JP3737784B2 - 3D image processing program, 3D image processing method, and video game apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a three-dimensional image processing program for drawing a model composed of a plurality of polygons, a three-dimensional image processing method, and a video game apparatus.
[0002]
[Prior art]
  Conventionally, methods for expressing water surfaces such as ponds, lakes, and seas in a virtual three-dimensional space such as a video game include a method that emphasizes water surface transparency and a method that emphasizes water surface reflectivity. In the method of emphasizing the transparency, the texture attached to the polygon constituting the water surface is made translucent so that the bottom of the water can be seen.
[0003]
  FIG. 6 is a screen diagram showing an example of a game screen in which a water surface model is drawn by a conventional method that places importance on transparency. In the game screen 500 shown in FIG. 6, a land 502 as a background is displayed above the screen, and a water surface 501 of the lake is displayed below the land 502, so that a character 503 stands on the water surface 501 for convenience. Is displayed. On the water surface 501, a rock 506, which is part of the topography that forms the bottom of the water, and a fish 507 arranged between the water surface and the bottom of the water are displayed. A virtual camera viewpoint provided at an arbitrary position in the virtual three-dimensional space is provided at a position overlooking the water surface 501. In a method that places importance on transparency, for example, a light blue image is used as a texture to be pasted on a polygon that forms the water surface, and the transparency is set to be constant so that the polygon is translucent. In such a method emphasizing transparency, both the water surface 501 in the area 504 on the near side of the screen close to the virtual camera viewpoint and the water surface 501 in the area 505 on the far side of the screen far from the virtual camera viewpoint pass through the water surface 501. A rock 506 and a fish 507 are displayed.
[0004]
  Further, in the method that places importance on reflectivity, an image obtained by vertically inverting a model on the water reflected on the water surface is pasted as a texture on a polygon that forms the water surface.
[0005]
  FIG. 7 is a screen diagram illustrating an example of a game screen in which a water surface model is drawn by a conventional method that places importance on reflectivity. On the game screen 600 shown in FIG. 7, a land 602 and a sky 603 as a background are displayed above, a water surface 601 of a lake is displayed below the land 602, and a character 604 stands on the water surface 601 for convenience. Is displayed. A virtual camera viewpoint provided at an arbitrary position in the virtual three-dimensional space is provided at a position overlooking the water surface 601. In the method that places importance on reflectivity, for example, an image obtained by inverting the background upside down is used as a texture to be pasted on a polygon constituting the water surface, and the transparency is set to be constant so that the polygon is also totally reflected. In such a method emphasizing reflectivity, the water surface 601 in the area 605 on the near side of the screen near the virtual camera viewpoint and the water surface 601 in the area 606 on the far side of the screen far from the virtual camera viewpoint are both reflected and background. The land 602 and the sky 603 are displayed.
[0006]
[Problems to be solved by the invention]
  However, in reality, when the water surface is viewed from directly above, the water appears to pass through, but when the water surface is viewed from the side, the surrounding environment is reflected and reflected on the water surface. In this way, the fact that the appearance of the boundary surface of materials having different refractive indexes changes depending on the angle viewed by the observer is called the Fresnel effect. When the angle between the observer's line of sight and the water surface is large, the water surface appears to be transmitted, and when the angle is small, the water surface appears to be reflected.
[0007]
  Here, looking at the conventional method described above, the method that places importance on transparency is that the polygons that make up the water surface 501 are all transmitted and displayed as shown in FIG. Not only (the area 504 on the near side of the screen) but also the water surface 501 (the area 505 on the far side of the screen) far from the virtual camera viewpoint is transmitted and displayed. Further, in the method of emphasizing reflectivity, since all the polygons constituting the water surface 601 are reflected and displayed as shown in FIG. 7, not only the water surface 601 (region 606 on the back side of the screen) far from the virtual camera viewpoint. The water surface 601 (region 605 on the near side of the screen) near the virtual camera viewpoint is also reflected and displayed. Therefore, the conventional method has a problem that the near-field and the far-field are displayed in the same manner, and the real-world Fresnel effect is not realized, resulting in lack of realism.
[0008]
  The present invention has been made in order to solve the above-described problem. A three-dimensional image processing program, a three-dimensional image processing method, and a three-dimensional image processing method capable of realizing a video game with a real feeling by realizing the Fresnel effect in a pseudo manner. An object of the present invention is to provide a video game device.
[0009]
[Means for Solving the Problems]
  The present invention according to claim 1 is a three-dimensional image processing program for drawing a model composed of a plurality of polygons,
  Transparency changing means for changing the transparency of the model in a predetermined area set based on a virtual camera viewpoint in a virtual three-dimensional space;
  Texture pasting means for pasting a texture to the model whose transparency has been changed by the transparency changing means;
  A video game device is caused to function as a drawing unit that draws the model with the texture pasted by the texture pasting unit,
  The transparency changing means calculates transparency of each vertex of a plurality of polygons constituting the model in the predetermined area;
  The texture pasting means sets the texture transparency according to the transparency of each vertex calculated by the transparency changing means, and complements the texture transparency between the vertices.And
The region is centered on the intersection of a perpendicular line from the virtual camera viewpoint to the plane including the region and the plane,
The transparency changing means lowers the transparency from the center point toward the outer edge of the region, and constitutes the square value of the distance from the center point to the outer edge of the region, and the model in the region from the center point The transparency of each vertex is calculated based on the ratio to the square value of the distance to each vertex of the plurality of polygonsIt is characterized by that.
[0010]
  According to the first aspect of the present invention, a 3D image processing program for drawing a model composed of a plurality of polygons is set based on a virtual camera viewpoint in a virtual 3D space by a transparency changing unit. The model in which the transparency of the model in the predetermined region is changed, the texture is pasted on the model whose transparency is changed by the transparency changing means by the texture pasting means, and the texture is pasted by the texture pasting means by the drawing means Draw.
[0011]
  That is, the transparency of the model in a predetermined region set based on the virtual camera viewpoint in the virtual three-dimensional space is changed, the texture is pasted on the model with the changed transparency, and the model on which the texture is pasted is Drawn.
[0012]
  For example, since the transparency of a model in a predetermined area is changed and rendered, the transparency of the polygon near the virtual camera viewpoint is increased, and the polygon transparency is decreased as the distance from the virtual camera viewpoint is increased. The effect can be realized in a pseudo manner, and a realistic video game can be realized.
[0013]
  Also,The predetermined area set based on the virtual camera viewpoint in the virtual three-dimensional space is centered on the intersection of the perpendicular line from the virtual camera viewpoint to the plane including the area and the plane, and the transparency changing means Decrease the transparency from to the outer edge of the area.
[0014]
  That is, the intersection of the virtual camera viewpoint in the virtual three-dimensional space, which is perpendicular to the plane including the region, is set as the center point, and the transparency of the model is lowered radially from the center point. Therefore, polygons close to the virtual camera viewpoint can be drawn with high transparency, and polygons far from the virtual camera viewpoint can be drawn with low transparency, which simulates the Fresnel effect. It can be realized, and a realistic video game can be realized.
[0015]
  furtherThe transparency changing means is the square value of the distance from the center point of the region centered on the point perpendicular to the model from the viewpoint of the virtual camera in the virtual three-dimensional space, and the center point of the region to the inside of the region. Transparency at each vertex is calculated based on the ratio to the square value of the distance to each vertex of a plurality of polygons constituting the model.
