JP2023048792A - Information processing apparatus, program, and drawing method - Google Patents

Abstract

To provide an information processing apparatus configured to draw natural overlapping of multiple semi-transparent objects which has been difficult to represent.SOLUTION: An information processing apparatus 2 includes: a viewpoint acquisition unit 12 which acquires a viewpoint in a three-dimensional virtual space; an object information acquisition unit 13 which acquires object information indicating that multiple objects arranged in the three-dimensional virtual space are an opaque object or a semi-transparent object, respectively; a screen drawing unit 14 which draws a screen including one object and the other object of the multiple objects, when a determination is made from the object information that the one or the other object is a semi-transparent object, in accordance with a distance from the viewpoint to the other object, with density of the one object and density of the other object determined from a relationship between the distance and the density of the one object; and a screen output unit 15 which outputs the screen on a display device 4.SELECTED DRAWING: Figure 4

Description

The present invention relates to an information processing apparatus, program, and drawing method.

There are various types of objects drawn on the screen, and there are, for example, translucent objects and opaque objects. Traditional image processing uses alpha values to specify transparency. The alpha value takes a value in the range of "0" to "255", for example. An object with an alpha value of "0" is completely transparent, and an object with an alpha value of "255" is completely opaque. A non-opaque object with an alpha value of less than "255" is called a translucent object to distinguish it from an opaque object with an alpha value of "255".

Conventionally, an opaque object has been drawn by an information processing apparatus in the following procedure.
First, the depth information of the opaque object to be drawn is compared with the depth information of the opaque object that has already been drawn. Since the depth information of the opaque object that has already been drawn is stored in the Z-buffer, the depth information read from the Z-buffer is compared with the depth information of the opaque object to be drawn.

Next, if the opaque object to be drawn is present in front of the opaque object that has already been drawn, the depth information in the Z buffer is updated after the opaque object is newly drawn. On the other hand, if the opaque object to be drawn is behind the already drawn opaque object, the opaque object behind is not drawn.
The information processing device draws the screen by repeating the above procedure for all objects visible from the viewpoint.

Here, when a semi-transparent object exists in a position where a certain object overlaps in front of a certain object when viewed from the viewpoint in the three-dimensional virtual space, not only the semi-transparent object on the near side, but also the translucent object on the far side that can be seen through the semi-transparent object. Objects also need to be drawn. For this reason, it is not possible to use the technique of not drawing objects on the far side, as shown in the above-described conventional opaque object drawing procedure.

Therefore, conventionally, the following methods for drawing translucent objects have been known.
(First drawing method)
The semi-transparent objects to be drawn from now on are limited, and after other objects are drawn, the semi-transparent object is drawn last.
(Second drawing method)
Draws a semi-transparent object punched out in a grid pattern on top of another object.

Further, Japanese Patent Application Laid-Open No. 2002-200000 discloses a technique for adjusting the degree of blurring of a semi-transparent object and an opaque object according to the transparency of the semi-transparent object.

Japanese Patent No. 5857608

The above-described conventional first and second drawing methods for drawing a translucent object have the following problems.
In the first drawing method, if the other object is an opaque object, even if the translucent object is drawn after the opaque object is drawn, no sense of incongruity is caused. However, if other objects are semi-transparent objects, it is difficult to determine which semi-transparent object to draw last.
In the second drawing method, the semi-transparent object is punched in a grid pattern, so the drawn object is a modified version of the semi-transparent object. For this reason, the semi-transparent object intended by creators such as designers cannot be drawn.

Also, with the technique disclosed in Patent Document 1, although it is possible to draw overlapping semi-transparent objects and opaque objects, there is a tendency for rendering scenes in which semi-transparent objects overlap opaque objects to be unnatural. there were.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object of the present invention is to enable the overlapping of a plurality of translucent objects to be depicted naturally.

An information processing apparatus according to the present invention includes a viewpoint acquisition unit that acquires a viewpoint in a three-dimensional virtual space, and indicates whether each of a plurality of objects placed in the three-dimensional virtual space is an opaque object or a translucent object. an object information acquisition unit that acquires object information; a screen drawing unit for drawing a screen containing the one object and the other object based on the density of the one object and the density of the other object obtained from the relationship between the distance and the density of the one object; and a screen output unit that outputs the

According to the present invention, it is possible to naturally render overlapping of a plurality of translucent objects.
Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is an overall configuration diagram showing an overview of an image drawing system according to a first embodiment of the present invention; FIG. 1 is a block diagram showing a hardware configuration example of an information processing apparatus according to a first embodiment of the present invention; FIG. FIG. 3 is a diagram showing an example of a top view and a screen showing an example of arrangement of objects in a three-dimensional virtual space according to the first embodiment of the present invention; FIG. 1 is a functional block diagram showing a functional configuration example of an information processing apparatus according to a first embodiment of the present invention; FIG. FIG. 5 is a diagram showing an example of an approximation curve that approximates the distance-density curve according to the first embodiment of the present invention; 4 is a flow chart showing an example of overall processing of the information processing apparatus according to the first embodiment of the present invention; 6 is a flowchart showing an example of detailed processing of object information acquisition processing according to the first embodiment of the present invention; 4 is a flowchart showing an example of detailed processing of screen drawing processing according to the first embodiment of the present invention; 5 is a flowchart showing an example of detailed processing of density determination processing according to the first embodiment of the present invention; FIG. 7 is a block diagram showing a configuration example of an information processing device according to a second embodiment of the present invention; It is a figure which shows the structural example of LUT which concerns on the 2nd Embodiment of this invention. FIG. 11 is a flowchart showing an example of detailed processing of screen drawing processing according to the second embodiment of the present invention; FIG. FIG. 11 is a flowchart showing an example of detailed processing of screen drawing processing according to the second embodiment of the present invention; FIG. It is a figure which shows the structural example of LUT based on the 1st modification of the 2nd Embodiment of this invention. It is a figure which shows the structural example of LUT based on the 2nd modification of the 2nd Embodiment of this invention. It is a figure which shows the structural example of LUT based on the 3rd modification of the 2nd Embodiment of this invention. FIG. 11 is a block diagram showing a hardware configuration example of a content distribution system according to a third embodiment of the present invention; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings. In the present specification and drawings, constituent elements having substantially the same function or configuration are denoted by the same reference numerals, thereby omitting redundant description.

[First embodiment]
<Overall Configuration Example of Image Drawing System>
FIG. 1 is an overall configuration diagram showing an outline of an image drawing system 1 according to the first embodiment.
The image drawing system 1 includes an information processing device 2 , an operation controller 3 and a display device 4 . An operation controller 3 and a display device 4 are connected to the information processing device 2 wirelessly or by wire. As the information processing device 2, for example, a dedicated game terminal, a PC (Personal Computer), or the like is used. The operation controller 3 is used as an example of an input device for inputting input information of an operation performed by a user using the information processing device 2 to the information processing device 2 .

