside of a frame F in which a two-dimensional image is formed is divided into meshes M, a prescribed range E in which a desired object is to be drawn is determined in the frame F and the Z value of a Z buffer is cleared in each mesh Mc at every other dot (every other mesh) out of the meshes M in the prescribed range E. Thereby, when the desired object is drawn in the prescribed range E later, an image of the desired object is overwritten on the mesh Mc from which the Z value is cleared even when the desired object is interrupted by an object B when looked from a viewpoint. <P>COPYRIGHT: (C)2004,JPO

Description

  The present invention relates to a drawing processing program for causing a computer to draw an image on a two-dimensional screen such as a television monitor device, a computer-readable recording medium storing a drawing processing program for causing a computer to execute, The present invention relates to a program execution device, a drawing device, and a method for executing a drawing processing program.

  2. Description of the Related Art Recent video game machines and personal computers have been highly integrated with processors and memories, have been increased in speed, and the like. As a result, for example, a three-dimensional image having a sense of presence and a sense of depth is generated in real time. It is possible to draw on a three-dimensional monitor screen.

  When rendering a three-dimensional image to be displayed on the two-dimensional monitor screen, for example, geometry (geometry) processing such as coordinate conversion processing, clipping processing, and lighting processing for three-dimensional polygon data is performed. Is performed, and data obtained as a result of the processing is subjected to perspective projection conversion processing.

  When a three-dimensional image is drawn on a two-dimensional monitor screen, for example, as shown in FIG. 8, there is an object A in a visual field (frame F) from a virtual viewpoint, and the object A and the virtual object When another object B exists between the virtual viewpoint and the viewpoint, the image in the state viewed from the virtual viewpoint is an image in which the object B partially blocks the object A.

  In a case where the positional relationship is such that the object B exists between the virtual viewpoint and the object A as in this example, in order to make the object A visible from the virtual viewpoint, for example, FIG. As shown, the object B may be rendered translucent. That is, if the object B is rendered translucent, the object A can be seen through the translucent object B in the overlapping portion ab of the object B and the object A.

  In the case of drawing an image as in the example of FIG. 9 in the conventional drawing apparatus, first, as a first process, whether or not another object (object or the like) exists between the virtual viewpoint and the object A Is determined in advance. In the first processing, it is recognized that the object B exists in the example of FIG. Next, as a second process, the object B is rendered translucent.

  By performing the first and second processes, the conventional drawing apparatus performs the object A from the virtual viewpoint even if the positional relationship is such that the object B exists between the virtual viewpoint and the object A. The image is drawn so that can be seen.

  However, in order to execute the determination processing such as the first processing described above, an extremely large amount of arithmetic processing such as calculation of the distance between the virtual viewpoint and each of the objects A and B is required, and as a result, a long processing time is required. It has become. Therefore, for example, in an application in which a three-dimensional moving image composed of an enormous number of objects is drawn in real time, the processing cannot be completed in time, and the image may break down.

  Note that if a CPU (central processing unit) capable of ultra-high-speed arithmetic processing is mounted on the drawing apparatus, the time for the above-described determination processing can be reduced. However, a CPU capable of the ultra-high-speed arithmetic processing is expensive. However, there is a disadvantage that the cost of the drawing apparatus is increased.

  The semi-transparency processing of the second processing is generally performed in units of polygons. For this reason, for example, when the object A is very small with respect to the object B, there is a problem that a portion of the object B that should not be made translucent becomes translucent. If the part that should not be made translucent becomes translucent in this way, for example, another object or the like will be seen through, and an unnatural and very hard to see image will result.

  Therefore, the present invention has been made in view of such a problem, and for example, does not use a determination process regarding a positional relationship between a virtual viewpoint and an object, a translucent process of translucent an object, and the like. A drawing processing program for causing a computer to execute, and a drawing processing program for causing a computer to execute the display processing so that an object hidden behind a shadow or the like can be displayed in a visible state, and the display processing can be realized at high speed and at low cost. It is an object of the present invention to provide a computer-readable recording medium storing a program, a program execution device for executing a drawing processing program, a drawing device, and a method.

