JP2004121868A - Three-dimensional game device and method for image synthesis - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a three-dimensional game device which gives a sense of the passage of the time to a player and adds the variety to a game screen and a demonstration screen. <P>SOLUTION: A virtual time computing part 120 obtains a virtual time by calculating time passed in a virtual three-dimensional space on the basis of time passed in a real space. A virtual three-dimensional space calculating part 100 calculates positional information on displayed articles placed in the virtual three-dimensional space and on a light source such as the sun moving in the virtual three-dimensional space with the passage of the virtual time. A three-dimensional calculating part 210 performs a three-dimensional calculation including a shading calculation for the displayed articles placed in the virtual three-dimensional space on the basis of the positional information on the light source. Darkness of the night is expressed by a depth queuing calculation, and the moon, or the like, disappearing in the sky is expressed by a translucence calculation. If there are a plurality of game stages with different game settings, the virtual time at the end of the first game state is continued in the next game stage. The virtual time lapses during the display of a demonstration screen. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a three-dimensional game apparatus and an image composition method that can synthesize a view image from an arbitrary viewpoint in a virtual three-dimensional space.

In game devices, various ideas have been applied to make a game screen displayed on a display or the like closer to the real world and to create a so-called virtual reality world. If such a virtual reality world can be realized, the reality of the game world can be enhanced and the fun of the game can be greatly improved.
JP 06-277365 A JP 04-358291

Now, in order to realize the virtual reality world, it is desirable to introduce the concept of time to the game world.

In a two-dimensional game device in which a two-dimensional game screen is displayed on a display or the like, for example, in order to make the player feel the passage of time, the entire screen is brightened on the day game screen and dark on the night game screen. Such a method can also be adopted. In this method, for example, a plurality of palettes for game screen formation are prepared, a palette that makes the colors used for game display bright in the daytime scene is selected, and in the night scene, the entire color is selected. Select a palette to make it darker. However, this method can only express the entire screen brighter or darker. Therefore, it is not possible to express the change in the color of the sky, such as the sun whose position changes over time, or the darker the farther the night is. For this reason, the game world that is expressed is still less realistic.

Further, for example, in a martial arts game, the player selects the game characters 230 and 232 in FIG. 20A, instructs the operation of the game characters 230 and 232 while viewing the game screen as shown in FIG. Let game characters fight each other. In this case, the type of game stage displayed varies depending on the type of the selected game character. For example, if the opponent is a person from country A, a building 234 made in country A, a spectator 236 from country A, etc. are placed on the game stage, and the player feels that they are actually fighting in country A. Can be provided to the player. Then, when the player defeats the opponent in country A, the game proceeds to the next game stage, and in the next game stage, this time battles with the opponent in country B. And the next game stage is a stage representing Country B. In this way, the player moves to the next game stage sequentially by defeating the opponent one after another.

Now, in such a game apparatus having a plurality of game stages, the time setting is fixed for each game stage, such that a certain game stage represents a night scene and a certain game stage represents a day scene. Therefore, one game stage does not become a night stage or a day stage, and the variety of game stages is poor.

In addition, a racing car game or the like is also known as a game apparatus having a plurality of stages. In this racing car game, time can be expressed by going to night or noon when driving a certain distance, but if the racing car does not move forward, the time does not elapse. In other words, the passage of time largely depends on the player's operation, the game result, etc., and it is impossible to realize the expression that only the time flows regardless of the player's operation. For this reason, the player cannot feel the flow of time, and there is still a lack of realism.

Moreover, even if the passage of time in one game stage can be expressed, the start point of the game stage is always fixed, for example, at night and always at noon, and the variety of game stages is poor. Furthermore, the trajectory or the like of the sun should actually be different between the case where the game stage is placed on the South Pole, for example, and the stage placed on the equator. However, this is not considered at all in the conventional game apparatus.

Also, in game machines for commercial use, a demo screen is often displayed while the player is not playing a game. However, in the conventional game device, the flow of time is not expressed even in this demonstration screen, and the variety of the demonstration screen cannot be increased. In addition, when the demo screen is displayed, for example, when a coin is inserted, the game starts, but there is a problem that the game screen displayed at the start of the game is always fixed, for example, at night or always at daytime. .

Suppose also that a celestial body such as a moon or a star is represented on a game screen in a martial art game or the like. In this case, it is relatively easy to express that a celestial body appears at night and does not appear at noon. However, it is not easy to realize the expression that the celestial body gradually appears as the sky gets darker and gradually disappears when the sky becomes brighter, and there is also a problem of how to achieve this with a simple method .

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a three-dimensional game apparatus and an image composition method that can make a player feel a sense of passage of time. Is to provide.

Another object of the present invention is to provide a three-dimensional game apparatus and an image composition method capable of increasing the variety of game screens expressed in each of a plurality of game stages.

Another object of the present invention is to provide a three-dimensional game apparatus and an image composition method capable of expressing the passage of time even when the game is not being played.

Another object of the present invention is to provide a three-dimensional game apparatus and an image composition method capable of expressing a display object that gradually disappears or gradually appears as the brightness changes over time.

(1) The present invention is a three-dimensional game apparatus having a plurality of game stages with different game settings, while synthesizing and displaying a view image from an arbitrary viewpoint in a virtual three-dimensional space.
Virtual time calculation means for calculating the elapsed time in the virtual three-dimensional space based on the elapsed time in the real space and obtaining the virtual time;
Means for calculating at least position information of a display object arranged in the virtual three-dimensional space;
Three-dimensional calculation means for performing a three-dimensional calculation including a shading calculation on a display object arranged in the virtual three-dimensional space based on the calculated virtual time;
The three-dimensional calculation means
Changing the contents of the three-dimensional calculation performed on the display object in accordance with the movement of the game stage arrangement position when the game scene moves from one game stage to the next game stage in the plurality of game stages. It is characterized by.

(2) The three-dimensional game apparatus of the present invention
The content of the three-dimensional calculation is changed by changing the position of the light source used for the three-dimensional calculation with the movement of the game stage arrangement position.

(3) The present invention is a three-dimensional game apparatus that synthesizes a view field image from an arbitrary viewpoint in a virtual three-dimensional space and displays it on a player.
Virtual time calculation means for calculating the elapsed time in the virtual three-dimensional space based on the elapsed time in the real space and obtaining the virtual time;
Means for calculating at least position information of a display object arranged in the virtual three-dimensional space;
Three-dimensional calculation means for performing a three-dimensional calculation including a shading calculation for a display object arranged in the virtual three-dimensional space based on the calculated virtual time;
The virtual time calculating means is
The calculation for causing the virtual time to elapse while the player is not playing the game is also characterized.