In the image drawing system 1, the information processing device 2 reads out and executes a program recorded on a recording medium such as an optical disk, and the information processing device 2 draws a screen according to input information from the operation controller 3. A process for displaying the screen by the device 4 is performed. In this specification, text, still images, moving images, music, voice, and information combining them are referred to as content. The content is expressed by the information processing device 2 executing a program read from the recording medium. Also, content-specific behavior is controlled by the program of the content itself. Therefore, in the following description, the terms "program" and "content" may be used interchangeably.

In this embodiment, it is assumed that the program processed by the information processing device 2 is a computer game. The information processing device 2 reads a program from an external recording medium such as an optical disc loaded in an optical drive 29 shown in FIG. Note that the information processing apparatus 2 can record a program in its own internal recording medium, read the program from the internal recording medium, and perform a predetermined process.

The information processing device 2 selects a program based on an operation signal input from the operation controller 3 and outputs a video signal adapted to the screen of the display device 4 to the display device 4 . When the program operated by the operation controller 3 is a computer game, the information processing device 2 draws a screen according to the input information from the operation controller 3, and displays the image of the screen on the display device 4. Output a signal.
The display device 4 displays video based on the video signal input from the information processing device 2 .

For example, in a computer game loaded by the information processing device 2, the user of the information processing device 2 operates a specific character (referred to as a “player”) displayed on the display device 4 through the operation controller 3, thereby allowing the player to A screen on which various scenes including are drawn is displayed on the display device 4 . A player is an object that can move freely in a three-dimensional virtual space. The operations to the player from the operation controller 3 include, for example, movement of the player up, down, left, right, and oblique directions, movement of the viewpoint for overlooking the scene including the player, input of various commands, and the like. The player and the scene displayed on the display device 4 change almost in real time by the operation performed by the operation controller 3 . Therefore, the display device 4 displays a scene including the player corresponding to the position, command, etc. intended by the user.

<Hardware Configuration Example of Information Processing Device and Content Distribution Server>
Next, a hardware configuration example of the information processing device 2 that configures the image drawing system 1 will be described.
FIG. 2 is a block diagram showing a hardware configuration example of the information processing device 2. As shown in FIG.

(Configuration example of information processing device)
The information processing device 2 is an example of a computer that operates as a computer capable of executing various programs. The information processing device 2 includes a CPU (Central Processing Unit) 21, a GPU (Graphics Processing Unit) 22, a ROM (Read Only Memory) 23, a RAM (Random Access Memory) 24, a network interface 26, and a It has an input/output interface 27 , a non-volatile storage 28 and an optical drive 29 .

The CPU 21 reads the program code of the software that implements each function according to the present embodiment from the ROM 23, loads it into the RAM 24, and executes it. Variables, parameters, etc. generated during the arithmetic processing of the CPU 21 or GPU 22 are temporarily written in the RAM 24, and these variables, parameters, etc. are read by the CPU 21 or GPU 22 as appropriate. The CPU 21 performs processing such as the processing of the OS (Operating System) of the information processing device 2 and the management of input/output of data performed in each section in the information processing device 2 .

The GPU 22, for example, performs processing necessary to draw a three-dimensional object on the screen. In the following description, rendering processing refers to processing performed by the GPU 22 according to instructions from the CPU 21 . As shown in FIG. 2, the GPU 22 and the CPU 21 may be configured separately, or the GPU 22 may be incorporated inside the CPU 21 .

For the network interface 26, for example, a NIC (Network Interface Card) or the like is used, and various data can be obtained via a LAN (Local Area Network), a dedicated line, or the like connected to the terminal of the NIC, or other information can be obtained. It is possible to communicate with the processing device 2 .

The input/output interface 27 converts the operation signal received from the operation controller 3 into data in a predetermined format, and transfers the data to the CPU 21 . The input/output interface 27 also converts screen data drawn by the GPU 22 into a video signal and outputs the video signal to the display device 4 . The display device 4 displays an image based on the image signal received from the input/output interface 27 on the screen. The input/output interface 27 can also output audio signals to the display device 4 . Based on the audio signal received from the input/output interface 27 , the display device 4 can emit sound from a speaker (not shown) configured in the display device 4 .

As the non-volatile storage 28, for example, HDD (Hard Disk Drive), SSD (Solid State Drive), flexible disk, optical disk, magneto-optical disk, CD-ROM, CD-R, or non-volatile memory is used. The nonvolatile storage 28 stores programs for operating the information processing device 2 in addition to the OS and various parameters. The ROM 23 and the non-volatile storage 28 record programs and data necessary for the operation of the CPU 21, and are computer-readable non-transitory storage media storing programs executed by the information processing device 2. Used as an example.

If the non-volatile storage 28 is an external recording medium such as an optical disk, the optical drive 29 reads this non-volatile storage 28 and extracts data. The data retrieved by the optical drive 29 is used for predetermined arithmetic processing by the CPU 21 or GPU 22 .

<Example of 3D virtual space>
Next, an example of a three-dimensional virtual space according to the first embodiment will be explained.
FIG. 3 is a diagram showing an example of a top view and a screen 32 showing an arrangement example of objects in a three-dimensional virtual space.
The upper side of FIG. 3 shows a top view of the three-dimensional virtual space.

A large number of objects are arranged in the three-dimensional virtual space. Here, an example in which a cylinder object 51 used as an opaque object, cloud objects 50, 52, 53 used as translucent objects, and a flame object 54 used as a translucent object are arranged in a three-dimensional virtual space will be described. In the drawing, a distance L1 from the viewpoint to the cylindrical object 51, a distance L2 from the viewpoint to the cloud object 53, and a distance L3 from the viewpoint to the flame object 54 are shown. Here, the distance L1 represents the length of the line segment from the virtual camera 30 to the cylindrical object 51 along the arrow 41. FIG. Similarly, distance L2 represents the length of the line segment from virtual camera 30 to cloud object 53 along arrow 42, and distance L3 represents the length of the line segment from virtual camera 30 to flame object 54 along arrow 43. represents length.

A virtual camera 30 is arranged in the three-dimensional virtual space. The virtual camera 30 is a virtual representation of a camera placed in a three-dimensional virtual space, and for example, photographs the inside of the three-dimensional virtual space according to the orientation of the player. The virtual camera 30 is arranged at a point of view at an arbitrary position in the three-dimensional virtual space, and is capable of capturing an image that matches the orientation of the player, an image that looks down on the player, and the like. Therefore, the position of the virtual camera 30 is called a "viewpoint". A screen drawing unit 14 shown in FIG. 4, which will be described later, draws an image according to the movement of the viewpoint.