  The present invention subdivides a frame in which a two-dimensional image is formed into predetermined unit regions, further determines a desired range in the frame, and determines whether or not overwriting can be performed for each unit region in the desired range. In particular, the drawing range in which the desired object is drawn in the frame or the drawing range in which the desired object is drawn in the frame is set as the desired range, and By performing the above-described setting of whether or not overwriting can be performed on a unit area corresponding to a predetermined rule pattern in each unit area, determination processing regarding the positional relationship between the virtual viewpoint and the object and half-processing of the object as in the related art are performed. Objects that are hidden behind other objects etc. can be displayed in a visible state without using transparency processing, etc., and the display processing is fast and cheap. It has become feasible.

  The present invention subdivides a frame in which a two-dimensional image is formed into predetermined unit regions, further determines a desired range in the frame, and determines whether or not overwriting can be performed for each unit region in the desired range. Set.

  In particular, in the present invention, a drawing range in which a desired object is drawn in a frame, or a drawing range in which a desired object is drawn in a frame is set as a desired range, and each unit area in the desired range is set as a desired range. Of these, by performing the above-described setting of whether or not overwriting is performed on a unit area according to a predetermined rule pattern, for example, a desired object that is blocked from a virtual viewpoint by another object appears to be translucent in appearance. Is drawn like so.

[Configuration of Drawing Apparatus According to Embodiment]
FIG. 1 shows a schematic configuration of a drawing apparatus 1 according to an embodiment of the present invention. Note that the drawing device 1 of the present embodiment is a device that draws a two-dimensional image by texture mapping to a three-dimensional polygon, and is applicable to, for example, a video game machine, a personal computer, and a three-dimensional graphic device. is there.

  In FIG. 1, a drawing apparatus 1 according to the present embodiment includes, as main components, a luminance calculation and coordinate conversion unit 2, a LOD (Level Of Detail) calculation unit 3, a texture coordinate calculation unit 4, and a DDA (Digital). A differential analyzer unit 5, a pixel engine 6, and an image memory 7 are provided.

  The image memory 7 includes a Z buffer 8 in which a value in the Z direction (Z coordinate value) from a virtual viewpoint is stored, a basic texture for generating an overall pattern on a polygon by mapping, and a basic texture. Texture buffer 9 for storing a texture for modulation for amplitude-modulating a pattern generated by the mapping of the above, and a frame buffer for storing and synthesizing frame data (two-dimensional image data) displayed on a two-dimensional monitor screen It has ten storage areas.

  For example, three-dimensional polygon information, texture information, light source information, viewpoint information, and the like are input to the input terminal 13 of the drawing apparatus 1 including these components as various information for drawing a three-dimensional image. . These various types of information are supplied through, for example, a communication line or a storage device.

  The three-dimensional polygon information includes, for example, (x, y, z) coordinates of each vertex of a triangular polygon and information of a normal line of each vertex. The texture information includes each texel information and each vertex of the triangular polygon. Is information consisting of texture coordinates corresponding to. Further, the viewpoint information and the light source information are information for performing the brightness calculation and the coordinate conversion for the polygon. The light source information is not limited to one light source, and may be information representing a plurality of light sources. In addition to the above, various information such as color information and fog values for giving an effect of fogging a distant object is added to each vertex information of the polygon. These various types of information are first input to the luminance calculation and coordinate conversion unit 2 of the drawing apparatus 1.

  The brightness calculation and coordinate conversion unit 2 converts the input coordinate information of each polygon into coordinate values of a coordinate system for two-dimensional rendering based on the viewpoint information, and also converts the brightness of each vertex of each polygon into viewpoint information and Calculate based on light source information. The luminance calculation and coordinate conversion unit 2 performs the above-described calculation and also performs processing such as perspective transformation. Each value calculated in the brightness calculation and coordinate conversion unit 2 is input to the LOD calculation unit 3.