[0016]
  In other words, a square value of the distance from the center point to the outer edge of the region centered on a point that is perpendicular to the model from the virtual camera viewpoint in the virtual three-dimensional space, and the model in the region from the center point of the region Since the transparency of each vertex is calculated based on the ratio of the distance to the vertex of each of the polygons, the transparency of the model in the region can be changed according to the distance from the center point of the region. . In addition, the distance from the center point of the area to each vertex of the polygons that make up the model in the area is expressed as a square root by the coordinate value representing the arbitrary vertex, but the square of the distance from the center point of the area to the outer edge The distance from the center point of the region to the outer edge and the center of the region equivalently by calculating the ratio of the value and the square value of the distance from the center point of the region to the vertices of the polygons that make up the model in the region The ratio of the distance from each point to the vertices of a plurality of polygons constituting the model in the region can be obtained, so that it is not necessary to perform the square root calculation process, and the time required for the calculation process can be shortened.
[0017]
  Claim2According to the present invention, the texture pasting means pastes an image obtained by drawing a background model arranged around the model and flipped upside down as a texture to the model located in the region. .
[0018]
  Claim2According to the present invention described in the above, the texture pasting unit is configured to draw a background model arranged around a model made up of a plurality of polygons and to place the model upside down as a texture in the predetermined area. Paste to.
[0019]
  That is, a background model arranged around a model composed of a plurality of polygons is drawn, and an image obtained by vertically flipping the drawn image is pasted to a model located in a predetermined region as a texture. The surrounding background can be reflected in the model provided in the dimensional space. In addition, by making the near view transparent and capturing the background in the distant view, a pseudo Fresnel effect can be realized, and the realism increases.
[0020]
  Claim3According to the present invention, the region includes a transparency changing region that can change the transparency of the model, and an opaque region that can make the model opaque.
  The texture pasting means pastes an image obtained by drawing a background model arranged around the model and flipped upside down as a texture onto the model located in the opaque region.
[0021]
  Claim3In accordance with the present invention, the predetermined area set based on the virtual camera viewpoint in the virtual three-dimensional space includes a transparency changing area that can change the transparency of the model, and an opaque area that can make the model opaque. The texture pasting means pastes an image obtained by drawing a background model arranged around the model and flipped upside down as a texture to the model located in the opaque region.
[0022]
  That is, among the areas including the transparency changing area that can change the transparency of the model and the opaque area that can make the model opaque, the transparency is changed in the transparency changing area, and the transparency is not changed in the opaque area outside the transparency changing area. It is possible to paste an image that is rendered opaque and drawn upside down and turned upside down as a texture. Therefore, it is possible to clearly reflect the surrounding background on the model located away from the viewpoint of the virtual camera, to realize a pseudo Fresnel effect, and to increase the realism.
[0023]
  In the present invention, a model representing a water surface can be used as the model.
[0024]
  According to this configuration, the water surface is represented by a model composed of a plurality of polygons. For example, the water surface is designed so that the model near the virtual camera viewpoint has high transparency and the model far from the virtual camera viewpoint has low transparency. By changing the transparency of the model to be represented, a pseudo Fresnel effect can be realized, and the water surface can be represented realistically.
[0025]
  Claim4The present invention described in 3 is a three-dimensional image processing method for drawing a model composed of a plurality of polygons,
  A transparency changing step in which the video game device changes the transparency of the model in a predetermined area set based on a virtual camera viewpoint in a virtual three-dimensional space;
  A texture pasting step in which the video game device pastes a texture on the model whose transparency has been changed in the transparency changing step;
  A video game device including a drawing step of drawing the model to which a texture is pasted in the texture pasting step;
  The transparency changing step calculates transparency of each vertex of a plurality of polygons constituting the model in the predetermined region,
  The texture pasting step sets the transparency of the texture according to the transparency of each vertex calculated in the transparency changing step, and is set by complementing the transparency of the texture between the vertices.And
The region is centered on the intersection of a perpendicular line from the virtual camera viewpoint to the plane including the region and the plane,
In the transparency changing step, the transparency is lowered from the center point toward the outer edge of the region, and the square value of the distance from the center point to the outer edge of the region and the model in the region from the center point are configured. Based on the ratio to the square value of the distance to each vertex of a plurality of polygons Calculate the transparency of each vertexIt is characterized by that.
[0026]
  Claim4According to the present invention described in the above, a 3D image processing method for drawing a model composed of a plurality of polygons is set based on a virtual camera viewpoint in a virtual 3D space by a video game device in a transparency changing step. The video game device changes the transparency of the model in the predetermined region, and the video game device pastes the texture to the model whose transparency has been changed in the transparency change step in the texture pasting step. The model to which the texture is pasted in the pasting step is drawn.
[0027]
  That is, the transparency of the model in a predetermined region set based on the virtual camera viewpoint in the virtual three-dimensional space is changed, the texture is pasted on the model with the changed transparency, and the model on which the texture is pasted is Drawn.
[0028]
  For example, since the transparency of a model in a predetermined area is changed and rendered, the transparency of the polygon near the virtual camera viewpoint is increased, and the polygon transparency is decreased as the distance from the virtual camera viewpoint is increased. The effect can be realized in a pseudo manner, and a realistic video game can be realized.
[0029]
  Claim5The present invention described in the above is a video game apparatus for drawing a model composed of a plurality of polygons,
  Transparency changing means for changing the transparency of the model in a predetermined area set based on a virtual camera viewpoint in a virtual three-dimensional space;
  Texture pasting means for pasting a texture to the model whose transparency has been changed by the transparency changing means;
  Drawing means for drawing the model with the texture pasted by the texture pasting means;
  Display means for displaying the model drawn by the drawing means,
  The transparency changing means calculates transparency of each vertex of a plurality of polygons constituting the model in the predetermined area;
  The texture pasting means sets the texture transparency according to the transparency of each vertex calculated by the transparency changing means, and complements the texture transparency between the vertices.And
The region is centered on the intersection of a perpendicular line from the virtual camera viewpoint to the plane including the region and the plane,
The transparency changing means lowers the transparency from the center point toward the outer edge of the region, and constitutes the square value of the distance from the center point to the outer edge of the region, and the model in the region from the center point The transparency of each vertex is calculated based on the ratio to the square value of the distance to each vertex of the plurality of polygonsIt is characterized by that.
[0030]
  Claim5According to the present invention described in the above, a video game apparatus that draws a model composed of a plurality of polygons is provided in a predetermined area set based on the virtual camera viewpoint in the virtual three-dimensional space by the transparency changing means. Change the transparency of the model, paste the texture to the model whose transparency has been changed by the transparency changing means by the texture pasting means, draw the model by the texture pasting means by the drawing means, draw the model by the display means, The model drawn by the drawing means is displayed.
[0031]
  That is, the transparency of the model in a predetermined area set based on the virtual camera viewpoint in the virtual three-dimensional space is changed, the texture is pasted on the model whose transparency is changed, and the model on which the texture is pasted is The drawn model is displayed.