The virtual camera 30 can photograph an object within an angle of view 31 . The object photographed by the virtual camera 30 is drawn on the screen 32 indicated by the dashed line in the figure. It is assumed that the drawing area of screen 32 substantially matches the display area of display device 4 . In FIG. 3, the size and number of pixels of the screen displayed on the display device 4 and the screen 32 drawn by the screen drawing unit 14 are the same. However, the size and number of pixels of the screen displayed on the display device 4 and the screen 32 drawn by the screen drawing unit 14 may be different.

Next, assuming three arrows 41 to 43 in the angle of view 31 with the viewpoint of the virtual camera 30 as a reference, an example of the screen 32 displayed on the display device 4 when a plurality of objects are arranged in the direction of the arrows is shown. explain.
An example of screen 32 is shown at the bottom of FIG. The screen 32 is a view of the three-dimensional virtual space shown on the upper side of FIG. This screen 32 is composed of a plurality of pixels P. As shown in FIG.

(1) Arrangement of Translucent Objects, Opaque Objects, and Translucent Objects A cloud object 50 (semi-transparent object), a cylinder object 51 (opaque object), and a cloud object 52 (semi-transparent object) are arranged in the direction of the arrow 41 from the viewpoint. I'm in. Since the cylinder object 51 is opaque, the part of the cloud object 52 behind the cylinder object 51 that overlaps with the cylinder object 51 is not drawn. On the other hand, the cloud object 50 on the front side of the cylinder object 51 is translucent. Therefore, in the pixel P1, a part of the cylinder object 51 is drawn through the cloud object 50 .

(2) Semi-Transparent Object--Arrangement of Semi-Transparent Objects A cloud object 50 (semi-transparent object) and a cloud object 53 (semi-transparent object) are lined up in the direction of the arrow 42 from the viewpoint. Cloud object 50 is translucent. Therefore, in the pixel P2, part of the cloud object 53 is rendered transparently from the cloud object 50 . A portion of the cloud object 53 that does not overlap the cloud object 50 is drawn with a different density than a portion that overlaps the cloud object 50 . For example, a portion where the cloud object 50 and the cloud object 53 overlap is drawn with the respective cloud objects 50 and 53 transparent, so that each pixel is drawn with a high density as shown in the lower part of FIG. On the other hand, in the portions where the cloud objects 50 and 53 do not overlap, only the respective cloud objects 50 and 53 are drawn, so the density of each pixel is drawn thinner than in the portions where the cloud objects 50 and 53 overlap. However, since the densities of the individual cloud objects 50 and 53 are determined by a technique such as composition synthesis, it cannot be determined whether the density of each pixel of the cloud objects 50 and 53 will increase or decrease. For this reason, the density of the non-overlapping portions of the individual cloud objects 50 and 53 is not always rendered lighter than the density of the overlapping portions.

(3) Arrangement of Translucent Objects Inside Translucent Objects A cloud object 50 (semi-transparent object) and a flame object 54 (semi-transparent object) are lined up in the direction of the arrow 43 from the viewpoint. However, the cloud object 50 contains the flame object 54 inside. Cloud object 50 is translucent. Therefore, the flame object 54 is rendered transparently through the cloud object 53 at the pixel P3.

<Functional Configuration Example of Information Processing Apparatus According to First Embodiment>
Next, a functional configuration example of the information processing device 2 according to the first embodiment will be described.
FIG. 4 is a functional block diagram showing a functional configuration example of the information processing device 2. As shown in FIG.

The information processing device 2 includes an input reception unit 11 , a viewpoint acquisition unit 12 , an object information acquisition unit 13 , a screen drawing unit 14 and a screen output unit 15 .

The input reception unit 11 receives input information from the operation controller 3 . The function of the input reception unit 11 is realized mainly by the input/output interface 27 shown in FIG. The input reception unit 11 also receives, as input information, start information such as interrupt processing that occurs in a certain scene. In this case, even if there is no input information from the operation controller 3, the scene may change or the viewpoint may move. Therefore, it is also realized by internal processing of the CPU 21 .

The viewpoint acquisition unit 12 acquires a viewpoint according to the position of the player object in the three-dimensional virtual space. It is assumed that the viewpoint acquired by the viewpoint acquisition unit 12 as described above substantially coincides with the position of the virtual camera 30 shown in FIG.

The object information acquisition unit 13 acquires object information indicating whether each of the plurality of objects placed in the three-dimensional virtual space is an opaque object or a translucent object. The object information includes, for example, attribute information of the object itself such as whether the object is a cloud object, a cylinder object, or a flame object.

In addition, the object information includes luminance information of the object determined by the object information acquisition unit 13 . The brightness of the object can be calculated by the object information acquisition unit 13 . For example, the object information acquisition unit 13 determines the brightness of an object placed in a three-dimensional virtual space and drawn on the screen with reference to the viewpoint by calculating at least the path of virtual light incident on the viewpoint. Here, the object information acquisition unit 13 can execute ray march processing or ray tracing processing to determine the brightness of the object.

When the screen drawing unit 14 determines from the object information that the one object and the other objects among the plurality of objects are translucent objects, the screen drawing unit 14 obtains the densities of the one object and the other objects. One object is assumed to be, for example, the cloud object 50 shown in FIG. Other objects are assumed to be, for example, the cloud objects 52 and 53 and the flame object 54 shown in FIG.

Then, the screen drawing unit 14 calculates the density and density of one object from the relationship between the distance and density of the one object according to the distance from the viewpoint to the other objects (for example, the distances L1 to L3 shown in FIG. 3). Find the density of other objects. The relationship between distance and density is represented by an approximation curve 65 shown in FIG. 5, which will be described later. Then, the screen drawing unit 14 draws the screen 32 including the one object and the other objects whose densities are obtained.
The screen output unit 15 outputs the screen drawn by the screen drawing unit 14 to the display device 4 .

The functions of the input reception unit 11 and the screen output unit 15 are realized by the input/output interface 27 shown in FIG. The functions of the viewpoint acquisition unit 12, the object information acquisition unit 13, and the screen drawing unit 14 are realized by the GPU 22 shown in FIG. may be implemented.

<Details of the process of the screen drawing part>
When the screen drawing unit 14 shown in FIG. 4 determines from the object information that the above-described one object and the other object are translucent objects, the change point at which the density changes according to the distance from the viewpoint is By determining the relationship between the set distance and the density, the density of one object and the density of the other object are obtained. Therefore, a method of creating an approximation curve representing the relationship between distance and density and a method of determining the density of a translucent object will be described.

FIG. 5 is a diagram showing an example of an approximation curve that approximates the distance-density curve. The horizontal axis of the graph in FIG. 5 represents distance, and the vertical axis represents concentration [%].
FIG. 5A shows an example of a distance-density curve 60 and an approximation curve 65 represented by a pixel P having three elements of RGB. FIG. 5B shows an example of a distance-density curve 70 and an approximation curve 75 represented by a pixel P having four elements of RGBA. In the following description, both the distance-density curves 60 and 70 are also called "true density curves".