  The LOD calculation unit 3 calculates an LOD (Level Of Detail) value used when the pixel engine 6 reads the basic texture from the texture buffer 9 from the Z coordinate of the converted polygon. Note that the LOD value is a value calculated from a reduction ratio when the polygon is reduced, and the reduction ratio is obtained, for example, as a logarithm of a distance from the viewpoint to the polygon. The LOD value is sent to the pixel engine 6 via the texture coordinate calculation unit 4 and the DDA unit 5.

  The texture coordinate calculation unit 4 calculates the texture coordinate values used when the pixel engine 6 reads the modulation texture from the texture buffer 9 from the texture coordinate values for the basic texture. These texture coordinate values are sent to the pixel engine 6 via the DDA unit 5.

  The DDA unit 5 converts the two-dimensional polygon vertex information, the Z coordinate value, the luminance information, and the like into pixel information. Specifically, for each pixel, its coordinate value, Z value, luminance, and texture coordinate value are sequentially obtained by linear interpolation. The output from the DDA unit 5 is sent to the pixel engine 6.

  The pixel engine 6 controls the reading and writing of the Z buffer 8, the texture buffer 9, and the frame buffer 10, and controls the texel information read from the texture buffer 9 and the pixel information obtained by the DDA unit 5. To perform texture mapping, Z coordinate comparison, and pixel value calculation.

  When performing the texture mapping in the pixel engine 6, mapping to three-dimensional polygons is performed by a so-called mipmap (MIPMAP) method using a basic texture stored in the texture buffer 9. .

  In the mipmap method, textures having different sizes such as 1/2, 1/4, 1/8,... (The ratio of the length of each side) are prepared in advance as textures to be attached to a three-dimensional polygon. In this method, the previously prepared texture is selected according to the reduction ratio, and is mapped to a three-dimensional polygon. According to the mipmap method, by mapping a texture obtained by reducing the original texture to a polygon as described above, it is possible to prevent the occurrence of aliasing when the polygon is reduced.

  When adding a higher frequency component to the basic texture at the time of texture mapping, the pixel engine 6 performs texture mapping using the modulation texture stored in the texture buffer 9.

  Further, the pixel engine 6 performs processing such as scissoring, dithering, and color clamping, and further, if necessary, processing such as an α test. Note that the scissoring is a process of removing data that has run off the screen, the dithering is a process of mixing the arrangement of colors for expressing many colors with a small number of colors, and the color clamp is a process of calculating colors. This is a process of limiting the value so that it does not sometimes exceed 255 or become smaller than 0. The α test is a process of controlling whether or not to draw, based on an α value for each pixel, that is, a coefficient value indicating a blend ratio of an image when mapping a texture.

  In the pixel engine 6, the image data obtained by the above-described processes is stored in the frame buffer 10 to form frame data (two-dimensional image data) to be drawn on the two-dimensional monitor screen, and thereafter, the formed frame data is formed. The two-dimensional image data is read from the frame buffer 10, output from the output terminal 14, and sent to the two-dimensional monitor device.

[First Embodiment of Drawing Processing]
Here, as described with reference to FIG. 8, for example, there is an object A in the field of view (frame F) from the virtual viewpoint, and another object B exists between the object A and the virtual viewpoint. In such a case, the drawing apparatus according to the present embodiment does not use the determination process regarding the positional relationship between the virtual viewpoint and the object and the translucent process of the object as described with reference to FIG. It is possible to generate an image that displays the object A hidden behind the object B in a visible state.

  Hereinafter, in the drawing apparatus having the configuration of FIG. 1, the flow of the drawing processing of the first embodiment when generating an image capable of displaying the object A hidden behind the object B in a visible state will be described. 2 and FIGS. 3 to 5.

  In FIG. 2, first, the pixel engine 6 determines an object (object A) to be displayed in a visible state as the process of step S1.

  Next, as processing of step S2, the pixel engine 6 forms, on the frame buffer 10, images of all objects other than the object A among objects to be drawn in the visual field (frame F) from the virtual viewpoint. (draw. In the example of the present embodiment, the object B is drawn in the frame F as shown in FIG.