[0032]
  For example, since the transparency of the model in a given area is changed and rendered, the transparency of the polygon near the virtual camera viewpoint is increased and the transparency of the polygon is decreased as the distance from the virtual camera viewpoint is increased. The effect can be realized in a pseudo manner, and a realistic video game can be realized.
[0033]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, a video game apparatus according to an embodiment of the present invention will be described with reference to the drawings.
[0034]
  FIG. 1 is a block diagram showing a configuration of a video game apparatus according to an embodiment of the present invention. In the following description, a home video game apparatus configured by connecting a home video game machine to a home television will be described as an example of the video game apparatus, but the present invention is particularly limited to this example. In addition, the present invention can be similarly applied to a professional video game apparatus with an integrated monitor, a personal computer that functions as a video game apparatus by executing a video game program, and the like.
[0035]
  The video game apparatus shown in FIG. 1 includes a home game machine 100 and a home television 200. The home-use game machine 100 is loaded with a computer-readable recording medium 300 on which a video game program and game data are recorded, and the video game program and game data are appropriately read to execute the game.
[0036]
  A consumer game machine 100 includes a CPU (Central Processing Unit) 1, a bus line 2, a graphics data generation processor 3, an interface circuit (I / F) 4, a main memory 5, a ROM (Read Only Memory) 6, and an expansion circuit 7. , Parallel port 8, serial port 9, drawing processor 10, audio processor 11, decoder 12, interface circuit 13, buffers 14 to 16, recording medium drive 17, memory 18, and controller 19. The home television 200 includes a television monitor 21, an amplifier circuit 22 and a speaker 23.
[0037]
  The CPU 1 is connected to the bus line 2 and the graphics data generation processor 3. The bus line 2 includes an address bus, a data bus, a control bus, and the like. The CPU 1, interface circuit 4, main memory 5, ROM 6, decompression circuit 7, parallel port 8, serial port 9, drawing processor 10, audio processor 11, decoder 12 And the interface circuit 13 are connected to each other.
[0038]
  The drawing processor 10 is connected to the buffer 14. The audio processor 11 is connected to the buffer 15 and the amplifier circuit 22. The decoder 12 is connected to the buffer 16 and the recording medium drive 17. The interface circuit 13 is connected to the memory 18 and the controller 19.
[0039]
  The television monitor 21 of the home television 200 is connected to the drawing processor 10. The speaker 23 is connected to the amplifier circuit 22. In the case of an arcade video game apparatus, the television monitor 21, the amplifier circuit 22, and the speaker 23 may be housed in a single casing together with each block constituting the consumer game machine 100.
[0040]
  When the video game apparatus is configured with a personal computer, a workstation, or the like as a core, the television monitor 21 or the like corresponds to a computer display. The decompression circuit 7, the drawing processor 10, the audio processor 11, and the like correspond to a part of program data recorded in the recording medium 300 or hardware on an expansion board mounted in an expansion slot of a computer. The interface circuit 4, the parallel port 8, the serial port 9, and the interface circuit 13 correspond to hardware on an expansion board mounted in an expansion slot of a computer. The buffers 14 to 16 correspond to the storage areas of the main memory 5 or the expansion memory, respectively.
[0041]
  Next, each component shown in FIG. 1 will be described. The graphics data generation processor 3 serves as a coprocessor for the CPU 1. That is, the graphics data generation processor 3 performs coordinate conversion and light source calculation, for example, calculation of a fixed point format matrix or vector by parallel processing.
[0042]
  The main processing performed by the graphics data generation processor 3 is based on the coordinate data, movement amount data, rotation amount data, etc. of each vertex in the two-dimensional or virtual three-dimensional space of the image data supplied from the CPU 1. There are processing for obtaining address data of the processing target image on the display area and returning it to the CPU 1, processing for calculating the luminance of the image according to the distance from the virtually set light source, and the like.
[0043]
  The interface circuit 4 is used for an interface of a peripheral device such as a pointing device such as a mouse or a trackball. The main memory 5 is composed of a RAM (Random Access Memory) or the like. The ROM 6 stores program data serving as an operating system for the video game apparatus. This program corresponds to a BIOS (Basic Input Output System) of a personal computer.
[0044]
  The decompression circuit 7 performs decompression processing on a compressed image compressed by intra coding conforming to the MPEG (Moving Picture Experts Group) standard for moving images and the JPEG (Joint Photographic Experts Group) standard for still images. The decompression processing includes decoding processing (decoding of data encoded by VLC: Variable Length Code), inverse quantization processing, IDCT (Inverse Discrete Cosine Transform) processing, intra image restoration processing, and the like.
[0045]
  The drawing processor 10 performs a drawing process on the buffer 14 based on a drawing command issued by the CPU 1 every predetermined time T (for example, T = 1/60 seconds in one frame).
[0046]
  The buffer 14 is constituted by a RAM, for example, and is divided into a display area (frame buffer) and a non-display area. The display area is composed of a data development area to be displayed on the display surface of the television monitor 21. The non-display area is composed of storage areas such as data for defining a skeleton, model data for defining polygons, animation data for causing the model to move, pattern data indicating the contents of each animation, texture data, and color palette data.
[0047]
  Here, the texture data is two-dimensional image data. The color palette data is data for designating a color such as texture data. The CPU 1 records these data in the non-display area of the buffer 14 in advance from the recording medium 300 at a time or divided into a plurality of times according to the progress of the game.
[0048]
  The drawing command includes a drawing command for drawing a stereoscopic image using a polygon and a drawing command for drawing a normal two-dimensional image. Here, the polygon is a polygonal two-dimensional virtual figure, and for example, a triangle or a quadrangle is used.
[0049]
  A drawing command for drawing a stereoscopic image using polygons is polygon vertex address data indicating the storage position of polygon vertex coordinate data on the display area of the buffer 14, and the storage position of the texture to be pasted on the polygon 14 on the buffer 14. Is performed on each of the color address data indicating the storage position on the buffer 14 and the color data indicating the texture brightness.
[0050]
  Among the above data, the polygon vertex address data on the display area is converted by the graphics data generation processor 3 from the polygon vertex coordinate data in the virtual three-dimensional space from the CPU 1 based on the movement amount data and the rotation amount data. Is replaced with the polygon vertex coordinate data in two dimensions. The luminance data is determined by the graphics data generation processor 3 based on the distance from the position indicated by the polygon vertex coordinate data after the coordinate conversion from the CPU 1 to the light source virtually arranged.
[0051]
  The polygon vertex address data indicates an address on the display area of the buffer 14. The drawing processor 10 performs a process of writing texture data corresponding to the display area range of the buffer 14 indicated by the three polygon vertex address data.
[0052]
  An object such as a character in the game space is composed of a plurality of polygons. The CPU 1 stores the coordinate data of each polygon in the virtual three-dimensional space in the buffer 14 in association with the corresponding skeleton vector data. When the character is moved on the display screen of the television monitor 21 by an operation of the controller 19 to be described later, when the character movement is expressed or the viewpoint position at which the character is viewed is changed, the following Processing is performed.
[0053]
  That is, the CPU 1 obtains the graphics data generation processor 3 from the three-dimensional coordinate data of the vertices of each polygon held in the non-display area of the buffer 14, the skeleton coordinates, and the rotation amount data. Polygon movement amount data and rotation amount data are given.