(4) The three-dimensional game device of the present invention
A demo screen is displayed when the player is not playing a game, and the display content of the demo screen is changed with the passage of the virtual time.

(5) The three-dimensional game device of the present invention
It is characterized in that at least one of the environmental light and the light of the light source used in the three-dimensional calculation is changed with the passage of the virtual time.

(6) The three-dimensional game device of the present invention
Depth cueing calculating means for calculating the color of the display object to be close to a predetermined color by color interpolation is provided, and the predetermined color to be approximated by color interpolation is changed with the passage of the virtual time.

(7) The three-dimensional game device of the present invention
When the virtual time has passed and the light from the light source used in the three-dimensional calculation does not reach the display object, another light source different from the light source is prepared and the light source is based on the different light source. A three-dimensional operation is performed.

(8) The three-dimensional game device of the present invention
Including translucent computing means for rendering the translucent display object by blending the color information of the background and the color information of the translucent display object,
The translucent computing means is:
When the light amount of the light source used in the three-dimensional calculation increases as the virtual time elapses, the ratio of the color information of the translucent display object to be blended is decreased, and when the light amount decreases, the ratio is increased. It is characterized by making it.

(9) The present invention is an image composition method for composing a view image from an arbitrary viewpoint in a virtual three-dimensional space and displaying it on a player, and displaying a plurality of game stages with different game settings,
A virtual time calculating step of calculating an elapsed time in the virtual three-dimensional space based on an elapsed time in the real space and obtaining a virtual time;
Calculating at least position information of a display object arranged in the virtual three-dimensional space;
A three-dimensional calculation step for performing a three-dimensional calculation including a shading calculation on a display object arranged in the virtual three-dimensional space based on the calculated virtual time,
In the three-dimensional calculation step,
Changing the contents of the three-dimensional calculation performed on the display object in accordance with the movement of the game stage arrangement position when the game scene moves from one game stage to the next game stage in the plurality of game stages. It is characterized by.

(10) The image composition method of the present invention includes:
The content of the three-dimensional calculation is changed by changing the position of the light source used for the three-dimensional calculation with the movement of the game stage arrangement position.

(11) The present invention is an image synthesis method for synthesizing a view field image from an arbitrary viewpoint in a virtual three-dimensional space and displaying it on a player.
A virtual time calculating step of calculating an elapsed time in the virtual three-dimensional space based on an elapsed time in the real space and obtaining a virtual time;
Calculating at least position information of a display object arranged in the virtual three-dimensional space;
A three-dimensional calculation step of performing a three-dimensional calculation including a shading calculation for a display object arranged in the virtual three-dimensional space based on the calculated virtual time,
In the virtual time calculating step,
The calculation for causing the virtual time to elapse while the player is not playing the game is also characterized.

(12) The image composition method of the present invention includes:
A demo screen is displayed when the player is not playing a game, and the display content of the demo screen is changed with the passage of the virtual time.

(13) The image composition method of the present invention includes:
It is characterized in that at least one of the environmental light and the light of the light source used in the three-dimensional calculation is changed with the passage of the virtual time.

(14) The image composition method of the present invention includes:
It includes a depth cueing calculation step for calculating the color of the display object close to a predetermined color by color interpolation, and the predetermined color to be approximated by color interpolation is changed according to the passage of the virtual time.

(15) The image composition method of the present invention includes:
When the virtual time has passed and the light from the light source used in the three-dimensional calculation does not reach the display object, another light source different from the light source is prepared and the light source is based on the different light source. A three-dimensional operation is performed.

(16) The image composition method of the present invention includes:
A translucent operation step for rendering the translucent display object by blending the color information of the background and the color information of the translucent display object,
In the translucent operation step,
When the light amount of the light source used in the three-dimensional calculation increases as the virtual time elapses, the ratio of the color information of the translucent display object to be blended is decreased, and when the light amount decreases, the ratio is increased. It is characterized by making it.

1. Features of the present embodiment In order to solve the above-described problems, the present embodiment is a three-dimensional game apparatus that synthesizes a view image from an arbitrary viewpoint in a virtual three-dimensional space and displays it on a player. There,
Virtual time calculation means for calculating the elapsed time in the virtual three-dimensional space based on the elapsed time in the real space and obtaining the virtual time;
Means for calculating at least position information of a display object arranged in the virtual three-dimensional space, the position information of a light source moving in the virtual three-dimensional space as the virtual time elapses based on the virtual time; Means for calculating
And a three-dimensional calculation means for performing a three-dimensional calculation including a shading calculation on a display object arranged in the virtual three-dimensional space based on the calculated position information of the light source.

According to the present embodiment, the virtual time is calculated based on the elapsed time in the real space, and the light source position such as the sun is obtained based on the virtual time. Based on the obtained position information of the light source, a three-dimensional calculation such as a shading calculation is performed. As a result, the virtual time elapses as the game time elapses, and the result of shading or the like by the shading calculation varies as the position of the light source moves. This makes it possible for the player to feel that time has passed.

In addition, the present embodiment is a three-dimensional game apparatus having a plurality of game stages with different game settings while synthesizing and displaying a view field image from an arbitrary viewpoint in a virtual three-dimensional space.
Virtual time calculation means for calculating the elapsed time in the virtual three-dimensional space based on the elapsed time in the real space and obtaining the virtual time;
Means for calculating at least position information of a display object arranged in the virtual three-dimensional space;
Three-dimensional calculation means for performing a three-dimensional calculation including a shading calculation on a display object arranged in the virtual three-dimensional space based on the virtual time,
The virtual time calculation means starts from the virtual time at the end of the one game stage when the game scene has shifted from one game stage to the next game stage of the plurality of game stages. The virtual time of the next game stage is calculated.

According to the present embodiment, when the game scene shifts from one game stage to the next game stage, the next game stage takes over the virtual time at the end of the one game stage. As a result, the game scene at the start of the next game stage changes depending on the time required for one game stage.