  Further, the pixel engine 6 writes the Z value (distance from the virtual viewpoint (Z coordinate value)) of each pixel into the Z buffer 8 for all the objects drawn in the frame F as the process of step S3. In the present embodiment, the Z coordinate value of the virtual viewpoint is set to the maximum value, and the Z coordinate value at infinity is set to the minimum value.

  Next, as shown in FIG. 4, the pixel engine 6 divides the frame F into unit areas of a predetermined size (hereinafter, referred to as meshes M), and draws the object A, as shown in FIG. A predetermined range (including its periphery, if necessary) E to be determined is determined. In the example of FIG. 4, each of the meshes M is a quadrangle such as n × m (n, m = 1, 2, 3,...) Pixels, but is not limited thereto. And other shapes such as a polygon and a circle. One mesh may be one pixel.

  Next, the pixel engine 6 performs, as the process of step S5, each pixel included in each mesh Mc at every other dot (every other mesh) among the meshes M within the predetermined range E determined at step S4. Is deleted from the Z buffer 8 or set to infinity (hereinafter referred to as clear processing).

  That is, clearing the Z value for the mesh Mc means that overwriting can be performed on the mesh Mc that has been subjected to the clear processing. More specifically, for example, among the meshes M within the predetermined range E and included in the object B, for the mesh Mc whose Z value has been cleared, for example, the object A is more virtual than the object B. This means that the image of the object A can be overwritten on the image of the object B even if it is far from the viewpoint.

  After the process in step S5, the pixel engine 6 draws the object A in the frame F as the process in step S6.

  As described above, for example, even if the object B exists between the object A and the virtual viewpoint, the image of the last drawn object A is drawn on each mesh Mc whose Z value has been cleared. Become.

  That is, as shown in FIG. 5, for the portion ab of the object A that overlaps with the object B when viewed from the virtual viewpoint, the image of the object A is displayed at each mesh Mc portion whose Z value has been cleared. The object B is overwritten, and as a result, the object A can be seen through the semitransparent appearance of the object B. In addition, for the portion aa of the object A that does not overlap with the object B when viewed from the virtual viewpoint, the image of the object A is drawn as it is. Of course, as a matter of course, if no other object exists between the virtual viewpoint and the object A, the entire object A is drawn as it is.

  In the examples of FIGS. 4 and 5, the size of each mesh is drawn large for easy understanding on the drawing. As a result, the overlapping portion ab of the object A and the object B in FIG. Although it is drawn as (checkered pattern), the actual size of each mesh is very small, so it does not look like the above-mentioned check pattern, and the object A appears to be translucent and transparent. It becomes.

[Second Embodiment of Drawing Processing]
In the drawing process of the first embodiment described above, the frame F is divided into meshes M, and the mesh Mc in every other dot (every other mesh) of the meshes in the predetermined range E in which the object A is to be drawn. The semi-transparent drawing is realized by clearing the Z value corresponding to each pixel included in the first embodiment. However, in the following drawing process of the second embodiment, the same half-processing as that of the first embodiment is performed. It is possible to realize transparent drawing.

  Hereinafter, the flow of the drawing process according to the second embodiment of the present invention will be described with reference to FIG.

  6, first, the pixel engine 6 determines the object A as the process of step S11, as in step S1 of FIG.

  Next, the pixel engine 6 draws the object A first in the field of view (frame F) from the virtual viewpoint as the processing of step S12.

  Next, the pixel engine 6 divides the frame F by a mesh M of a predetermined size and determines a predetermined range E in which the object A is drawn, as in the example of FIG. I do. Note that the predetermined range E in the case of the second embodiment is desirably set only within the drawing range of the object A. Further, the mesh M in the case of the second embodiment is not limited to a regular square as in the case of the above-described first embodiment.

  Next, the pixel engine 6 performs, as the process of step S14, the frame buffer value corresponding to each pixel included in each mesh Mc at every other dot (every other mesh) among the meshes M within the predetermined range E. For example, by using the α test or the like, the drawing of pixels of another object is prohibited. Specifically, for example, by setting the α value of each pixel to 0% (minimum value), control is performed so that blending is not performed. Alternatively, the Z value corresponding to each pixel included in each mesh Mc is maximized (the Z coordinate value of the virtual viewpoint), and the drawing of pixels of other objects is virtually prohibited.