[0054]
  The graphics data generation processor 3 sequentially obtains the three-dimensional coordinate data after moving and rotating each polygon based on the three-dimensional coordinate data of the vertex of each polygon and the movement amount data and rotation amount data of each polygon.
[0055]
  Of the three-dimensional coordinate data of each polygon thus obtained, the coordinate data in the horizontal and vertical directions are supplied to the drawing processor 10 as address data on the display area of the buffer 14, that is, polygon vertex address data.
[0056]
  The drawing processor 10 writes the texture data indicated by the texture address data assigned in advance on the display area of the buffer 14 indicated by the three polygon vertex address data. As a result, on the display screen of the television monitor 21, an object in which textures are pasted on a large number of polygons is displayed.
[0057]
  A drawing command for drawing a normal two-dimensional image indicates vertex address data, texture address data, color palette address data indicating the storage position on the buffer 14 of color palette data indicating the color of the texture data, and luminance of the texture. This is performed on the luminance data. Among these data, the vertex address data is obtained by the coordinate conversion of the vertex coordinate data on the two-dimensional plane from the CPU 1 by the graphics data generation processor 3 based on the movement amount data and the rotation amount data from the CPU 1.
[0058]
  The audio processor 11 stores ADPCM (Adaptive Differential Pulse Code Modulation) data read from the recording medium 300 in the buffer 15, and the ADPCM data stored in the buffer 15 becomes a sound source.
[0059]
  Also, the audio processor 11 reads ADPCM data from the buffer 15 based on, for example, a clock signal having a frequency of 44.1 kHz. The audio processor 11 performs processing such as pitch conversion, noise addition, envelope setting, level setting, and reverb addition on the read ADPCM data.
[0060]
  When the audio data read from the recording medium 300 is PCM (Pulse Code Modulation) data such as CD-DA (Compact Disk Digital Audio), the audio processor 11 converts the audio data into ADPCM data. Further, the processing for the PCM data by the program is directly performed on the main memory 5. The PCM data processed on the main memory 5 is supplied to the audio processor 11 and converted into ADPCM data. Thereafter, the various processes described above are performed, and sound is output from the speaker 23.
[0061]
  As the recording medium drive 17, for example, a DVD-ROM drive, a CD-ROM drive, a hard disk drive, an optical disk drive, a flexible disk drive, a silicon disk drive, a cassette medium reader, or the like is used. In this case, as the recording medium 300, a DVD-ROM, a CD-ROM, a hard disk, an optical disk, a flexible disk, a semiconductor memory, or the like is used.
[0062]
  The recording medium drive 17 reads image data, audio data, and program data from the recording medium 300 and supplies the read data to the decoder 12. The decoder 12 performs error correction processing by ECC (Error Correction Code) on the reproduced data from the recording medium drive 17 and supplies the data subjected to the error correction processing to the main memory 5 or the audio processor 11.
[0063]
  For example, a card-type memory is used as the memory 18. The card type memory is used for holding various game parameters at the time of interruption, such as holding the state at the time of interruption when the game is interrupted.
[0064]
  The controller 19 is an operation device used by the user to input various operation commands, and sends an operation signal corresponding to the user's operation to the CPU 1. The controller 19 includes a first button 19a, a second button 19b, a third button 19c, a fourth button 19d, an up key 19U, a down key 19D, a left key 19L, a right key 19R, and L1 buttons 19L1, L2. A button 19L2, an R1 button 19R1, an R2 button 19R2, a start button 19e, a select button 19f, a left stick 19SL and a right stick 19SR are provided.
[0065]
  The up direction key 19U, the down direction key 19D, the left direction key 19L, and the right direction key 19R are used, for example, to give the CPU 1 a command for moving a character or cursor up, down, left, or right on the screen of the television monitor 21. .
[0066]
  The start button 19e is used to instruct the CPU 1 to load a game program from the recording medium 300. The select button 19f is used to instruct the CPU 1 to make various selections related to the game program loaded from the recording medium 300 to the main memory 5.
[0067]
  The buttons and keys of the controller 19 except for the left stick 19SL and the right stick 19SR are turned on when pressed from the neutral position by an external pressing force, and return to the neutral position when the pressing force is released. It consists of an on / off switch that turns off.
[0068]
  The left stick 19SL and the right stick 19SR are stick-type controllers having almost the same configuration as a so-called joystick. This stick-type controller has an upright stick, and can be tilted over a 360 ° direction including front, rear, left and right with a predetermined position of the stick as a fulcrum. The left stick 19SL and the right stick 19SR are connected to the CPU 1 via the interface circuit 13 using the values of the x-coordinate in the left-right direction and the y-coordinate in the front-rear direction as the operation signals according to the tilt direction and tilt angle of the stick. To send.
[0069]
  The first button 19a, the second button 19b, the third button 19c, the fourth button 19d, the L1 button 19L1, the L2 button 19L2, the R1 button 19R1, and the R2 button 19R2 correspond to the game program loaded from the recording medium 300. Used for various functions.
[0070]
  Next, the general operation of the video game apparatus will be described. When the recording medium 300 is loaded in the recording medium drive 17, when a power switch (not shown) is turned on and the video game apparatus is turned on, the recording medium is recorded based on the operating system stored in the ROM 6. The CPU 1 instructs the recording medium drive 17 to read the game program from 300. As a result, the recording medium drive 17 reads image data, audio data, and program data from the recording medium 300. The read image data, audio data, and program data are supplied to the decoder 12, and the decoder 12 performs error correction processing on each data.
[0071]
  The image data that has been subjected to error correction processing by the decoder 12 is supplied to the decompression circuit 7 via the bus line 2. The image data that has been subjected to the expansion processing described above by the expansion circuit 7 is supplied to the drawing processor 10, and is written into the non-display area of the buffer 14 by the drawing processor 10. The audio data that has been subjected to the error correction processing by the decoder 12 is written into the buffer 15 via the main memory 5 or the audio processor 11. Program data that has been subjected to error correction processing by the decoder 12 is written into the main memory 5.
[0072]
  Thereafter, the CPU 1 advances the video game based on the game program stored in the main memory 5 and the content that the user instructs using the controller 19. In other words, the CPU 1 appropriately performs control of image processing, control of sound processing, control of internal processing, and the like based on contents that the user instructs using the controller 19.
[0073]
  As image processing control, for example, the calculation of the coordinates of each skeleton or the calculation of the vertex coordinate data of polygons from the pattern data corresponding to the animation instructed to the character, the obtained three-dimensional coordinate data and the graphics data of the viewpoint position data Supply to the generation processor 3, issue of a rendering command including address data and luminance data on the display area of the buffer 14 obtained by the graphics data generation processor 3 are performed.
[0074]
  As control of audio processing, for example, issue of an audio output command to the audio processor 11, specification of level, reverb, etc. are performed. As control of the internal processing, for example, calculation according to the operation of the controller 19 is performed.
[0075]
  Next, a video game executed based on the game program recorded on the recording medium 300 will be described. The video game in the present embodiment is about fishing. A video game progresses when a character imitating a fisherman operated by a user fishes at a fishing spot provided in a virtual three-dimensional space. In a video game about fishing, ponds, lakes, seas, etc. are reproduced. The purpose of the three-dimensional image processing in the present embodiment is to give the user a sense of reality as if he is fishing at an actual fishing spot by realistically reproducing the water surface such as a pond, a lake, and the sea. .