In addition, the present embodiment is a three-dimensional game apparatus having a plurality of game stages with different game settings while synthesizing and displaying a view field image from an arbitrary viewpoint in a virtual three-dimensional space.
Virtual time calculation means for calculating the elapsed time in the virtual three-dimensional space based on the elapsed time in the real space and obtaining the virtual time;
Means for calculating at least position information of a display object arranged in the virtual three-dimensional space;
Three-dimensional calculation means for performing a three-dimensional calculation including a shading calculation on a display object arranged in the virtual three-dimensional space based on the calculated virtual time;
The three-dimensional calculation unit performs the three-dimensional operation on the display object in accordance with the movement of the game stage arrangement position when the game scene moves from one game stage to the next game stage in the plurality of game stages. The content of the calculation is changed.

According to the present embodiment, when the game scene moves from one game stage to the next game stage and the position information such as the latitude at which the game stage is arranged changes, a three-dimensional calculation is performed along with this change. The contents are changed. Thereby, the player can feel the movement of the game stage.

Further, the present embodiment is characterized in that the contents of the three-dimensional calculation are changed by changing the position of the light source used for the three-dimensional calculation in accordance with the movement of the game stage position.

According to this embodiment, the position of the light source is changed with the movement of the position of the game stage, and the contents of the three-dimensional calculation such as the shading calculation are changed. Thereby, for example, when the latitude or the like of the game stage changes, the orbit of the sun or the like as the light source can be changed, the shading or the like on the display object is changed, and the player can feel the movement of the game stage. .

In addition, the present embodiment is a three-dimensional game apparatus that synthesizes a view image from an arbitrary viewpoint in a virtual three-dimensional space and displays it on a player.
Virtual time calculation means for calculating the elapsed time in the virtual three-dimensional space based on the elapsed time in the real space and obtaining the virtual time;
Means for calculating at least position information of a display object arranged in the virtual three-dimensional space;
Three-dimensional calculation means for performing a three-dimensional calculation including a shading calculation for a display object arranged in the virtual three-dimensional space based on the calculated virtual time;
The virtual time calculation means performs a calculation for causing the virtual time to pass even while the player is not playing a game.

According to the present embodiment, the virtual time elapses even when the player is not playing the game. Thereby, the game screen displayed at the time of the next game start can be various.

Further, the present embodiment is characterized in that a demo screen is displayed when the player is not playing a game, and the display content of the demo screen is changed with the passage of the virtual time.

According to the present embodiment, the virtual time elapses when the demonstration screen is displayed, and the display content of the demonstration screen is changed. This allows the passage of time to be expressed on the demo screen.

Further, the present embodiment is characterized in that at least one of the environmental light and the light of the light source used in the three-dimensional calculation is changed according to the passage of the virtual time.

According to the present embodiment, when the virtual time elapses by playing the game, the colors of the light source light and the ambient light change, and it is possible to make the player feel the passage of time due to the color change.

In addition, the present embodiment includes a depth cueing calculation unit that performs a calculation to bring the color of the display object close to a predetermined color by color interpolation, and changes the predetermined color to be approximated by color interpolation according to the passage of the virtual time. It is characterized by.

According to the present embodiment, when virtual time has elapsed by playing a game, depth cueing calculation is performed to bring the color of the display object closer to a predetermined color, thereby allowing the player to feel the passage of time. it can.

In the present embodiment, another light source different from the light source is prepared when the virtual time has passed and the light from the light source used in the three-dimensional calculation does not reach the display object. The three-dimensional calculation is performed based on the different light source.

According to the present embodiment, when the virtual time has elapsed by playing the game, another light source is prepared, and a three-dimensional calculation based on this other light source is performed, thereby causing the player to feel the passage of time. be able to.

Further, the present embodiment includes a translucent operation means for rendering a translucent display object by blending the background color information and the translucent display object color information,
The translucent computing means reduces the ratio of the color information of the translucent display object to be blended when the light quantity of the light source used in the three-dimensional computation increases as the virtual time elapses, and the light quantity is reduced. In some cases, the ratio is increased.

According to the present embodiment, when the light amount of the light source increases with the lapse of the virtual time, the ratio of the color information (luminance information of each RGB component) of the translucent display object to be blended decreases, and thereby translucent The display object can be integrated into the background. On the other hand, when the amount of light decreases, the ratio of color information to be blended increases, and a translucent display object that appears in the background or the like can be expressed.

2. First Embodiment FIG. 1 shows a block diagram of a first embodiment of the present invention. The first embodiment includes an operation unit 12, a virtual three-dimensional space calculation unit 100, a three-dimensional calculation unit 210, an image forming unit 228, and a display 10.

The operation unit 12 is used by the player to input an operation signal. The virtual three-dimensional space calculation unit 100 performs calculations for forming a virtual three-dimensional space based on a predetermined program and an operation signal from the operation unit 12. Specifically, in accordance with an operation signal from the operation unit 12, an operation for obtaining position information and direction information of a display object arranged in the virtual three-dimensional space every predetermined period, for example, every field is performed. The virtual three-dimensional space calculation unit 100 includes a virtual time calculation unit 120. The three-dimensional calculation unit 210 performs three-dimensional calculations such as coordinate conversion, perspective projection conversion, and shading calculation, and includes a shading calculation unit 213 and a depth cueing calculation unit 214. The image forming unit 228 performs a drawing process on the display object that has been subjected to the three-dimensional calculation by the three-dimensional calculation unit 210 and forms a view field image to be displayed on the display 10. This makes it possible to obtain a view field image from an arbitrary viewpoint in the virtual three-dimensional space.

In this embodiment, the virtual time calculation unit 120 calculates the virtual time. The calculation of the virtual time is performed based on the elapsed time in the real space (real world). For example, 30 seconds in the real world is 2 hours in the virtual three-dimensional space (game world). In the following, the case where this embodiment is applied to a martial arts game will be described as an example. 2A, 2B to 6A, 6B show an example of a game screen (view image) obtained by this embodiment.

In this embodiment, the time limit for a martial arts game is 2 hours (30 seconds in the real world), and every time the game is prolonged, the same stage changes from the morning scene (FIG. 2 (A)) to the day scene (FIG. 2). 3 (A)), transition from the day scene to the evening scene (FIG. 3B) and from the evening scene to the night scene (FIG. 4). As a result, the player who is playing the game can feel the passage of time. For example, in the morning scene of FIG. 2 (A), the sun 50 is rising toward the sky. The sun 50 moves almost directly in the daytime scene of FIG. 3A, and sinks toward the horizon in the evening scene of FIG. 3B. At this time, the position information of the sun is calculated based on the virtual time calculated by the virtual time calculation unit 120. That is, the sun moves on a predetermined trajectory with the passage of virtual time. In this embodiment, the moving sun is considered as a light source, and shading calculation is performed. This shading calculation is performed in the shading calculation unit 213. For example, in FIG. 2A, since the sun is located in the back direction toward the screen, the game characters 44a and 44b are shaded on the assumption that there is a light source in the back direction. In FIG. 3A, since the sun is located in the upper right direction toward the screen, the game characters 44a and 44b are shaded on the assumption that there is a light source in the upper right direction, and a shadow 56 is also formed. In FIGS. 2 (A) and 3 (A) (morning and noon), the ground 54 is brightly illuminated by the sun, but in FIGS. 3 (B) and 4 (evening and night). The ground 54 has a dark color.