  When the Z coordinate value of the virtual viewpoint is designed to be the minimum value and the Z coordinate value at infinity is designed to be the maximum value, the Z coordinate value corresponding to each pixel included in each mesh Mc is set. Is set to the minimum (Z coordinate value of the virtual viewpoint), rendering of pixels of other objects is prohibited.

  That is, setting the mesh Mc to the drawing prohibition means that a new overwrite drawing cannot be performed on the mesh Mc for which the drawing is prohibited. More specifically, for example, among the meshes M included in the predetermined range E, for the mesh Mc for which the rendering is prohibited, even if the object B is closer to the virtual viewpoint than the object A, Means that the image of the object B cannot be overwritten and drawn on the image of the object A drawn at the same time.

  After the processing in step S14, the pixel engine 6 draws something other than the object A in the frame F as the processing in step S15. Thereby, even if the object B is positioned between the object A and the virtual viewpoint, drawing of the pixel of another object is prohibited on each of the meshes Mc. The image of the object A remains without being overwritten by the image of B.

  That is, as in the case of FIG. 5, for the portion ab of the object A that overlaps with the object B when viewed from the virtual viewpoint, an image of the object A remains in each of the mesh Mc portions. Above, the object A can be seen through the object B translucently. In addition, for the portion aa of the object A that does not overlap with the object B when viewed from the virtual viewpoint, the image of the object A remains as it is. Of course, if no other object exists between the virtual viewpoint and the object A, the entire object A remains as it is.

  In the pixel engine 6, the processing of the flowcharts of FIGS. 2 and 6 may be realized by a hardware configuration such as a DSP, or may be transmitted via a communication line such as a CPU. It can also be realized in software by a drawing processing program or a drawing processing program read from a storage medium by a storage device. In particular, the drawing processing program when the drawing processing in the pixel engine 6 is realized by software is a program that sequentially performs the processing of each step described in the flowcharts of FIG. 2 and FIG. The drawing processing program can be input not only in advance as a processing program for the pixel engine 6 but also, for example, from the input terminal 13 in FIG. 1 together with the polygon information or the like or prior to it.

  FIG. 7 shows a schematic configuration of a personal computer that executes a drawing processing program of the flow shown in FIGS. 2 and 6 as a specific configuration example for realizing the drawing processing of the present embodiment in software. The image processing program according to the present embodiment is mainly executed by the CPU 123 shown in FIG.

  In FIG. 7, the storage unit 128 includes, for example, a hard disk and its drive. The hard disk includes an operating system program, a drawing processing program 129 according to the present embodiment, which is fetched from various recording media such as a CD-ROM and a DVD-ROM, or fetched via a communication line, Various kinds of data 130 such as graphic information for polygon drawing, texture, Z value, normal texture, color value, and α value are stored.

  The communication unit 121 includes, for example, a modem for connecting to an analog public telephone line, a cable modem for connecting to a cable television network, a terminal adapter for connecting to ISDN (Integrated Services Digital Network), and an ADSL (Asymmetric Digital Subscriber). A communication device for performing data communication with the outside, such as a modem for connecting to a line. The communication I / F unit 122 is an interface device that performs protocol conversion and the like for enabling data exchange between the communication unit 121 and an internal bus (BUS).

  The input unit 133 is an input device such as a keyboard, a mouse, and a touch pad, and the user I / F unit 132 is an interface device for supplying a signal from the input unit 133 to the inside.

  The drive unit 135 reads various programs and data including the image processing program according to the present embodiment from a disk medium 151 such as a CD-ROM or a DVD-ROM or a recording medium such as a semiconductor memory such as a card. It is a possible drive device. The drive I / F unit 134 is an interface device for supplying a signal from the drive unit 135 to the inside.

  The display unit 137 is a display device such as a CRT (cathode ray tube) or a liquid crystal, and the display drive unit 136 is a drive device that drives the display unit 137 to display.