[0076]
  FIG. 2 is a block diagram showing the main functions of the video game apparatus shown in FIG. As shown in FIG. 2, the video game apparatus functionally includes a program execution unit 31, a data storage unit 32, a program storage unit 33, a drawing processing unit 34, a display unit 35, and an operation unit 36.
[0077]
  The data storage unit 32 includes the buffer 14 and the like, and includes a model data storage unit 47. The model data storage unit 47 includes a water surface model storage unit 471 and a background model storage unit 472.
[0078]
  The water surface model storage unit 471 stores each data of the water surface model representing the water surface such as a pond, a lake, and the sea reproduced in the virtual three-dimensional space. The water surface model is composed of a plurality of polygons. Each data of the water surface model stored in the water surface model storage unit 471 includes model data defining polygons constituting the water surface model, animation data for causing the water surface model to move, pattern data indicating the contents of each animation, texture data, and color Stores palette data and the like. Note that the water surface model does not necessarily need to be moved, and animation data or the like is not necessary when the water surface model is not moved.
[0079]
  The background model storage unit 472 stores each data of a background model representing a background arranged around a water surface such as a pond, a lake, and the sea reproduced in a virtual three-dimensional space. The background model is composed of a plurality of polygons. Note that the background model includes a model representing land located around the water surface model, a model representing trees, a model representing bridges, a model representing sky, and the like. Each data of the background model stored in the background model storage unit 472 includes model data defining polygons constituting the background model, animation data for causing the background model to move, pattern data indicating the contents of each animation, texture data, and color Stores palette data and the like. Note that the background model does not necessarily need to be moved, and animation data or the like is not necessary when the background model is not moved. The background model storage unit 472 stores a water bottom model that is arranged below the water surface model in the virtual three-dimensional space and represents the topography of the water bottom.
[0080]
  The program execution unit 31 includes a CPU 1 and the like, and the CPU 1 and the like execute a three-dimensional image processing program stored in the main memory 5, whereby a game progress processing unit 41, a reverse image creation unit 42, a transparency changing unit 43, It functions as the texture pasting unit 44, the drawing instruction unit 45, and the display control unit 46.
[0081]
  The game progress processing unit 41 receives the operation of the controller 19 by the user and performs a normal fishing game progress process based on an operation signal output from the operation unit 36. That is, the user moves the character or performs a predetermined fishing operation by operating the controller 19.
[0082]
  The inverted image creation unit 42 creates an image obtained by drawing the background model stored in the background model storage unit 472 and vertically inverted as an inverted image, and temporarily stores it in the data storage unit 32.
[0083]
  The transparency changing unit 43 changes the transparency of the water surface model in a predetermined transparency changing region set based on the virtual camera viewpoint in the virtual three-dimensional space. The transparency changing area will be described later with reference to FIG. Moreover, transparency here represents the ratio which light permeate | transmits a substance, and a substance may be any of gas, a liquid, and solid. When the transparency is high, light is transmitted, and when the transparency is low, the light is reflected.
[0084]
  The texture pasting unit 44 pastes the texture on the water surface model whose transparency has been changed by the transparency changing unit 43. Here, the texture pasted on the water surface model is the reverse image created by the reverse image creation unit 42, and the texture pasting unit 44 reads the reverse image temporarily stored in the data storage unit 32 and reads the texture. As a paste on the water surface model.
[0085]
  The drawing instruction unit 45 issues a drawing command for drawing the water surface model with the texture attached by the texture attaching unit 44 on the background image to the drawing processing unit 34.
[0086]
  The display control unit 46 displays the water surface model drawn by the drawing processing unit 34 on the display unit 34.
[0087]
  The program storage unit 33 includes the recording medium drive 17 and the like, and includes a computer-readable recording medium 48. The recording medium 48 includes a recording medium 300 and stores an image display program as a video game program. The video game program also includes a control program for controlling the movement of the character and display data relating to the displayed character and object. When the image display program is read from the recording medium 48 and the program is recorded in the main memory 5, the main memory 5 functions as the program storage unit 33.
[0088]
  The drawing processing unit 34 includes the drawing processor 10 and the like, and draws a predetermined image based on a drawing command issued from the drawing instruction unit 45. The display unit 35 includes the television monitor 21 and the like. The operation unit 36 includes the controller 19 and the like.
[0089]
  In the present embodiment, the transparency changing unit 43 corresponds to a transparency changing unit, the inverted image creation unit 42 and the texture applying unit 44 correspond to a texture applying unit, and the drawing instruction unit 45 and the drawing processing unit 34 are drawing units. It corresponds to.
[0090]
  FIG. 3 is a schematic diagram for explaining the transparency changing region. The virtual three-dimensional space in the present embodiment includes a transparency changing region TR, an opaque region FR, and a background region HR. The transparency changing region TR that can change the transparency of the water surface model is perpendicular to a plane including an arbitrary vertex W (Wx, Wy, Wz) of the polygon constituting the water surface model from the virtual camera viewpoint C (Cx, Cy, Cz). It is a circular shape with the lowered point as the center point O (Cx, Wy, Cz). The radius a which is the distance from the center point O to the outer edge L of the transparency changing region TR can be obtained by the following equation (1).
  a = (Cy−Wy) / tan θ (1)
  Here, a represents the radius of the transparency changing region TR, Cy represents the y coordinate of the virtual camera viewpoint C, and Wy represents the y coordinate of the center point O of the transparency changing region TR (an arbitrary vertex W of the polygon constituting the water surface model). Y represents the angle formed by the virtual camera viewpoint C, the point P on the x-axis of the outer edge L of the transparency changing region TR, and the center point O of the transparency changing region TR. The angle θ is the angle of the line of sight that totally reflects.
[0091]
  Further, the distance b from the center point O of the transparency changing region TR to the arbitrary vertex W of the polygon constituting the water surface model can be obtained by the following equation (2).
  b = {(Cx−Wx)²+ (Cz-Wz)²}^1/2(2)
  Here, b represents the distance from the center point O of the transparency changing region TR to an arbitrary vertex W of the polygon constituting the water surface model, Cx represents the x coordinate of the virtual camera viewpoint C, and Wx represents the polygon constituting the water surface model. Represents the x coordinate of the arbitrary vertex W of C, Cz represents the z coordinate of the virtual camera viewpoint C, and Wz represents the z coordinate of the arbitrary vertex W of the polygon constituting the water surface model.
[0092]
  A ratio b / a between the radius a of the transparency changing region TR and the distance b from the center point O of the transparency changing region TR to an arbitrary vertex W of the polygon constituting the water surface model is set as the transparency coefficient α ′. The transparency coefficient α ′ is set to 0.0 ≦ α ′ ≦ 1.0, and becomes transparent when α ′ = 0.0, and becomes opaque when α ′ = 1.0. The transparency coefficient α ′ in the present embodiment is a value that represents the transparency of a substance such as water. The polygon model is transparent when the transparency coefficient α ′ is small, and the polygon model is opaque when the value is large. Become. Accordingly, the transparency coefficient α ′ decreases as the transparency increases, and the transparency coefficient α ′ increases as the transparency decreases. Further, it may be opaque when the transparent coefficient α ′ = 0.0, and transparent when the transparent coefficient α ′ = 1.0.