In this embodiment, at least one of the ambient light and the light source used in the three-dimensional calculation unit 210 is changed according to the passage of virtual time. That is, in the evening, the light color is made red. This can represent sunset. Further, in this embodiment, the sky color is also changed with the passage of virtual time, and becomes pale in the morning of FIG. 2 (A), deep blue in the day of FIG. 3 (A), and evening in FIG. 3 (B). Then, it is red, and it is black at night in FIG. The sky color is calculated based on the color of the light source and the amount of light from the light source.

In this embodiment, the shape of the sun displayed on the game screen is also changed with the passage of virtual time. For example, FIG. 5A shows the shape of the sun 50 displayed in the daytime, and FIG. 5B shows the shape of the sun 50 displayed in the evening. Similarly, it is possible to express the moon phases.

In this embodiment, in order to make the player feel the passage of time, the method described below is also used. For example, FIG. 2B shows a game screen showing morning haze. This morning haze is expressed as follows. That is, a semi-transparent display object (semi-transparent polygon) is prepared to represent haze, and the translucent operation unit 246 performs arithmetic processing for blending the color information of the translucent display object and the color information of the background. .

In this embodiment, depth cueing calculation is also performed to express morning haze or night darkness. This depth cueing calculation is performed in the depth cueing calculation unit 214. For example, in the night scene of FIG. 4, the depth cueing calculation is performed so that the display color approaches black as it goes toward the back of the screen. Specifically, in FIG. 4, the color of the ground 54 approaches black as it goes to point A, point B, and point C. Note that the depth cueing calculation unit 213 may be provided in the image forming unit 228 instead of being provided in the three-dimensional calculation unit 210.

Also, in this embodiment, in order to effectively represent the night scene, if the light shifts to the night scene and the light from the sun does not reach the display object, another light source is prepared. Based on the shading calculation. That is, in FIG. 4, this separate light source is provided in the lower left direction of the screen. The game characters 44a and 44b are shaded based on the light from the separate light source, and a shadow 56 is also formed. As a result, the atmosphere of fighting in the darkness of the night can be expressed realistically. It is desirable to change the position and type of the light source to be prepared for each game stage. For example, in a grassy scene, a firefly flying in the night sky is used as a light source (moving light source), and in a harbor scene, a ship indicator is used as a light source. Can be.

Furthermore, in this embodiment, celestial bodies such as the moon, stars, constellations, and shooting stars are expressed as follows. FIG. 6A shows a moon 58 that appears at night. FIG. 6B shows a moon 58 that disappears in the morning when the sky brightens. In this embodiment, in order to express the moon 58 that disappears in the bright sky as described above, the moon 58 is made a translucent display object. Then, as described above, the translucent operation unit 246 performs an operation of blending the background (sky) color information and the color information of the moon 58 which is a translucent display object. In this case, when the amount of light such as the light source (sun) used in the three-dimensional calculation unit 210 increases in the morning due to the passage of virtual time, the ratio of the moon color information to be blended in the translucent calculation unit 246 is decreased. Let As a result, as shown in FIG. 6B, the moon 58 becomes transparent and disappears as the sky becomes brighter. On the other hand, when the amount of light approaches the night due to the passage of virtual time and the amount of light decreases, the proportion of color information of the moon to be blended is increased. As a result, the moon 58 gradually appears in the night sky. As described above, according to the present embodiment, the moon 58 is expressed more realistically by a simple method using a translucent operation. Similarly, constellations and shooting stars appearing in the night sky can be expressed.

As described above, in this embodiment, the player can feel the flow of time by using shading calculation or the like. However, in this embodiment, the virtual time passes regardless of the player's operation, the game result, and the like. There are features. This feature makes it possible for the player to feel the flow of time more realistically.

This example also has the following characteristics. For example, consider a case where the present embodiment is applied to a three-dimensional game apparatus having a plurality of game stages with different game settings. In a martial arts game or the like, the game stage is different if the opponent is different. When the opponent is defeated in the first game stage, the process shifts to the second game stage. In the first game stage and the second game stage, the scenery of the battle place is different, and the buildings and terrain are different. In this case, in this embodiment, the virtual time of the second game stage is calculated starting from the virtual time at the end of the first game stage. For example, in FIG. 7, the first game stage starts with a morning scene (FIG. 2A). Then, after the virtual time has passed, the scene shifts from morning to noon and from noon to evening. For example, in the evening scene, the player defeats the opponent and shifts to the second game stage. Then, as shown in FIG. 7, the second game stage starts from the evening scene (more precisely, the time when the first game stage is finished). When the second game stage ends at the daytime scene, the third game stage starts from the daytime scene, and when the third game stage ends at the nighttime scene, the fourth game stage starts from the nighttime scene. The

Conventionally, the time setting is fixed for each game stage, for example, the first stage starts in the morning and the second stage starts from noon. On the other hand, in the present embodiment, the game scene at the start of the second game stage changes depending on the time required to clear the game of the first game stage. For example, if it takes more time to clear the first game stage in FIG. 7, the second game stage starts from the night scene. As described above, the game start scene of each game stage changes variously depending on the game time of the player. Thereby, when the player plays the game next time, the game can be played with a feeling different from the previous game, and the variety and fun of the game can be greatly improved.

Further, in this embodiment, when the game stage is moved from one game stage to the next game stage and the arrangement position of the game stage is moved, the contents of the three-dimensional calculation applied to the display object are made different. For example, in FIG. 8A, the first game stage is arranged immediately below the equator, the third game stage is arranged near the North Pole, and the second game stage is arranged at a latitude between the equator and the North Pole. Then, as shown in FIG. 8B, the sun 50 is moved in the orbit A1 in the first game stage, in the orbit B1 in the second game stage, and in the orbit C1 in the third game stage. . Shading calculation and the like are also performed on the assumption that the light source moves on these trajectories. Therefore, for example, when a transition is made from the first game stage to the second game stage, the position of the sun as a light source at midday shifts further downward. As a result, the shading of the display object such as the game character is also different, and the shape of the shadow or the like formed is also different. Further, when the stage shifts to the third game stage, the orbit of the sun is further lowered, thereby enabling expression such as midnight sun. The change in the contents of the three-dimensional calculation accompanying the transition of the game stage is not only the change in the sun's orbit as the light source, but also the change in the color of the light source, shading calculation, depth cueing calculation, translucent calculation, for example. Various things are conceivable.