  The ROM 124 is composed of, for example, a rewritable nonvolatile memory such as a flash memory, and stores a BIOS (Basic Input / Output System) of the personal computer and various initial setting values. The RAM 125 is loaded with application programs and various data read from the hard disk of the storage unit 128, and is used as a work RAM of the CPU 123.

  The CPU 123 controls all operations of the personal computer and executes the above-described drawing processing based on the operating system program stored in the storage unit 128 and the drawing processing program 129 of the present embodiment. That is, in the configuration shown in FIG. 7, the CPU 123 executes the drawing processing program of the present embodiment, which is one of the application programs read from the hard disk of the storage unit 128 and loaded into the RAM 125. Thus, the drawing processing described in the above-described embodiment is realized.

[Summary of Embodiment of the Present Invention]
As described above, according to the first and second embodiments of the present invention, the inside of the frame F is divided into the meshes M, and for each mesh M in the predetermined range E in which a certain predetermined object A is to be drawn, By setting whether or not overwriting is possible, for example, by clearing the Z value for each mesh Mc every other dot (every other mesh) or prohibiting the drawing of other objects, for example, the virtual viewpoint and the A predetermined object which is hidden behind another object or the like can be displayed in a visible state at a high speed and at a low cost without using a determination process relating to a positional relationship or a translucent process of translucent an object. I have.

  Further, in the present embodiment, since the Z value clearing process or the drawing prohibition of another object is set in pixel units, for example, the object A is very small with respect to the object B. However, unlike the conventional translucent process, there is no problem that the portion of the object B that should not be translucent becomes translucent.

  The description of each embodiment described above is an example of the present invention. Therefore, the present invention is not limited to the above-described embodiments, and various changes can be made according to the design and the like as long as the technical idea according to the present invention is not deviated. is there.

  For example, in the first and second embodiments, the process of clearing the Z value or prohibiting the drawing of another object is a regular pattern every other dot (every other mesh). The present invention is not limited to this. For example, every N dots (N = 1, 2, 3,...) Such as every two dots (every two meshes), every third dot (every three meshes), or every other N dots A regular pattern such as alternately repeating every N + L (L = 1, 2, 3,...) Dots may be used.

  For example, when a rule pattern of every other dot (every other mesh) is adopted, the degree of translucency is 50%. For example, when a rule pattern of every two dots (every two meshes) is adopted, the degree of translucency is reduced. Therefore, according to the present invention, the degree of translucency can be arbitrarily set according to the rule pattern.

  In addition, the above rule pattern is not a checkerboard pattern as described above, but can be any other pattern pattern. In addition to the apparent translucency as described above, various images such as a special presentation method can be used. The effect can be realized. As the arbitrary pattern pattern, for example, a pattern pattern for expressing a certain picture or symbol, a pattern for realizing a special image effect, and the like can be considered. For example, in the case where a picture pattern is used, for example, drawing such as a so-called watermark picture can be easily realized.

FIG. 1 is a diagram illustrating a schematic configuration example of a main part of a drawing apparatus according to an embodiment of the present invention. 5 is a flowchart illustrating a flow of a drawing process according to the first embodiment of the present invention. FIG. 3 is a diagram showing a state in which an object B is drawn in a frame F by the processing in step S2 of the flowchart in FIG. 2. It is a figure used for description of meshing of frame F and mesh Mc which carries out clear processing of predetermined range E and Z value. FIG. 5 is a diagram used to explain a schematic state of an image that is apparently made translucent by drawing processing according to the embodiment of the present invention. 9 is a flowchart illustrating a flow of a drawing process according to the second embodiment of the present invention. FIG. 7 is a block diagram illustrating a schematic configuration of a personal computer that executes a drawing processing program of the flow illustrated in the flowcharts of FIGS. 2 and 6. FIG. 5 is a diagram used to explain an image in a state where a part of an object A is blocked by an object B when viewed from a virtual viewpoint. It is a figure used for the judgment processing about the conventional positional relation of the virtual viewpoint and the object, and the explanation of the image obtained by the translucency processing of the object.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Drawing apparatus, 2 ... Luminance calculation and coordinate conversion unit, 3 ... LOD calculation unit, 4 ... Texture coordinate calculation unit, 5 ... DDA unit, 6 ... Pixel engine, 7 ... Image memory, 8 ... Z buffer, 9 ... Texture Buffer, 10 ... frame buffer