[0093]
  The opaque region FR that can make the water surface model opaque is lowered vertically from the virtual camera viewpoint C (Cx, Cy, Cz) to a plane including an arbitrary vertex W (Wx, Wy, Wz) of the polygon constituting the water surface model. It is a donut shape obtained by removing the transparency changing region TR from a circular shape having a point as the center point O (Cx, Wy, Cz), and the transparency is opaque and is set to reflect (that is, α ′ = 1.0). Is done.
[0094]
  The background region HR is a center point O (Cx) that is a point that drops vertically from a virtual camera viewpoint C (Cx, Cy, Cz) to a plane that includes an arbitrary vertex W (Wx, Wy, Wz) of the polygon that forms the water surface model. , Wy, Cz) is a donut shape obtained by removing the transparency changing region TR and the opaque region FR from the circular shape, and is a region including a background model. Texture is pasted on the polygons constituting the water surface model in the transparency changing region TR and the opaque region FR.
[0095]
  Note that the opaque region FR and the background region HR do not have to be circular as shown in FIG. 3, but may have a shape corresponding to the polygons forming the background model and the polygons forming the water surface model.
[0096]
  In the present embodiment, the water surface model includes the transparency changing region TR and the opaque region FR. However, the present invention is not particularly limited to this, and the water surface model does not include the opaque region FR and includes only the transparency changing region TR. The aspect containing may be sufficient. In this case, the shape of the water surface model and the shape of the transparency changing region TR are made the same.
[0097]
  Here, the distance b includes the square root as shown in the above equation (2). Since operations including the square root take time to process, it may be difficult to generate an image in real time. For this reason, in the present embodiment, the square value of the distance b is set as B as shown in the following equation (3), and the square value A of the radius a of the transparency changing region TR as shown in the following equation (4). And the ratio B / A between the square point B of the distance b from the center point O of the transparency changing region TR to the arbitrary vertex W of the polygon constituting the water surface model as the transparency coefficient α, the above (2) The calculation is performed without using the square root calculation shown in the equation.
[0098]
  B = b²= (Cx-Wx)²+ (Cz-Wz)².... (3)
  Where B represents the square value of the distance b from the center point O of the transparency changing region TR to an arbitrary vertex W of the polygon constituting the water surface model, Cx represents the x coordinate of the virtual camera viewpoint C, and Wx represents the water surface model. Represents the x coordinate of the arbitrary vertex W of the polygon that constitutes, Cz represents the z coordinate of the virtual camera viewpoint C, and Wz represents the z coordinate of the arbitrary vertex W of the polygon that constitutes the water surface model.
[0099]
  α = B / A = {(Cx−Wx)²+ (Cz-Wz)²} / {(Cy-Wy) / tan θ}².... (4)
  Where α is a value representing the transparency of the vertex of the polygon model constituting the water surface model, and B is a square value of the distance b from the center point O of the transparency changing region TR to an arbitrary vertex W of the polygon constituting the water surface model. A represents the square value of the radius a of the transparency changing region TR. Further, the transparency coefficient α is set to 0.0 ≦ α ≦ 1.0, and is transparent when α = 0.0, and opaque when α = 1.0.
[0100]
  The transparency coefficient α in the present embodiment is a value representing the transparency of a substance such as water, and the polygon model is transparent when the transparency coefficient α is small, and the polygon model is opaque when the value is large. Therefore, the transparency coefficient α decreases as the transparency increases, and the transparency coefficient α increases as the transparency decreases. Further, it may be opaque when the transparency coefficient α = 0.0 and transparent when the transparency coefficient α = 1.0.
[0101]
  A circular transparency changing region TR having a center point O as a point descending from a virtual camera viewpoint C in the virtual three-dimensional space perpendicularly to a plane including an arbitrary vertex W of the polygon constituting the water surface model is set. Then, the transparency of the vertexes of the polygons constituting the water surface model is lowered from the center point O toward the outer edge of the transparency changing region TR. In this way, the transparency coefficient α of the vertices of the polygons constituting the water surface model radially from the center point O toward the outer edge of the transparency changing region TR increases, so that the vertices of the polygons near the virtual camera viewpoint C are The transparency coefficient α becomes smaller and can be drawn through the water surface model, and the vertex of the polygon far from the virtual camera viewpoint C has a larger transparency coefficient α and is reflected and drawn without passing through the water surface model. can do.
[0102]
  In addition, the Fresnel effect can be realized by the Fresnel formula. However, when the calculation is performed using the Fresnel formula, the formula is complex, so the computation processing takes time and the load on the arithmetic processing unit is large. turn into. Therefore, the water surface model is configured with the square value A of the distance a to the outer edge of the transparency changing region TR having the center point O as the point lowered from the virtual camera viewpoint in the virtual three-dimensional space to the plane including the water surface model. Transparency is calculated based on the ratio B / A of the square value B of the distance b between an arbitrary vertex of the polygon and the center point O of the transparency changing region TR. In this way, by changing the transparency of the water surface model in the transparency changing region TR in accordance with the distance from the center point O of the transparency changing region TR, a pseudo Fresnel effect can be realized.
[0103]
  Further, the distance b between the arbitrary point W in the transparency changing region TR and the center point O of the transparency changing region TR is expressed by the square root by the coordinate value representing the arbitrary point W, but the square value B of the distance b and the distance By calculating a ratio B / A of a to the square value A, b / a (b includes a square root) can be obtained equivalently, and it is not necessary to perform square root calculation processing, and time required for calculation processing Can be shortened, and the load on the arithmetic processing unit can be reduced.
[0104]
  FIG. 4 is a flowchart showing an example of three-dimensional image processing by the video game apparatus shown in FIG. Note that the 3D image processing shown in FIG. 4 is processing performed by the CPU 1 or the like executing a 3D image processing program or the like stored in the recording medium 300.
[0105]
  In step S1, the CPU 1 issues a drawing command for drawing the background model arranged around the water surface model upside down to the drawing processor 10, and the drawing processor 10 inverts the background model upside down. Draw.
[0106]
  In step S <b> 2, the CPU 1 temporarily stores the drawn reverse image as texture data in the non-display area of the buffer 14.
[0107]
  In step S <b> 3, the CPU 1 issues a drawing command for drawing the background model to the drawing processor 10, and the drawing processor 10 draws the background model and develops it in the display area of the buffer 14.
[0108]
  In step S4, the CPU 1 issues a drawing command for drawing a bottom model placed below the water surface model in the virtual three-dimensional space to the drawing processor 10, and the drawing processor 10 draws the bottom model, and the buffer 14 Expands to the display area.
[0109]
  In step S5, the CPU 1 calculates the transparency coefficient α of the vertices of each polygon according to the drawing order of the polygons constituting the water surface model. The transparency coefficient α is a ratio B between the square value A of the radius a of the transparency changing region TR and the square value B of the distance b from the center point O of the transparency changing region TR to an arbitrary vertex W of the polygon constituting the water surface model. It is calculated by obtaining / A.
[0110]
  In step S <b> 6, the CPU 1 determines whether or not the transparency coefficient α has been set for all the vertices of the polygon constituting the water surface model. If it is determined that the transparency coefficient α has been set for all vertices (YES in step S6), the process proceeds to step S7. If it is determined that the transparency coefficient α is not set for all the vertices (NO in step S6), the process returns to step S5.