First, the approximation curve 65 shown in FIG. 5A will be described.
A distance-density curve 60 represented by a thin line in FIG. 5A is approximated by an approximation curve 65 representing the relationship between distance and density represented by a thick line in FIG. 5A. Then, the relationship between distance and density is saved for each pixel of one object. Also, the change points forming the approximation curve 65 are set according to the number of pixel elements. The distance described with reference to FIG. 5 is a value represented by a decimal number with the farthest point recognizable by the information processing device 2 as a reference (1.0). This distance is a dimensionless value because it is represented by a decimal number obtained by dividing the point distance (for example, the distance from the virtual camera 30 to the cloud object)/the farthest distance. However, a modified example in which the distance described in FIG. 5 is a value in meters may be used.

In general, pixels store RGB pixel values. The pixel value takes a value in the range of "0" to "255" for each element of RGB.
On the other hand, in this embodiment, three change points 61 to 63 are stored for each element of a pixel capable of storing RGB pixel values. For example, the R element stores "0.25" corresponding to the change point 61 when the density is 0%. Similarly, the G element stores "0.4" corresponding to the change point 62 when the density is 50%, and the B element stores "0.4" corresponding to the change point 63 when the density is 100%. "0.8" is stored.

The distance stored in each element of RGB is a floating-point value. In this embodiment, floating point numbers are represented by the float type. Float type data has a size of 4 bytes (32 bits). The float-type data consists of a sign part (1 bit), an exponent part (8 bits), and a mantissa part (23 bits). Therefore, each element of RGB can store 32-bit data. By expressing the distance in a float-type floating point, it becomes possible to finely set the value of the distance, and the accuracy of the distance is improved. For example, it is possible to express the distance from the virtual camera 30 to the cloud object as 3 km. If the distance is not represented by floating point, the number of digits that can represent the distance is reduced. Therefore, for example, even if the distance of the cloud object is expressed as 3 km ahead, the error with respect to the actual value increases and the accuracy of the distance decreases.

Here, the relationship between the density of one object and the density of other objects will be described.
First, for one object (for example, a cloud object), the relationship between distance and density is determined in advance. That is, a true density curve for one object is determined. Therefore, the screen drawing unit 14 refers to the true density curve of the one object to determine the density of the one object for the pixel P which is a single object and does not overlap another object.

On the other hand, in determining the density of a pixel P where one object overlaps another object, the screen drawing unit 14 refers to the true density curve of the one object only for the one object alone and for the other object. This is the same as the density determination process described above when there is no overlap with the object of . However, since the screen drawing unit 14 needs to consider the overlapping of one object and another object, the density of one object cannot be determined immediately. Therefore, the screen drawing unit 14 saves the change points 61 to 63 shown in FIG. 5A in respective elements of RGB. After that, the screen drawing unit 14 determines the densities of one object and another object by determining an approximate curve 65 from the change points 61 to 63 in the process of drawing another object. In this way, the approximate curve 65 is used as an example of the relationship between the distance and the density at which the change point at which the density changes according to the distance from the viewpoint is set.

For example, it is assumed that the screen drawing unit 14 determines the approximate curve 65 shown in FIG. 5A based on the pixels P of the cloud object 50 existing on the viewpoint side shown in FIG. Then, it is assumed that the cloud object 53 existing behind the cloud object 50 shown in FIG. 3 is shown in FIG. 5A at the position of the distance L2. As shown in FIG. 3, the density of the cloud object 53 on the far side changes depending on the thickness, density, etc. in the depth direction of the cloud object 50 on the viewpoint side. Also, since a Z buffer is provided for each pixel, the screen drawing unit 14 can know the overlapping order of a plurality of objects. Therefore, when the screen drawing unit 14 determines that the cloud objects 50 and 53 are arranged in an overlapping manner at a certain pixel P with the viewpoint as a reference, the screen drawing unit 14 creates an approximate curve 65 at the pixel P. FIG.

Here, an object 55 at a distance where the density of the cloud object 50 is 0[%] is rendered with the original density of this object 55, regardless of whether it is an opaque object or a translucent object. On the other hand, an object 56 at a distance where the density of the cloud object 50 is 100[%] is not rendered or is rendered transparent, regardless of whether it is an opaque object or a translucent object.

If the density of the cloud object 50 is within the range of 0[%] to 100[%], the density of the cloud object 53 overlapping the cloud object 50 is affected. Therefore, after determining the approximate curve 65 using the change points 61 to 63 stored in the elements of the pixel P, the screen drawing unit 14 calculates the distance L2 from the cloud object 50 to the cloud object 53 on the far side of the approximate curve. Apply to 65. Then, the screen drawing unit 14 obtains the density x [%] of the cloud object 50 from the approximate curve 65 at the distance L2. The fact that the density x [%] is a value lower than the density 100 [%] means that the cloud object 53 on the far side is drawn through the cloud object 50 . Therefore, when the original density of the cloud object 53 on the back side is 100[%], the screen drawing unit 14 calculates the density of the cloud object 53 as 100[%]-x[%]. Draw the cloud object 53 by [%]-x[%].

Here, the formula for obtaining the density of the other semi-transparent object existing on the back side with respect to the density of one semi-transparent object existing on the viewpoint side is the above additive synthesis formula (100% of the original density ]-x [%]). Various methods such as multiplication synthesis may be used for the densities of other translucent objects.

Note that the above discussion describes how a plurality of translucent objects are drawn when they overlap at a certain pixel P. FIG. Even if the cloud object 53 is placed at a distance L2 from the viewpoint, the density of the cloud object 50 does not affect the portion where the cloud object 53 does not overlap the cloud object 50 . Therefore, a portion that does not overlap with the cloud object 50 is drawn with the original density of the cloud object 53 .

Also, the true density curve differs for each pixel. For this reason, the density of other translucent objects (such as the cloud object 53) overlapping the cloud object 50 differs for each pixel depending on the thickness of the cloud object 50 in the depth direction. There is For example, when a cloud object 50 that is thick in the depth direction exists on the viewpoint side, the density of other translucent objects is light. Conversely, when the cloud object 50 thin in the depth direction is on the viewpoint side, the density of the other translucent objects is high.

Next, the approximation curve 75 shown in FIG. 5B will be described.
In FIG. 5B, the distance-density curve 70 represented by the thin line is approximated by an approximation curve 75 representing the relationship between distance and density represented by the thick line in FIG. 5B. Note that the distance-density curve 70 shown in FIG. 5B is slightly different from the distance-density curve 60 shown in FIG. 5A.