Claims (24)

A visible target determining step of determining a visible target object to be made visible,
An image generating step of generating a frame image in which all objects except the visible target object are drawn in a frame where a two-dimensional image is formed;
A setting step of setting overwriting in a predetermined range of the frame image including at least a drawing range for drawing the visible target object, for each subdivided predetermined unit area;
The visible target object is overwritten on the unit area for which the overwrite rendering is set, and the visible target object and the virtual viewpoint are set for the unit area for which the overwrite rendering is not set. Does not overwrite the visible target object when there is another object other than the visible target object between them, and renders the visible target object when there is no other object between the visible target object and the virtual viewpoint. A drawing processing program to be executed by a computer, comprising the step of overwriting and drawing an object. The drawing processing program according to claim 1, wherein
A drawing processing program for causing a computer to execute a range determination step of determining the drawing range in the frame image and determining the predetermined range according to the drawing range. A drawing processing program according to claim 1 or 2, wherein:
In the setting step, the computer is characterized in that the overwriting is permitted by setting the Z coordinate value representing the distance from the virtual viewpoint to the unit area to be deleted or set to infinity. Drawing processing program for The drawing processing program according to any one of claims 1 to 3,
In the setting step, the overwriting is permitted to be set in a unit area according to a predetermined rule pattern among the unit areas in the predetermined range. Processing program. A visible target determining step of determining a visible target object to be made visible,
An object drawing step of drawing the visible target object in a frame where a two-dimensional image is formed;
A setting step of performing at least a setting of rejection of overwrite drawing for each of predetermined subdivided unit areas within a predetermined range in the frame including at least the drawing range in which the visible target object is drawn,
An object other than the visible target object is not overwritten in the unit area in which the setting of the overwrite drawing is set, and the visible area is set in the unit area in which the setting of the overwrite drawing is not set. When the other object does not exist between the target object and the virtual viewpoint, the other object is not overwritten, and when the other object exists between the visible target object and the virtual viewpoint, the other object is not drawn. A drawing processing program to be executed by a computer. The drawing processing program according to claim 5, wherein
In the setting step, the overwrite rendering rejection setting is performed by setting a coefficient value indicating a blend ratio used when mapping an image to the unit area to a minimum value. A drawing processing program to be executed by a computer that performs the processing. The drawing processing program according to claim 5, wherein
The computer according to claim 1, wherein in the setting step, the Z coordinate value indicating the distance from the virtual viewpoint is set to the Z coordinate value of the virtual viewpoint with respect to the unit area, so that the overwriting is prohibited. A drawing processing program to be executed. The drawing processing program according to any one of claims 5 to 7, wherein
In the setting step, a setting for prohibiting the overwriting is performed on a unit area according to a predetermined rule pattern among the unit areas within the predetermined range, wherein the drawing for execution by a computer is performed. Processing program. A drawing processing program according to claim 4 or claim 8, wherein
In the setting step, a drawing ratio of the visible target object is determined according to the predetermined rule pattern. A drawing processing program to be executed by a computer. A drawing processing program according to any one of claims 4, 8, and 9, wherein:
A drawing processing program to be executed by a computer, comprising a step of setting the predetermined rule pattern to a predetermined pattern. The drawing processing program according to any one of claims 1 to 10, wherein
A drawing processing program to be executed by a computer, comprising a step of subdividing the inside of the frame into the unit areas.   A computer-readable recording medium storing the drawing processing program according to claim 1.   A program execution device that executes the drawing processing program according to any one of claims 1 to 11. A visible object determining unit that determines a visible object to be made visible,
An image generation unit that generates a frame image in which all objects except the visible target object are drawn in a frame where a two-dimensional image is formed;
A setting unit for performing at least a settable of overwrite drawing for each of predetermined subdivided unit areas within a predetermined range of the frame image including at least a drawing range for drawing the visible target object,