In this embodiment, the virtual time elapses at the same time as the power supply to the device is turned on. For example, in the case of an arcade game device, a demonstration screen or the like is displayed when the player is not playing a game. Is called. Then, when the player starts the game play by inserting coins or the like, the first game stage is displayed as shown in FIG. When the first and second game stages are completed and the player finishes the game, a demo screen is displayed again. In this embodiment, the virtual time elapses even while the player is not playing the game and the demonstration screen is displayed. This makes it possible to make various game screens displayed at the start of the next game. For example, in FIG. 9, the game stage starts in the morning scene or starts in the daytime, evening, or night scene depending on the scene in which the previous stage ends and the elapsed time of the demonstration screen. Therefore, it is possible to give various faces to one game stage, and the variety of game stages can be increased. Thereby, the player can play with a fresh feeling every time the game is played, and it is possible to provide a game apparatus that is interesting and timeless.

Furthermore, in this embodiment, the display content of the demonstration screen is also changed with the passage of virtual time. That is, on the demonstration screen, the sun as the light source moves and the morning, noon, evening, and night scenes are sequentially displayed. As a result, the passage of time in the demonstration screen or the like is also expressed using the expressive power of the screen instead of the numbers and the like, so that the fun of the game can be further increased.

3. Second Embodiment FIGS. 10 to 12 show block diagrams of a second embodiment of the present invention. The second embodiment shows an example of a specific configuration of the first embodiment. FIG. 10 shows a virtual three-dimensional space calculation unit 100, FIG. 11 shows a three-dimensional calculation unit 210, and FIG. An example of a specific configuration of the image forming unit 228 is shown.

FIG. 13 shows an example in which the second embodiment is applied to a commercial three-dimensional game apparatus installed in a game center or the like. As shown in FIG. 13, the three-dimensional game apparatus includes a display 10 on which a game screen (field-of-view image) is projected, an operation unit 12 on which a player performs a game operation, and speakers 40a and 40b on which game sound is output. The player looks at the game character displayed on the display 10 while listening to the game sound output from the speakers 40a, 40b. A game character is operated by the operation unit 12 to enjoy a battle game (a martial art game).

Next, the configuration of the present embodiment will be described with reference to the block diagrams shown in FIGS.

First, a specific configuration of the virtual three-dimensional space calculation unit 100 will be described with reference to FIG. The operation unit 12 includes a lever 20, a cut button 22, a kick button 24, and a throw button 26 (see FIG. 13), and an operation instruction signal according to the operation of these levers and buttons is sent to the virtual three-dimensional space calculation unit 100. Reportedly.

The virtual three-dimensional space calculation unit 100 operates in accordance with a predetermined program and an operation signal from the operation unit 12, and includes an input receiving unit 102, an operation determination unit 104, a state information storage unit 108, a virtual three-dimensional space setting. Unit 110, display object information storage unit 112, and virtual time calculation unit 120. The virtual three-dimensional space setting unit 110 includes an operation pattern generation unit 114.

The input receiving unit 102 receives an operation instruction signal from the operation unit 12. The action determining unit 104 determines what action the game character performs from the action instruction signal received by the input receiving unit 102 and the current game character state information stored in the state information storage unit 108. To do.

When the motion determination unit 104 determines the motion of the game character, the motion pattern generation unit 114 in the virtual three-dimensional space setting unit 110 generates the determined motion pattern. For example, when it is determined to perform an attack action with a sword by pressing the cut button 22, an action pattern is generated in which the action state of the game character changes from a ready state to a swinging sword state. .

The display object information storage unit 112 stores display object information on display objects such as the head, torso, limbs, or the sun, moon, stars, and buildings arranged around the game character. This display object information includes position information of the display object, direction information, and an object number for designating image information of the display object. FIG. 14 shows an example of the display object information. In this embodiment, these display objects are expressed by combining a plurality of polygons.

Based on the motion pattern generated from the motion pattern generation unit 114, the virtual three-dimensional space setting unit 110 stores the display object information stored in the display object information storage unit 112 every predetermined period, for example, every field (1/60 seconds). Update to The updated display object information is output to the three-dimensional calculation unit 210.

The virtual three-dimensional space setting unit 110 also updates display object information such as the sun, moon, and stars. In this case, the display object information is updated based on the virtual time calculated by the virtual time calculation unit 120. That is, the display object information is updated so that the display object such as the sun moves on a predetermined trajectory as the virtual time elapses. In this embodiment, the sun is used as a light source for performing shading calculation. Therefore, the position of the sun becomes the position of the light source. In this case, the sun as the light source is at infinity, and the light from the light source is a parallel light beam. Therefore, the incident angle of parallel rays from the light source, that is, the light source vector (light source angle) can be obtained based on the position information of the sun. Information on the light source vector is output to the three-dimensional calculation unit 210.

Next, a specific configuration of the three-dimensional calculation unit 210 will be described with reference to FIG. The three-dimensional calculation unit 210 includes an image information storage unit 212, a processing unit 215, a coordinate conversion unit 218, a vertex luminance calculation unit 219, a clipping processing unit 220, a perspective projection conversion unit 222, and a sorting processing unit 226.

The three-dimensional calculation unit 210 performs various three-dimensional calculation processes according to the virtual three-dimensional space setting information set by the virtual three-dimensional space calculation unit 100.

That is, first, as shown in FIG. 15, the image information of the display objects 300, 333, and 334 representing game characters, buildings, and celestial bodies is coordinate-converted from the local coordinate system to the world coordinate system (XW, YW, ZW). Processing is performed. Next, a process of converting the coordinates of the image information subjected to the coordinate conversion into a viewpoint coordinate system (Xv, Yv, Zv) based on the viewpoint of the player 302 is performed. These coordinate conversion processes are performed by the coordinate conversion unit 218. Thereafter, so-called clipping processing is performed by the clipping processing unit 220, and then perspective projection conversion processing to the screen coordinate system (XS, YS) is performed by the perspective projection conversion unit 222. Finally, a sorting processing unit 226 performs a sorting process if necessary.