In the form shown in FIG. 5B, four change points 71 to 74 are stored for each pixel element capable of storing RGBA pixel values. For example, the R element stores "0.25" corresponding to the change point 71 when the density is 0%, and the G element stores "0.25" corresponding to the change point 72 when the density is 33%. "0.44" is stored. Similarly, the B element stores "0.55" corresponding to the change point 73 when the density is 66%, and the A element stores "0.55" corresponding to the change point 74 when the density is 100%. "0.8" is stored.

The approximation curve 75 shown in FIG. 5B has a large number of changing points, so it approximates the distance-density curve 70 better than the approximation curve 65 shown in FIG. 5A. However, since the change points 71 to 74 are stored in the RGBA elements, the data size for each pixel increases.

Although FIG. 5 shows an example in which the distance stored in each element of RGB or RGBA is expressed in float type floating point, the distance stored in each element of RGB or RGBA is expressed in double type floating point. It is also possible to express Double type data has a size of 4 bytes (32 bits). The double type data consists of a sign part (1 bit), an exponent part (11 bits), and a mantissa part (52 bits). Therefore, the double type floating point has twice the precision of the float type floating point, and can represent a longer distance than the float type.

When the screen drawing unit 14 uses the approximate curve 75 shown in FIG. 5B to draw a plurality of semi-transparent objects when they overlap at a certain pixel, the approximate curve 65 shown in FIG. The process is the same as when drawing a .

Also, in FIG. 5A, the distances when the density is equally divided into 0%, 50%, and 100% are used as the distances stored in each element of RGB. However, as the distance stored in each element of RGB, the distance obtained by dividing the density into unequal divisions such as 10%, 50%, and 90% for each of the RGB elements of the pixel may be used. Similarly, for the distance stored in each element of RGBA, the distance obtained by dividing the density unevenly for the RGBA element of the pixel may be used.

The approximate curve may be represented by a broken line as shown in FIG. 5, or may be represented by a more accurate curve function using a predetermined curve regression method (for example, curve fitting).

Also, a true density curve may be used as an example of the relationship between distance and density. In this case, the screen drawing unit 14 can obtain the density of one object and the density of other objects based on the true density curve.

<Flow of Processing in Information Processing Apparatus>
Based on the above consideration, the processing related to the drawing method of the screen 32 performed by the information processing apparatus 2 according to the present embodiment will be described with reference to the flowcharts shown in FIGS. 6 to 9 below. In the following description, it is assumed that processing is performed using an approximate curve 65 represented by pixels P having three elements of RGB shown in FIG. 5A.
FIG. 6 is a flowchart showing an example of the processing of the information processing apparatus 2 as a whole.

First, the input reception unit 11 receives input information from the operation controller 3 (S1). As described above, the input information includes not only information input from the operation controller 3, but also, for example, information indicating that the current scene is to be switched to another scene. includes information indicating that the Next, the viewpoint acquisition unit 12 acquires a viewpoint in the three-dimensional virtual space (S2).

Next, the object information acquisition unit 13 acquires object information of all objects placed within the angle of view of the virtual camera 30 shown in FIG. 3 (S3). Object information includes, for example, information such as the distance from the viewpoint to the object. Also, the object information acquisition unit 13 calculates and acquires the brightness of the object.

Next, the screen drawing unit 14 draws the screen (S4). At this time, when a plurality of translucent objects are arranged side by side, the screen drawing unit 14 calculates the densities of the plurality of translucent objects for each pixel using the approximate curve 65 shown in FIG. 5A.

Finally, the screen output unit 15 outputs the screen drawn by the screen drawing unit 14 to the display device 4 (S5). Here, the screen output unit 15 outputs a screen by transmitting a video signal that the display device 4 can accept to the display device 4 . The display device 4 displays a screen when receiving the video signal.

The resolution of the screen 32 drawn by the screen drawing unit 14 and the resolution of the screen displayable by the display device 4 may be the same or different. For example, even if the screen drawing unit 14 draws and outputs a 2K size screen, the screen output unit 15 up-converts the screen to a 4K size, so that the display device 4 capable of displaying 4K video becomes 4K. It is also possible to display a screen of size.

Next, a detailed example of the object information acquisition process shown in step S3 of FIG. 6 will be described.
FIG. 7 is a flowchart illustrating an example of detailed processing of object information acquisition processing.

First, the object information acquisition unit 13 acquires attribute information of each object placed in the three-dimensional virtual space (S11). The object attribute information includes various information for defining the object. For example, an object is set with attribute information indicating whether it is an opaque object or a translucent object. Therefore, the object information acquisition unit 13 determines whether the object is an opaque object or a translucent object based on the attribute information of the object of interest.

The object information acquisition unit 13 can also determine whether this object is a rock object, a person object, or a cloud object, based on the attribute information of the object of interest. In addition, the object information acquisition unit 13 acquires the distance from the viewpoint to the object for each pixel P, so that the arrangement of the objects, the overlapping of the objects, and the like can be grasped.

Next, the object information acquisition unit 13 performs ray march processing on the object within the angle of view, and calculates the luminance for each pixel P on the screen 32 shown in FIG. 3 (S12).

Next, the object information acquisition unit 13 acquires the distance from the viewpoint to the object for each pixel (S13). As shown in FIG. 3 , the object information acquisition unit 13 acquires the distance from the viewpoint to each object for each pixel P on the screen 32 .
After that, the object information acquisition unit 13 returns the process to the drawing process (S4) shown in FIG.

Next, a detailed example of the screen rendering process shown in step S4 of FIG. 6 will be described.
FIG. 8 is a flowchart illustrating an example of detailed screen drawing processing.

First, the screen drawing unit 14 determines whether or not all the pixels P in one screen 32 shown in FIG. 3 have been processed (S21). If all the pixels P in the screen 32 have not been processed (NO in S21), the screen drawing unit 14 focuses on the unprocessed pixels P and determines whether or not there is a pixel P where multiple objects overlap. (S22).

If there is no pixel P where multiple objects overlap (NO in S22), the screen drawing unit 14 returns to step S21 and continues processing.
On the other hand, if there is a pixel P where multiple objects overlap (YES in S22), the screen drawing unit 14 determines whether or not the multiple overlapping objects are translucent objects (S23). For example, pixels P2 and P3 shown in FIG. 3 represent a plurality of overlapping objects that are translucent objects.

If the overlapping objects are not translucent objects (NO in S23), the screen drawing unit 14 returns to step S21 and continues processing.
On the other hand, if any of the plurality of overlapping objects is a translucent object (YES in S23), the screen drawing unit 14 performs a process of determining the density of each object for each pixel (S24). After that, the screen drawing unit 14 returns to step S21 and continues the processing.