[0111]
  In step S <b> 7, the CPU 1 reads the texture data (upside down image of the background model) stored in the buffer 14 and pastes it as the texture of the water surface model. At this time, the transparency of the texture is set according to the transparency coefficient α of each vertex of the polygon constituting the water surface model calculated in step S5, and the transparency between each vertex is set by interpolation.
[0112]
  In step S8, the CPU 1 issues a drawing instruction to the drawing processor 10 to synthesize and draw the water surface model to which the upside-down inverted image of the background model is pasted on the background image. An image obtained by synthesizing the background model and the water bottom model is drawn and developed in the display area of the buffer 14.
[0113]
  In step S <b> 9, the CPU 1 controls the television monitor 21 to display an image obtained by combining the water surface model, the background model, and the water bottom model developed in the display area of the buffer 14. An image synthesized with the background image is displayed.
[0114]
  In this way, the pasted texture is displayed transparently when the water surface model has a high degree of transparency (where the transparency coefficient α is small), and the pasted texture when the part where the transparency is low (the part where the transparency coefficient α is large). Is reflected and displayed. That is, the transparency of the polygon constituting the water surface model changes according to the distance from the virtual camera viewpoint, and the polygon of the water surface model near the virtual camera viewpoint has a transparency coefficient α (= B / A) close to 0.0, The bottom of the water is displayed through the water surface. On the other hand, as the distance from the virtual camera viewpoint is increased, the polygon of the water surface model has a transparency coefficient α close to 1.0, and the vertically inverted background is gradually reflected and displayed, and the water bottom is not displayed. Therefore, by increasing the transparency of polygons close to the virtual camera viewpoint and decreasing the transparency as it moves away from the virtual camera viewpoint, the Fresnel effect can be realized in a pseudo manner, creating a realistic video game. Can be realized.
[0115]
  In addition, a background model placed around a water surface model composed of a plurality of polygons is drawn, and an image obtained by inverting the drawn image upside down is pasted to the water surface model as a texture. It is possible to reflect the surrounding background in the water surface model.
[0116]
  Furthermore, since the vertically inverted image is used as the texture of the water surface model, the fluctuation of the water surface can be easily expressed by moving the polygons constituting the water surface model based on the animation data.
[0117]
  FIG. 5 is a screen diagram illustrating an example of a game screen in which a water surface model is drawn by the three-dimensional image processing in the present embodiment. On the game screen 400 shown in FIG. 5, a land 402 as a background is displayed above, a water surface 401 of a lake is displayed below the land 402, and displayed as if a character 403 is standing on the water 401 for convenience. Has been. On the water surface 401, aquatic plants 406 and rocks 407, which are part of the topography constituting the water bottom model, are transmitted and displayed. A virtual camera viewpoint C provided at an arbitrary position in the virtual three-dimensional space is provided at a position overlooking the water surface 401. As shown in FIG. 5, in the region 404 on the near side of the screen of the water surface 401, the transparency of the polygons forming the water surface model is high (transparency coefficient α is small). Is displayed. The transparency of the polygons that make up the water surface model gradually decreases from the region 404 near the screen of the water surface 401 to the region 405 at the back of the screen, and the water surface model of the region 405 at the back of the screen of the water surface 401 is formed. Since the transparency of the polygon to be displayed is low (transparency coefficient α is large), the land 402 and the sky (not shown) as the background are reflected and displayed. The transparency in the region 404 on the back side of the screen 401 from the front surface of the water surface 401 shifts in the order of transparent, translucent, and opaque.
[0118]
  In this way, the near-view polygons are displayed transparently from the viewpoint of the virtual camera, and the distant view polygons are displayed with the background reflected, so that the Fresnel effect can be realized in a pseudo manner, and the user has a realistic feeling. You will be able to play video games.
[0119]
  In the present embodiment, the inverted image obtained by inverting the background model upside down is pasted as a texture on the transparency change region TR and the opaque region FR of the water surface model. However, the present invention is not particularly limited to this, and the transparency change Different textures may be attached to the region TR and the opaque region FR, respectively. A predetermined texture may be attached to the transparency changing region TR, and an inverted image obtained by inverting the background model upside down may be attached to the opaque region FR as a texture. In this case, the predetermined texture is an image representing water such as light blue.
[0120]
  Further, in the present embodiment, the transparency changing region TR has been described as a circular shape, but the present invention is not particularly limited thereto, and may be any shape such as an elliptical shape, a polygonal shape such as a rectangular shape, for example. . When the transparency changing region TR is elliptical, the transparency coefficient α is calculated using the radius in the longitudinal direction of the ellipse as the distance a from the center point to the outer edge. When the transparency changing region TR is polygonal, the transparency coefficient α is calculated with the distance from the center point to the longest vertex as the distance a from the center point to the outer edge.
[0121]
  In this embodiment, a model composed of a plurality of polygons has been described as a water surface model representing a water surface. However, the present invention is not particularly limited to this, and represents a transparent substance that causes transmission and reflection simultaneously. As long as it is a model, for example, a model representing glass or a model representing gemstones may be used. That is, the polygon constituting the model is a polygon used for expressing a transparent material in the virtual world in the virtual three-dimensional space.
[0122]
  In the present embodiment, the transparency changing unit 43 changes the transparency according to the distance from the center point of the transparency changing region TR. However, the present invention is not particularly limited to this, and the transparency coefficient α is a predetermined value. The transparency may be changed when the value becomes. For example, all vertices W at which the transparency coefficient α is less than 0.5 (0.0 ≦ α <0.5) are set to α = 0.0, and the transparency coefficient α is a value greater than 0.5 (0 .5 ≦ α ≦ 1.0), the degree of transparency is changed. In this case, since the bottom of the water is displayed in a wider range through the water surface in the near view, the user can know the state of the bottom of the water, which is suitable for a video game on fishing.
[0123]
  In the present embodiment, the video game has been described as a fishing game. However, the present invention is not particularly limited to this, and other sports games, action games, simulation games, shooting games, role playing games, and fighting games. It can also be applied to other video games.
[0124]
【The invention's effect】
  According to the first aspect of the present invention, since the transparency of the model in the predetermined area is changed and rendered, the transparency of the polygon located at a position close to the virtual camera viewpoint is increased and the model is separated from the virtual camera viewpoint. Therefore, by reducing the transparency, the Fresnel effect can be realized in a pseudo manner, and a realistic video game can be realized.
[0125]
  AlsoThe center point is the intersection point that is perpendicular to the plane including the region from the virtual camera viewpoint in the virtual three-dimensional space, and the transparency of the model is reduced radially from the center point. Therefore, polygons close to the virtual camera viewpoint can be drawn with high transparency, and polygons far from the virtual camera viewpoint can be drawn with low transparency, which simulates the Fresnel effect. It can be realized, and a realistic video game can be realized.