In the present embodiment, display object information including position information, direction information, and object number is transferred from the virtual three-dimensional space calculation unit 100 to the processing unit 215. Then, the image information of the corresponding display object (object) is read from the image information storage unit 212 using the transferred object number as an address. In the image information storage unit 212, image information of a display object is expressed and stored as a set (polyhedron) of a plurality of polygons.

16A and 16B show an example of the format of data to be processed in the three-dimensional calculation unit 210. FIG. As shown in FIG. 16A, this data includes frame data, object data, and polygon data.

Here, the frame data includes data such as viewpoint information, viewing angle, light source vector, light quantity of light source, light source color, and ambient light. The object data is data including object position information, direction information, and other attached data. Polygon data is image information about polygons constituting the object, and includes vertex coordinates, vertex texture coordinates, vertex luminance information, and other attached data of the polygons as shown in FIG. The vertex luminance information can have RGB components separately.

The vertex luminance calculation unit 219 obtains vertex luminance information (luminance magnification) shown in FIG. 16B, and includes a shading calculation unit 213 and a depth cueing calculation unit 214.

The shading calculation unit 213 includes a normal vector (given to each vertex of the polygon) coordinate-converted to the world coordinate system by the coordinate conversion unit 218, a light source vector included in the frame data, a light amount of the light source, a light source color, ambient light, and the like. And a shading calculation based on an illumination model such as a Lumbard diffuse reflection model or a specular reflection model.

For example, when the shading calculation is performed using the Lambert diffuse reflection model, the following illumination model formula is used.

i = pa + pd × d

In the above equation, i is the intensity of light, pa is an ambient (environmental light) component, and pd is a diffuse (diffuse reflected light) component. The coefficient d of the diffuse component is expressed by the following equation by the inner product N · L of the normal vector N and the light vector L:

d = max (0, N · L)

In this way, vertex luminance information (luminance magnification) can be obtained by using the normal vector N, the light vector N, and the like.

Further, the depth cueing calculation in the depth cueing calculation unit 214 is performed as follows. In FIG. 17, CZ is depth information. Further, A is the original luminance, C is the luminance that is closer to the luminance interpolation of the depth cueing calculation, and B is obtained by the depth cueing calculation as the luminance at the position of the depth CZ. As a result, the luminance C approaches the luminance C as CZ increases, that is, the closer to the back side. The depth cueing calculation can be realized by performing the above luminance interpolation calculation on the luminance of each component of RGB. Note that the depth cueing calculation unit 214 is not necessarily included in the three-dimensional calculation unit 210, and can be included in the image forming unit 228. In this case, for example, the back color information (the color to be approximated by depth cueing calculation) may be specified, and the color interpolation calculation may be performed so as to approach the back color information as the depth information CZ increases.

Next, a specific configuration of the image forming unit 228 will be described with reference to FIG. The image forming unit 228 obtains image information of each pixel in the polygon based on the image information of each vertex of the polygon given from the three-dimensional calculation unit 210, and outputs the image information to the display 10. The drawing processing unit 229, a texture information storage unit 242, a translucent operation unit 246, and a field buffer 248.

The drawing processing unit 229 obtains the drawing color inside the polygon, and obtains the drawing color by calculating the luminance F of each component of RGB according to the following equation.

F = K × T × L

Here, K is a proportional constant, T is the luminance of the original picture, and L is the luminance magnification. For example, when the polygon is filled with one color, the luminance T is constant inside the polygon. In the case of a polygon subjected to texture mapping, the luminance of each RGB component of the original picture is stored in the texture information storage unit 242. The luminance magnification L is obtained as vertex luminance information in the vertex luminance calculation unit 219, and the luminance correction according to the above equation is performed on the polygon subjected to shading calculation and the like.

The polygon drawing data obtained by the drawing processing of the drawing processing unit 229 is sequentially written in the field buffer (VRAM or the like) 248. In the present embodiment, drawing is performed in order from the polygons on the back side, and therefore drawing data is written to the field buffer 248 in order from the polygons on the back side. Of course, in addition to this, a Z buffer method or a method of drawing sequentially from the front polygon may be adopted.

Next, the translucent calculation performed by the translucent calculation unit 246 will be described. The translucent operation unit is realized by obtaining the luminance P of each component of RGB according to the following equation.

P = K1 × B + K2 × F

Here, P is the luminance that is actually drawn, B is the luminance of the background, and F is the luminance of the translucent display object. K1 and K2 are translucency coefficients. In this embodiment, the semi-transparency coefficients K1 and K2 are adjusted according to the amount of light from the light source, and this makes it possible to express a celestial body such as the moon using semi-transparency calculation. For example, when the light amount of the light source increases and the sky color becomes brighter, K2 is decreased in the above equation (K1 may be increased). As a result, it is possible to express the moon that gradually disappears into the bright sky. On the other hand, when the light quantity of the light source decreases and the sky color becomes dark, K2 is increased in the above equation (K1 may be decreased). This makes it possible to represent the moon and the like that gradually appear in the dark sky.

Finally, the operation of this embodiment will be described with reference to the flowchart of FIG. First, it is determined whether or not a game is in progress (step S1). If the game is in progress, the game time is added to calculate the virtual time (step S2). However, when the virtual time elapses even when the player is not playing the game, the process of step S1 is not necessary. In this case, regardless of whether the game is in progress or not, for example, the virtual time continues to elapse immediately after the power is turned on.

Next, the position information of the celestial bodies such as the sun and the moon is obtained from the position information such as the virtual time and the latitude of the game stage (step S3). Thereafter, a light source vector and a light amount are obtained based on the sun position information (step S4). As described above, the light source vector can be obtained directly from the position information of the sun. The amount of light is increased, for example, when the sun is at a high position, and is decreased when the sun is at a low position.

Next, it is determined where the position of the sun is (step S5), and the process proceeds to one of steps S6, S7, and S8 according to the position. Then, when the sun is rising from the horizon to the middle of the south (in the morning), the morning haze is expressed using translucency calculation and depth cueing calculation for several hours after sunrise (step S6, FIG. 2 (B)). In other words, a semi-transparent polygon that becomes dull in the morning is displayed, and depth cueing calculation is performed so that it becomes whitish as it goes toward the back toward the screen. And as the sun rises, the effect fades away. If the sun is between the south and the horizon (afternoon), the color of the light source will turn red as sunset approaches, and the sun will change accordingly (steps) S7, FIG. 3 (B), FIG. 5 (A), (B)). When the sun is below the horizon (at night), another light source is prepared to shine light on the display object, and at the same time, depth cueing calculation is performed so that it becomes darker toward the back (step S8). , FIG. 4).