Then, if all the pixels P in the screen 32 have been processed (YES in S21), the screen drawing unit 14 draws the screen according to the position of the player based on the density of the object determined in step S24 ( S25).
After that, the screen drawing unit 14 returns the process to the screen output process (S5) shown in FIG.

Next, a detailed example of the density determination process shown in step S24 of FIG. 8 will be described.
FIG. 9 is a flowchart illustrating an example of detailed processing of density determination processing.

First, the screen drawing unit 14 acquires the change points 61 to 63 shown in FIG. 5 for each of the RGB elements stored in the pixel P (S31). Next, the screen drawing unit 14 determines an approximate curve 65 using the acquired change points 61 to 63 (S32).

Then, the screen drawing unit 14 applies the distance from the viewpoint to the object to the approximation curve 65 to determine the density of the object at that pixel P (S33). In this way, the screen drawing unit 14 records the distance of the translucent object from the viewpoint, instead of recording the transparency of the alpha value as in the conventional art, and uses these distances and the approximation curve 65 to Determines the density of translucent objects. The determined density of the object is stored for each pixel P in the RAM 24 shown in FIG. 2, for example.
After that, the screen drawing unit 14 returns the process to step S21 of the screen drawing process shown in FIG.

In the image drawing system 1 according to the first embodiment described above, even if a plurality of semi-transparent objects overlap each other, each semi-transparent object is drawn so that the respective densities are natural. Among a plurality of semi-transparent objects that overlap at a certain pixel P, the influence of the density of the semi-transparent object placed on the viewpoint side is determined by the distance to the semi-transparent object placed on the back side. Therefore, not only scenes in which a plurality of semi-transparent objects are arranged side by side from the viewpoint side to the back side, but also scenes in which a semi-transparent object is arranged so as to include another semi-transparent object inside another, The density of each translucent object is rendered naturally.

Here, the screen drawing unit 14 uses the change points 61 to 63 obtained from the pixel P for each RGB element to create an approximate curve 65 that approximates the distance-density curve 60 shown in FIG. This approximation curve 65 can be created only by interpolating between change points 61-63. Therefore, the screen drawing unit 14 can reduce the load of creating the approximate curve 65 .

In addition, since the density of the translucent object is determined for each pixel P, complicated density changes are rendered. As a result, objects with a three-dimensional effect can be represented as compared with conventional objects drawn in a wide range with a constant density. For example, it is possible to create three-dimensional expressions such as characters moving in clouds or fog, flames burning in fog, and cloud objects whose shape and density change with the passage of time. In this way, a translucent object, which has conventionally been represented by being painted over or punched in a plane, can be represented stereoscopically in the present embodiment.

Further, in the present embodiment, after the screen drawing unit 14 first draws the cloud object 53 on the far side, the cloud object 50 on the front side of the cloud object 53 is drawn. However, even when the screen drawing unit 14 determines that a plurality of semi-transparent objects overlap, it is not necessary to determine the drawing order of each semi-transparent object. For example, the screen drawing unit 14 may draw the cloud object 50 on the front side first, and then draw the cloud object 53 on the back side.

Also, each element of the pixel P stores a distance in floating point instead of RGB values. Compared to RGB values that can be expressed only in 256 steps in the past, it is possible to express distances with floating point values up to very large values. Therefore, the screen drawing unit 14 can correctly express the distance of the cloud object placed at a location very far from the viewpoint, and can appropriately express the density of the cloud object for drawing.

Note that the density of the translucent object is determined in the above-described embodiment. However, density can also be expressed by the formula 100%-transparency. Therefore, the transparency of a translucent object may be determined by replacing density with transparency.

[Second embodiment]
Next, a configuration example of an image drawing system according to a second embodiment of the present invention will be described with reference to FIGS. 10 to 16. FIG. In the image drawing system according to the second embodiment, it is possible to color an illustration-like image and draw an image with a richer sense of color than before.

<Functional Configuration Example of Information Processing Apparatus According to Second Embodiment>
FIG. 10 is a block diagram showing a configuration example of an information processing device 2A according to the second embodiment. The information processing device 2A replaces the information processing device 2 of the image drawing system 1 according to the first embodiment.

The information processing device 2A has the same configuration as the information processing device 2 according to the first embodiment. Then, the object information acquisition unit 13 acquires object information including the brightness of the object.

The screen drawing unit 14A draws a screen including an object on which a color corresponding to the brightness of the object is reflected, based on object information. A screen drawing unit 14A according to the second embodiment has a LUT (Look Up Table) 141 and a color determination unit 142 .

The LUT 141 is a table storing color information for each brightness of an object, and is used as an example of brightness-color correspondence information. The LUT 141 is provided for each object or each type of object. A detailed configuration of the LUT 141 will be described later with reference to FIG.

The color determining unit 142 determines the color of each pixel P on the screen 32 based on the color information corresponding to the luminance of the object read out with reference to the LUT 141 .

Since only luminance calculations are performed during the ray march processing performed by the object information acquisition unit 13, translucent objects are represented in shaded grayscale. After that, the color determination unit 142 determines the color with respect to the brightness of the cloud object. For example, the dark portions are colored with a shadow color, and the artistically colored bright portions are colored with a high brightness that matches the light source. Realized.

FIG. 11 is a diagram showing a configuration example of the LUT 141. As shown in FIG.
The LUT 141 is, for example, a one-dimensional table that stores color information for each brightness expressed between 0% and 100%. The color information is set as "a10", "a11", . . . "a1100" for each luminance. The color information may be different for each luminance or may be the same for some different luminances.

Conventionally, when the luminance value is close to 0%, the surface of the object tends to be expressed in black, and when the luminance value is close to 100%, the surface of the object tends to be expressed in white. However, the color determination unit 142 refers to the LUT 141 to determine the color. For example, if the brightness is close to 0%, the surface of the object is strongly expressed in purple, and if the brightness is close to 100%, the surface of the object is expressed in purple. For example, the surface of the object will be expressed in yellow. Therefore, for example, it is possible to express colors intended by the creator of the content (illustrator, etc.).

Also, the LUT 141 is set for each object. In FIG. 11, the LUT 141 is set for different objects such as objects objA1, objA2, objB1, . However, the same LUT 141 may be set for different objects such as objects objA1 and objB2.

<Example of Screen Rendering Process According to Second Embodiment>
Next, a detailed example of screen drawing processing according to the second embodiment will be described.
FIG. 12 is a flowchart illustrating an example of detailed processing of screen drawing processing according to the second embodiment. The screen drawing process shown in FIG. 12 replaces the screen drawing process (S4) performed by the screen drawing section 14 according to the first embodiment shown in FIGS.

Since the processing of steps S21 to S24 has already been described with reference to FIG. 8, detailed description thereof will be omitted.