[0126]
  further, The square value of the distance from the center point to the outer edge of the region centered on the point perpendicular to the model from the virtual camera viewpoint in the virtual three-dimensional space, and a plurality of the models in the region from the center point of the region Since the transparency of each vertex is calculated based on the ratio to the square value of the distance to each vertex of the polygon, the transparency of the model in the region can be changed according to the distance from the center point of the region. In addition, the distance from the center point of the area to the vertices of the polygons that make up the model in the area is expressed as a square root by the coordinate value representing an arbitrary point, but the square of the distance from the center point of the area to the outer edge The distance from the center point of the region to the outer edge and the center of the region equivalently by calculating the ratio of the value and the square value of the distance from the center point of the region to the vertices of the polygons that make up the model in the region The ratio of the distance from each point to the vertices of a plurality of polygons constituting the model in the region can be obtained, so that it is not necessary to perform the square root calculation process, and the time required for the calculation process can be shortened.
[0127]
  Claim2According to the present invention, a background model arranged around a model composed of a plurality of polygons is drawn, and an image obtained by inverting the drawn image upside down is a model positioned in a predetermined region as a texture. Since it is pasted, the surrounding background can be reflected in the model provided in the virtual three-dimensional space. In addition, by making the near view transparent and capturing the background in the distant view, a pseudo Fresnel effect can be realized, and the realism increases.
[0128]
  Claim3According to the present invention described in the above, among the regions including the transparency changing region that can change the transparency of the model and the opaque region that can make the model opaque, the transparency is changed in the transparency changing region, and the opaqueness outside the transparency changing region. In the area, it is possible to paste an image obtained by rendering the background model upside down by making it opaque without changing the transparency, as a texture. Therefore, it is possible to clearly reflect the surrounding background on the model located away from the viewpoint of the virtual camera, to realize a pseudo Fresnel effect, and to increase the realism.
[0129]
  Claim4According to the present invention described in the above, since the transparency of the model in the predetermined area is changed and rendered, the transparency of the polygon located near the virtual camera viewpoint is increased, and the transparency is increased as the distance from the virtual camera viewpoint is increased. By lowering it, the Fresnel effect can be realized in a pseudo manner, and a realistic video game can be realized.
[0130]
  Claim5According to the present invention described in the above, since the transparency of the model in the predetermined area is changed and rendered, the transparency of the polygon located near the virtual camera viewpoint is increased, and the transparency is increased as the distance from the virtual camera viewpoint is increased. By lowering it, the Fresnel effect can be realized in a pseudo manner, and a realistic video game can be realized.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of a video game apparatus according to an embodiment of the present invention.
FIG. 2 is a block diagram showing main functions of the video game apparatus shown in FIG.
FIG. 3 is a schematic diagram for explaining a transparency changing region.
4 is a flowchart showing an example of three-dimensional image processing by the video game apparatus shown in FIG.
FIG. 5 is a screen diagram showing an example of a game screen in which a water surface model is drawn by three-dimensional image processing in the present embodiment.
FIG. 6 is a screen diagram showing an example of a game screen in which a water surface model is drawn by a conventional method that places importance on transparency.
FIG. 7 is a screen diagram showing an example of a game screen in which a water surface model is drawn by a conventional method that places importance on reflectivity.
[Explanation of symbols]
  1 CPU
  2 Bus lines
  3 Graphics data generation processor
  4,13 Interface circuit
  5 Main memory
  6 ROM
  7 Stretching circuit
  8 Parallel port
  9 Serial port
  10 Drawing processor
  11 Speech processor
  12 Decoder
  14, 15, 16 buffers
  17 Recording media driver
  18 memory
  19 Controller
  21 Television monitor
  31 Program execution part
  32 Data storage unit
  33 Program storage
  34 Drawing processor
  35 Display section
  36 Operation unit
  41 Game progress processing part
  42 Reverse image creation section
  43 Transparency change part
  44 Texture pasting part
  45 Drawing instruction part
  46 Display controller
  47 Model data storage
  48 Recording media
  471 Water surface model storage unit
  472 Background Model Storage Unit

Claims (5)

A three-dimensional image processing program for drawing a model composed of a plurality of polygons,
Transparency changing means for changing the transparency of the model in a predetermined area set based on a virtual camera viewpoint in a virtual three-dimensional space;
Texture pasting means for pasting a texture to the model whose transparency has been changed by the transparency changing means;
A video game device is caused to function as a drawing unit that draws the model with the texture pasted by the texture pasting unit,
The transparency changing means calculates transparency of each vertex of a plurality of polygons constituting the model in the predetermined area;
The texture pasting means sets the transparency of the texture according to the transparency of each vertex calculated by the transparency changing means, and complements and sets the transparency of the texture between the vertices ,
The region is centered on the intersection of a perpendicular line from the virtual camera viewpoint to the plane including the region and the plane,
The transparency changing means lowers the transparency from the center point toward the outer edge of the region, and constitutes the square value of the distance from the center point to the outer edge of the region, and the model in the region from the center point A three-dimensional image processing program that calculates the transparency of each vertex based on a ratio to the square value of the distance to each vertex of a plurality of polygons . 2. The three-dimensional image according to claim 1 , wherein the texture pasting unit pastes an image obtained by drawing a background model arranged around the model and upside down as a texture to the model located in the region. Image processing program. The region includes a transparency changing region that can change the transparency of the model, and an opaque region that can make the model opaque,
3. The texture pasting unit pastes an image obtained by drawing a background model arranged around the model and flipped upside down as a texture onto the model located in the opaque region. Dimensional image processing program. A three-dimensional image processing method for drawing a model composed of a plurality of polygons,
A transparency changing step in which the video game device changes the transparency of the model in a predetermined area set based on a virtual camera viewpoint in a virtual three-dimensional space;
A texture pasting step in which the video game device pastes a texture on the model whose transparency has been changed in the transparency changing step;
A video game device including a drawing step of drawing the model to which a texture is pasted in the texture pasting step;
The transparency changing step calculates transparency of each vertex of a plurality of polygons constituting the model in the predetermined region,
The texture pasting step sets the transparency of the texture according to the transparency of each vertex calculated in the transparency changing step, sets the transparency of the texture between the vertices ,
The region is centered on the intersection of a perpendicular line from the virtual camera viewpoint to the plane including the region and the plane,
In the transparency changing step, the transparency is lowered from the center point toward the outer edge of the region, and the square value of the distance from the center point to the outer edge of the region and the model in the region from the center point are configured. A method of processing a three-dimensional image, comprising: calculating transparency of each vertex based on a ratio to a square value of a distance to each vertex of a plurality of polygons . A video game device for drawing a model composed of a plurality of polygons,
Transparency changing means for changing the transparency of the model in a predetermined area set based on a virtual camera viewpoint in a virtual three-dimensional space;
Texture pasting means for pasting a texture to the model whose transparency has been changed by the transparency changing means;
Drawing means for drawing the model with the texture pasted by the texture pasting means;
Display means for displaying the model drawn by the drawing means,
The transparency changing means calculates transparency of each vertex of a plurality of polygons constituting the model in the predetermined area;
The texture pasting means sets the transparency of the texture according to the transparency of each vertex calculated by the transparency changing means, and complements and sets the transparency of the texture between the vertices ,
The region is centered on the intersection of a perpendicular line from the virtual camera viewpoint to the plane including the region and the plane,
The transparency changing means lowers the transparency from the center point toward the outer edge of the region, and constitutes the square value of the distance from the center point to the outer edge of the region, and the model in the region from the center point A transparency of each vertex is calculated based on a ratio with a square value of a distance to each vertex of a plurality of polygons .

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