Next, as shown in step S9, the sky color is obtained from the light source color and the light quantity. As a result, the color of the sky is red in the evening, and the color of the sky is black at night. Also, the transparency of the celestial object is calculated based on the amount of light from the light source or the like, and the celestial object such as the moon is expressed by translucent calculation (FIGS. 6A and 6B). Thereafter, the process proceeds to step 10.

This embodiment is characterized in that the method of subsequent processing is changed based on where the position of the sun is, as shown in step S5. That is, if all the elements are taken into consideration and processing is uniformly performed, complicated and enormous arithmetic processing is required, and the real-time property required for the three-dimensional game device is lost. On the other hand, in this embodiment, for example, the morning haze is expressed until the sun rises in the south, the sunset is expressed until the sun sinks into the horizon, and the darkness is expressed when the sun is below the horizon. Therefore, processing is simplified. As a result, it is possible to make the player feel a sense of time passing while securing the real-time property of the three-dimensional game device.

The present invention is not limited to those described in the first and second embodiments, and various modifications can be made.

For example, in the first and second embodiments described above, the case where the virtual time elapses even when the player is not playing the game has been mainly described. You may let it pass. As for the calculation of the virtual time, for example, the elapsed time may be obtained sequentially by a program or the like at the same time when the power is turned on, or a time calculation device having a calendar function is provided and based on the actual time output from this time calculation device You may go.

Also, the virtual time can be calculated not only when the power is turned on, but also at various times such as when a program is loaded.

The shading calculation, depth cueing calculation, and translucent calculation methods are not limited to those described in the first and second embodiments, and various methods can be employed.

This embodiment can be applied not only to the fighting game described in the first and second embodiments but also to various three-dimensional game apparatuses such as a racing car game, a tank battle game, a fighter game, and a robot battle game. .

Further, the present invention can be applied not only to a commercial three-dimensional game device but also to a home game device, for example. FIG. 19 shows an example of a block diagram when the present invention is applied to a home game device. This game device includes a main device 1000, an operation unit 1012, and a storage medium (CD-ROM, game cassette, memory card, etc.) 1306, and outputs the generated images and sounds to a television monitor 1010 or the like to enjoy the game. . The main unit 1000 includes a CPU 1100 having a function of a virtual three-dimensional space calculation unit, a three-dimensional calculation unit 1210, an image synthesis unit 1220 including an image forming unit 1228, a voice synthesis unit 1300, a working RAM 1302, and a data backup unit. A backup memory (memory card or the like) 1304 is included. The elapsed time may be calculated by a game program stored in the storage medium 1306, or a time calculation device may be provided. When the storage medium 1306 is replaced and another game program is operated, it is desirable to save and store the virtual time at that time in the backup memory 1304. This is because when the game program is operated again, the game can be started from the saved virtual time.

The present invention can also be applied to a so-called multimedia terminal or a large attraction type game apparatus in which a large number of players participate.

In addition, the arithmetic processing performed in the virtual three-dimensional space arithmetic unit, the three-dimensional arithmetic unit, the image forming unit, or the like may be performed using a dedicated image processing device, or a general-purpose microcomputer, DSP, or the like is used. And may be processed in software.

In addition, the configuration of the virtual three-dimensional space calculation unit, the three-dimensional calculation unit, the image forming unit, and the calculation processing technique are not limited to those described in the present embodiment.

Furthermore, the present invention includes a configuration in which a game image obtained by image synthesis is displayed on a display called a head mounted display (HMD).

According to the present invention, it is possible to make the player feel that the time has passed, and the reality and fun of the game can be greatly increased. Further, according to the present invention, the light source is moved with the passage of virtual time, and the contents of the three-dimensional calculation are changed along with the movement. Therefore, the calculation can be simplified and speeded up compared to the case where all the elements are considered and processed uniformly, and the real-time performance of the calculation processing required for the three-dimensional game apparatus can be ensured.

Further, according to the present invention, since the game scene at the start of the next game stage changes depending on the time required for one game stage, the game stage can have various faces. As a result, the variety of game stages can be increased, and a timeless game device can be provided.

Further, according to the present invention, the player can feel the movement of the game stage, and the reality of the game can be increased.

Also, according to the present invention, when the latitude of the game stage changes, the orbit of the sun or the like that becomes the light source can be changed. This also makes it possible to express white nights in the Arctic.

Further, according to the present invention, the game screen displayed at the start of the game can be varied, the variety of game stages can be increased, and a game device with high repeatability can be provided without getting bored.

Further, according to the present invention, even on the demonstration screen, it is possible to display an image in which the scene changes such as morning, noon, evening, and night.

Further, according to the present invention, it is possible to express a red sky / sunlight at sunset, a dark sky at night, and the like.

Further, according to the present invention, it is possible to express morning and darkness at night.

Further, according to the present invention, the display object is shaded based on the light from another light source, and the atmosphere such as fighting in the darkness of the night can be expressed more realistically.

Further, according to the present invention, a celestial body appearing in a dark night sky, such as a celestial body disappearing in a bright sky, can be expressed more realistically.

It is a block diagram which shows the structure of a 1st Example. FIGS. 2A and 2B are diagrams showing an example of a game screen in the morning or morning haze scene. FIGS. 3A and 3B are diagrams showing an example of a game screen in the daytime and evening scenes. It is a figure which shows an example of the game screen of a night scene. FIGS. 5A and 5B are diagrams for explaining changes in the shape of the sun. 6A and 6B are diagrams for explaining the representation of celestial bodies by translucent computation. It is a figure for demonstrating progress of time in the case of having a some game stage. FIGS. 8A and 8B are diagrams for explaining the movement of the game stage location and the accompanying change in the sun's orbit. It is a figure for demonstrating the case where virtual time passes even when the game play is not performed. It is a block diagram which shows the structure of a 2nd Example. It is a block diagram which shows the structure of a 2nd Example. It is a block diagram which shows the structure of a 2nd Example. It is an external view at the time of applying a 2nd Example to the game device for business use. It is a figure for demonstrating display thing information. It is a figure for demonstrating a three-dimensional arithmetic process. FIGS. 16A and 16B are diagrams showing an example of the data format. It is a figure for demonstrating a depth cueing calculation. It is a flowchart for demonstrating the operation | movement of a 2nd Example. It is an example of the block diagram at the time of applying this invention to a consumer game device. 20A and 20B are examples of the game screen synthesized by the conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display 12 Operation part 100 Virtual three-dimensional space calculating part 102 Input reception part 104 Operation | movement determination part 108 State information storage part 110 Virtual three-dimensional space setting part 112 Displayed object information storage part 114 Operation pattern generation part 120 Virtual time calculation part 210 3 Dimension calculation unit 212 Image information storage unit 213 Shading calculation unit 214 Depth cueing calculation unit 215 Processing unit 218 Coordinate conversion unit 219 Vertex luminance calculation unit 220 Clipping processing unit 222 Perspective projection conversion unit 226 Sorting processing unit 228 Image forming unit 229 Drawing processing Section 242 Texture information storage section 246 Translucent operation section 248 Field buffer section