If all the pixels P in the screen 32 have been processed in step S21 (YES in S21), the screen drawing unit 14A performs color processing for all the pixels P in the single screen 32 shown in FIG. is determined (S26). If the colors of all the pixels P in the screen 32 have not been determined (NO in S26), the screen drawing unit 14A performs color determination processing on the unprocessed pixels P (S27), and returns to step S26. to continue processing.

On the other hand, if the colors of all the pixels P in the screen 32 have been determined (YES in S26), the screen drawing unit 14A, based on the density of the object determined in step S24 and the color determined in step S27, The screen is drawn according to the position of the player (S25).
After that, the screen drawing unit 14A returns the process to the screen output process (S5) shown in FIG. By the screen output process, the screen 32 is displayed on the display device 4 in the color determined for each pixel P in the second embodiment.

Next, a detailed example of the color determination process shown in step S27 of FIG. 12 will be described.
FIG. 13 is a flowchart illustrating an example of detailed processing of color determination processing.

First, the screen drawing unit 14A acquires the LUT 141 linked to the object whose color is to be determined from the RAM 24, the non-volatile storage 28, or the like shown in FIG. 2 (S41).

The screen drawing unit 14A then refers to the LUT 141 and determines the color of the pixel P corresponding to the luminance (S42).
After that, the screen drawing unit 14A returns the processing to the determination processing (S26) for color determination for each pixel P shown in FIG.

In the information processing apparatus 2A according to the second embodiment described above, the screen drawing unit 14A decides the color for the luminance and draws the screen, so that the color that the content creator intended is different from the conventional color. It is possible to express an image with

Also, when an illustrator draws a screen, he expresses shadows and a sense of distance from the viewpoint of brightness and saturation. The LUT 141 is used to flexibly respond to such expressions. By assigning brightness to colors, it is also possible to insert another color into the intermediate color, thereby enhancing the expression of the rendered color.

The screen drawing unit 14A also determines the color of the object according to the brightness of the object, and draws the object in the determined color. Therefore, it is possible to reduce the processing load for determining the color of the object. As described above, the information processing apparatus 2A only performs the ray march process for calculating only the luminance, so that the amount of information required for calculation can be reduced. Therefore, the object color determination method performed by the information processing apparatus 2A can also contribute to speeding up the ray march processing.

Note that the screen drawing unit 14A may be used alone, separately from the process of determining the density of the object according to the first embodiment. That is, the screen drawing unit 14A can read out the LUT 141 and determine the color from the luminance of each pixel P even in a form in which the processing for determining the density of the object according to the first embodiment is not performed. .

[Modification of LUT]
Various forms are assumed for the LUT 141 . Here, three modifications of the LUT 141 will be described in order. Also, the following description shows a modified example of the LUT 141 set for a certain object (for example, object objA1).

(First modification of LUT)
FIG. 14 is a diagram showing a configuration example of the LUT 141A according to the first modified example.
The LUT 141A is a table in which color information is stored for each luminance and each tint of an object, and is used as an example of luminance-hue-color correspondence information. The LUT 141A is a two-dimensional table that stores color information for each brightness expressed between 0% and 100% and for each tint set for a scene. The tint is, for example, a value specified for each scene by the creator of the content. The color is set in the range of "0" to "255" for each element of RGB according to the RGB color system. Boxes shown in FIG. 14 and subsequent figures represent cells constituting the table of the LUT 141 shown in FIG. 11, and each box stores one piece of color information.

The LUT 141A is provided for each object or each type of object. The screen drawing unit 14A shown in FIG. 10 has an LUT 141A and a color determining unit 142. FIG.
Therefore, the color determining unit 142 determines the color of each pixel P on the screen 32 based on the color information corresponding to the luminance of the object read out with reference to the LUT 141A.

By having the LUT 141A in the screen drawing unit 14A in this way, it is possible to express colors intended by the creator of the content for each scene. For example, as the color tones set for a scene, various colors such as orange for an evening scene and yellow for a sunny scene are assumed.

(Second modification of LUT)
FIG. 15 is a diagram showing a configuration example of the LUT 141B according to the second modification.
The LUT 141B is a table storing color information for each brightness of an object and for each distance from the viewpoint to the object, and is used as an example of brightness-distance-color correspondence information. The LUT 141B is a two-dimensional table that stores color information for each luminance expressed between 0% and 100% and for each distance from the viewpoint to the object to be colored. The distance to the object to be colored is specified from a short distance (eg, several meters) to a long distance (eg, several kilometers).

The LUT 141B is provided for each object or each type of object. The screen drawing unit 14A shown in FIG. 10 has an LUT 141B and a color determining unit 142. FIG.
Therefore, the color determination unit 142 determines the color of each pixel P on the screen 32 based on the color information corresponding to the brightness of the object read out with reference to the LUT 141B.

By having the LUT 141B in the screen drawing unit 14A in this way, it is possible to express the colors intended by the creator of the content for each scene. For example, when viewing an object in a normal landscape, the color of an object close to the viewpoint can be clearly seen, and the color of an object far from the viewpoint can be seen bluish due to air or the like. On the other hand, by storing color information for each distance from the viewpoint to the object in the LUT 141B, for example, an object close to the viewpoint is expressed bluish, and an object close to the viewpoint is expressed reddish. Expressions that are different from usual are possible.

(Third modification of LUT)
FIG. 16 is a diagram showing a configuration example of the LUT 141C according to the third modification.
The LUT 141C is a table storing color information for each luminance, each tint, and each distance from the viewpoint to the object, and is used as an example of luminance-hue-distance-color correspondence information. The LUT 141C is a three-dimensional table combining the LUT 141A shown in FIG. 14 and the LUT 141B shown in FIG. The LUT 141C is also provided for each object or each type of object. The screen drawing unit 14A shown in FIG. 10 has an LUT 141C and a color determining unit 142. FIG.
Therefore, the color determining unit 142 determines the color of each pixel P on the screen 32 based on the color information corresponding to the brightness of the object read out with reference to the LUT 141C.

The color determining unit 142 refers to the LUT 141C to determine the color. For example, the screen drawing unit 14A draws the foreground in a gaseous state with reduced color undulations, and draws the background with richer brightness and color. It is also possible to adjust the color such as to draw and control the drawing color.

Although the LUTs 141 and 141A to 141C are each configured as a table, a function that determines color information for each luminance may be used. In this case, the color determining unit 142 can apply a function to the brightness calculated for each pixel P to determine the color.

[Third embodiment]
<Configuration example of content distribution system>
Next, a configuration example of an image drawing system according to the third embodiment of the present invention will be described with reference to FIG. The image rendering system according to the third embodiment constitutes a content distribution system in combination with a content distribution server that distributes content.

FIG. 17 is a block diagram showing a hardware configuration example of the content distribution system 10. As shown in FIG.
The image drawing system 1 can be connected to a content distribution server 8 via a network N such as the Internet. In the following description, the image drawing system 1 includes the information processing device 2, but the image drawing system 1 may include the information processing device 2A.