The visible target object is overwritten on the unit area for which the overwrite rendering is set, and the visible target object and the virtual viewpoint are set for the unit area for which the overwrite rendering is not set. Does not overwrite the visible target object when there is another object other than the visible target object between them, and renders the visible target object when there is no other object between the visible target object and the virtual viewpoint. A drawing apparatus, comprising: an overwrite drawing processing unit that draws an object by overwriting. The drawing apparatus according to claim 14, wherein
A drawing apparatus, comprising: a range determination unit that determines the drawing range in the frame image and determines the predetermined range according to the drawing range. The drawing apparatus according to claim 14 or claim 15, wherein:
The drawing device, wherein the setting unit performs the setting of the overwrite drawing by deleting a Z coordinate value indicating a distance from the virtual viewpoint or setting the Z coordinate value to infinity with respect to the unit area. A visible object determining unit that determines a visible object to be made visible,
An object drawing unit that draws the visible target object in a frame where a two-dimensional image is formed;
A setting unit that performs a setting of whether or not to perform overwrite drawing for each of the subdivided predetermined unit areas within a predetermined range in the frame including at least the drawing range in which the visible target object is drawn,
An object other than the visible target object is not overwritten in the unit area in which the setting of the overwrite drawing is set, and the visible area is set in the unit area in which the setting of the overwrite drawing is not set. When the other object does not exist between the target object and the virtual viewpoint, the other object is not overwritten, and when the other object exists between the visible target object and the virtual viewpoint, the other object is not drawn. And an overwrite drawing processing unit for overwriting the object. The drawing apparatus according to claim 17, wherein
The setting unit sets the coefficient value indicating a blending ratio used when mapping an image to the unit area to a minimum value, thereby performing the setting of the overwrite rendering. Drawing device. The drawing apparatus according to claim 17, wherein
The setting unit sets the Z coordinate value indicating the distance from the virtual viewpoint to the Z coordinate value of the virtual viewpoint with respect to the unit area, thereby performing the setting of the overwrite drawing. apparatus. The drawing apparatus according to any one of claims 14 to 19, wherein:
The drawing device, wherein the setting unit performs the setting of whether or not the overwrite drawing is permitted or not for a unit area according to a predetermined rule pattern among the unit areas within the predetermined range. The drawing apparatus according to claim 20, wherein
The drawing device, wherein the setting unit changes a drawing ratio of the desired object by setting the predetermined rule pattern. The drawing apparatus according to claim 20 or claim 21,
The drawing device, wherein the setting unit sets the predetermined rule pattern to a predetermined pattern. Determine the visible target object to be made visible,
In a frame where a two-dimensional image is formed, generate a frame image in which all objects except the visible target object are drawn,
At least within the predetermined range of the frame image including the drawing range for drawing the visible target object, perform overwriting enabled for each of the subdivided predetermined unit areas,
The visible target object is overwritten on the unit area for which the overwrite rendering is set, and the visible target object and the virtual viewpoint are set for the unit area for which the overwrite rendering is not set. Does not overwrite the visible target object when there is another object other than the visible target object between them, and renders the visible target object when there is no other object between the visible target object and the virtual viewpoint. A drawing method characterized by drawing over an object. Determine the visible target object to be made visible,
The visible target object is drawn in a frame in which a two-dimensional image is formed, and at least a predetermined unit area subdivided within a predetermined range in the frame including a drawing range in which the visible target object is drawn Set whether to overwrite each time,
An object other than the visible target object is not overwritten in the unit area in which the setting of the overwrite drawing is set, and the visible area is set in the unit area in which the setting of the overwrite drawing is not set. When the other object does not exist between the target object and the virtual viewpoint, the other object is not overwritten, and when the other object exists between the visible target object and the virtual viewpoint, the other object is not drawn. A drawing method, characterized by drawing over an object of another type.

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