Claims (16)

A 3D game device having a plurality of game stages with different game settings, while synthesizing and displaying a view field image from an arbitrary viewpoint in a virtual 3D space,
Virtual time calculation means for calculating the elapsed time in the virtual three-dimensional space based on the elapsed time in the real space and obtaining the virtual time;
Means for calculating at least position information of a display object arranged in the virtual three-dimensional space;
Three-dimensional calculation means for performing a three-dimensional calculation including a shading calculation on a display object arranged in the virtual three-dimensional space based on the calculated virtual time;
The three-dimensional calculation means
Changing the contents of the three-dimensional calculation performed on the display object in accordance with the movement of the game stage arrangement position when the game scene shifts from one game stage to the next game stage in the plurality of game stages. A three-dimensional game device. In claim 1,
3. A three-dimensional game apparatus, wherein the contents of the three-dimensional calculation are changed by changing a position of a light source used for the three-dimensional calculation with the movement of the game stage arrangement position. A three-dimensional game device that synthesizes a view image from an arbitrary viewpoint in a virtual three-dimensional space and displays it to a player,
Virtual time calculation means for calculating the elapsed time in the virtual three-dimensional space based on the elapsed time in the real space and obtaining the virtual time;
Means for calculating at least position information of a display object arranged in the virtual three-dimensional space;
Three-dimensional calculation means for performing a three-dimensional calculation including a shading calculation for a display object arranged in the virtual three-dimensional space based on the calculated virtual time;
The virtual time calculating means is
A three-dimensional game apparatus that performs an operation for causing the virtual time to elapse even while a player is not playing a game. In claim 3,
A three-dimensional game apparatus, characterized in that when a player is not playing a game, a demonstration screen is displayed, and the display content of the demonstration screen is changed with the passage of the virtual time. In any one of Claims 1 thru | or 4,
3. A three-dimensional game apparatus, wherein at least one color of environmental light or light from a light source used in the three-dimensional calculation is changed according to the passage of the virtual time. In any one of Claims 1 thru | or 5,
A three-dimensional game characterized by including depth cueing calculation means for calculating the color of the display object to be close to a predetermined color by color interpolation, and changing the predetermined color to be approximated by color interpolation as the virtual time elapses apparatus. In any one of Claims 1 thru | or 6.
When the virtual time has passed and the light from the light source used in the three-dimensional calculation does not reach the display object, another light source different from the light source is prepared and the light source is based on the different light source. A three-dimensional game apparatus characterized by performing a three-dimensional operation. In any one of Claims 1 thru | or 7,
Including translucent computing means for rendering the translucent display object by blending the color information of the background and the color information of the translucent display object,
The translucent computing means is:
When the light amount of the light source used in the three-dimensional calculation increases as the virtual time elapses, the ratio of the color information of the translucent display object to be blended is decreased, and when the light amount decreases, the ratio is increased. A three-dimensional game device characterized in that An image composition method for composing a view image from an arbitrary viewpoint in a virtual three-dimensional space and displaying it to a player, and displaying a plurality of game stages with different game settings,
A virtual time calculating step of calculating an elapsed time in the virtual three-dimensional space based on an elapsed time in the real space and obtaining a virtual time;
Calculating at least position information of a display object arranged in the virtual three-dimensional space;
A three-dimensional calculation step for performing a three-dimensional calculation including a shading calculation on a display object arranged in the virtual three-dimensional space based on the calculated virtual time,
In the three-dimensional calculation step,
Changing the contents of the three-dimensional calculation performed on the display object in accordance with the movement of the game stage arrangement position when the game scene moves from one game stage to the next game stage in the plurality of game stages. An image composition method characterized by the above. In claim 9,
A method of synthesizing an image, wherein the content of the three-dimensional calculation is changed by changing a position of a light source used for the three-dimensional calculation with the movement of the game stage arrangement position. An image synthesis method for synthesizing a view image from an arbitrary viewpoint in a virtual three-dimensional space and displaying it on a player,
A virtual time calculating step of calculating an elapsed time in the virtual three-dimensional space based on an elapsed time in the real space and obtaining a virtual time;
Calculating at least position information of a display object arranged in the virtual three-dimensional space;
A three-dimensional calculation step of performing a three-dimensional calculation including a shading calculation for a display object arranged in the virtual three-dimensional space based on the calculated virtual time,
In the virtual time calculating step,
An image synthesizing method, wherein a calculation is performed to elapse the virtual time even when a player is not playing a game. In claim 11,
An image composition method, comprising: displaying a demo screen when a player is not playing a game, and changing display contents of the demo screen as the virtual time elapses. In any of claims 9 to 12,
An image synthesizing method, wherein at least one color of ambient light or light from a light source used in the three-dimensional calculation is changed according to the passage of the virtual time. In any of claims 9 to 13,
An image synthesis method comprising a depth cueing calculation step for calculating the color of the display object close to a predetermined color by color interpolation, and changing the predetermined color to be approximated by color interpolation according to the passage of the virtual time . In any of claims 9 to 14,
When the virtual time has passed and the light from the light source used in the three-dimensional calculation does not reach the display object, another light source different from the light source is prepared and the light source is based on the different light source. An image composition method characterized by performing a three-dimensional operation. In any of claims 9 to 15,
A translucent operation step for rendering the translucent display object by blending the color information of the background and the color information of the translucent display object,
In the translucent operation step,
When the light amount of the light source used in the three-dimensional calculation increases as the virtual time elapses, the ratio of the color information of the translucent display object to be blended is decreased, and when the light amount decreases, the ratio is increased. An image composition method characterized in that

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