The content distribution server 8 manages content, and distributes content to the information processing device 2 based on a content acquisition request from the authenticated information processing device 2 . Therefore, the information processing device 2 may store the content downloaded from the content distribution server 8 in an internal recording medium (such as the nonvolatile storage 28) of the information processing device 2, and read the content from the internal recording medium when reproducing the content. . Alternatively, the information processing device 2 may receive content streamed from the content distribution server 8 and cause the display device 4 to display the content.

(Configuration example of content distribution server)
The content distribution server 8 is an example of a calculator that operates as a computer. This content distribution server 8 includes a CPU 81 , a GPU 82 , a ROM 83 and a RAM 84 , a non-volatile storage 86 and a network interface 87 which are connected to a bus 85 .

The CPU 81 reads the program code of the software that implements each function according to the present embodiment from the ROM 83, loads it into the RAM 84, and executes it. Variables, parameters, etc. generated during the arithmetic processing of the CPU 81 or GPU 82 are temporarily written in the RAM 84 , and these variables, parameters, etc. are read by the CPU 81 or GPU 82 as appropriate.

When the content distribution server 8 is configured to stream-distribute the content to the information processing device 2, the content distribution server 8 performs a process of calculating a three-dimensional image in almost real time based on the operation data received from the information processing device 2. . Therefore, the GPU 82 performs processing necessary to draw a three-dimensional object based on operation signals received from the information processing device 2 via the network interface 87, for example. The image drawn by the GPU 82 is streamed to the information processing device 2 via the network interface 87 as image data, and the image is displayed on the display device 4 connected to the information processing device 2 . As shown in FIG. 2, the GPU 82 and the CPU 81 may be configured separately, or the GPU 82 may be incorporated inside the CPU 81 .

As the nonvolatile storage 86, for example, HDD, SSD, flexible disk, optical disk, magneto-optical disk, CD-ROM, CD-R, magnetic tape, nonvolatile memory, or the like is used. The nonvolatile storage 86 stores an OS, various parameters, and a program for making the content distribution server 8 function. The ROM 83 and non-volatile storage 86 record programs and data necessary for the operation of the CPU 81, and are computer-readable non-transitory storage media storing programs executed by the content distribution server 8. Used as an example.

For example, a NIC or the like is used as the network interface 87, and various data can be transmitted/received to/from the information processing device 2 via a LAN, a dedicated line, or the like connected to the terminal of the NIC.

In the content distribution system 10 according to the third embodiment described above, the information processing device 2 receives the content distributed from the content distribution server 8 . Therefore, the information processing apparatus 2 can easily add content, apply correction patches, and the like.

Further, the information processing device 2 can output the content streamed from the content distribution server 8 to the display device 4 as it is. Therefore, the information processing device 2 does not require the high-performance CPU 21 and GPU 22 . Therefore, the information processing device 2 may be configured by a terminal such as a smart phone. Further, since the content is distributed from the content distribution server 8, the information processing device 2 may be configured without the optical drive 29. FIG.

The present invention is not limited to the above-described embodiments, and can of course be applied and modified in various other ways without departing from the gist of the present invention described in the claims.
For example, each of the embodiments described above is a detailed and specific description of the configuration of the device and system in order to explain the present invention in an easy-to-understand manner, and is not necessarily limited to those having all the configurations described. Further, it is possible to replace part of the configuration of the embodiment described here with the configuration of another embodiment, and furthermore, it is possible to add the configuration of another embodiment to the configuration of one embodiment. It is possible. Moreover, it is also possible to add, delete, or replace a part of the configuration of each embodiment with another configuration.
Further, the control lines and information lines indicate those considered necessary for explanation, and not all control lines and information lines are necessarily indicated on the product. In practice, it may be considered that almost all configurations are interconnected.

DESCRIPTION OF SYMBOLS 1... Image drawing system 2, 2A... Information processing apparatus 3... Operation controller 4... Display device 8... Content delivery server 10... Content delivery system 11... Input reception part 12... View point acquisition part 13... Object information acquisition unit 14 Screen drawing unit 15 Screen output unit 30 Virtual camera 31 Angle of view 32 Screen 60 Distance-density curve 65 Approximation curve 141, 141A to 141C LUT , 142 ... color determination unit

Claims (9)

a viewpoint acquisition unit that acquires a viewpoint in a three-dimensional virtual space;
an object information acquisition unit that acquires object information indicating whether each of the plurality of objects placed in the three-dimensional virtual space is an opaque object or a translucent object;
When it is determined from the object information that one object and another object among the plurality of objects are the translucent objects, the one object is selected according to the distance from the viewpoint to the other object. a screen drawing unit that draws a screen including the one object and the other object based on the density of the one object and the density of the other object obtained from the relationship between the distance and the density of
and a screen output unit that outputs the screen to a display device. The screen drawing unit determines the relationship between the distance and the density at which the change point at which the density changes according to the distance from the viewpoint is set, and determines the density of the one object and the density of the other object. The information processing apparatus according to claim 1, wherein a is obtained. the relationship between distance and density is stored for each pixel of the one object;
The information processing apparatus according to claim 2, wherein the change point is set according to the number of elements of the pixel. 4. The information processing apparatus according to claim 3, wherein the three change points are stored in the pixel elements capable of storing RGB pixel values. 4. The information processing apparatus according to claim 3, wherein the four change points are stored in the pixel elements capable of storing RGBA pixel values. The information processing device according to claim 3, wherein the distance stored in the pixel is represented by a floating point number. The object information acquisition unit acquires brightness of the object as the object information,
The information processing apparatus according to any one of claims 1 to 6, wherein the screen drawing section draws a screen including the object reflecting different colors according to the brightness of the object. a procedure for obtaining a viewpoint in a three-dimensional virtual space;
obtaining object information indicating whether each of the plurality of objects placed in the three-dimensional virtual space is an opaque object or a translucent object;
When it is determined from the object information that one object and another object among the plurality of objects are the translucent objects, the one object is selected according to the distance from the viewpoint to the other object. a step of drawing a screen including the one object and the other object using the density of the one object and the density of the other object obtained from the relationship between the distance and the density of
A program for causing a computer to execute a procedure for outputting the screen to a display device. obtaining a viewpoint of a three-dimensional virtual space;
obtaining object information indicating whether each of the plurality of objects placed in the three-dimensional virtual space is an opaque object or a translucent object;
When it is determined from the object information that one object and another object among the plurality of objects are the translucent objects, the one object is selected according to the distance from the viewpoint to the other object. drawing a screen including the one object and the other object, using the density of the one object and the density of the other object obtained from the relationship between the distance and the density of
and outputting the screen to a display device.

Images