JP6446072B2 - Game program and game system - Google Patents

Description

  The present invention relates to a game program and a game system for realizing a game for displaying a virtual space image on a head-mounted display (hereinafter, HMD).

  Conventionally, a game in which a user operates a character or the like arranged in a virtual space while viewing an image of the virtual space displayed as a game screen on a display device is known. In such a game, a sentence explaining an object arranged in the virtual space, a character conversation, and the like are displayed on the game screen as subtitles. For example, the caption is displayed below an image captured by the virtual camera (see Patent Document 1) or displayed on the forefront so as to overlap the image captured by the virtual camera.

JP-A-2005-321965

  By the way, in recent years, games that can experience virtual reality (hereinafter referred to as VR) using the HMD (hereinafter referred to as VR-compatible games) have been realized. In a VR-compatible game, when a caption is displayed as an object ignoring depth information (depth information), if the caption overlaps with another object and enters the eyes, the user has difficulty in focusing, so-called depth violation is known. It has been. The depth violation is a factor that causes eyestrain and sickness to the user.

  As a countermeasure against such a depth violation, a method of arranging captions at a certain position (that is, a certain depth) away from the virtual camera in the virtual space can be considered. However, if an object (an object that is fixedly placed such as a character or a desk) is placed at the same position as where the caption is placed, the caption is buried in the object, making it difficult for the user to read the caption, It may become impossible to read at all.

  Accordingly, an object of the present invention is to provide a game program and a game system that make it easy to read subtitles arranged in a virtual space while suppressing eye strain and sickness due to a depth violation in a VR-compatible game.

  In order to solve the above-described problems, the game program according to the present invention provides a virtual space photographed by a virtual camera as a pair of virtual two-dimensional images having parallax so that the user can stereoscopically view the three-dimensional virtual space. A game program to be executed by a computer having a head-mounted display for display, wherein the computer moves the virtual camera in the virtual space, virtual space generation means for generating the virtual space in which an object is arranged, and movement of the virtual camera in the virtual space Means for disposing a planar element facing the virtual camera at a predetermined initial position relative to the virtual camera in the virtual space; whether the planar element is in contact with the object in the virtual space; Determining means for determining, when it is determined that the planar element is in contact with the object; Wherein the position of the planar element, the position changing means for moving in a direction closer to the virtual camera, and text drawing unit for drawing the text on the planar element, to function as a.

  According to the above configuration, when it is determined that the planar element is in contact with the object, the position of the planar element is moved in a direction closer to the virtual camera. As a result, the portion of the text drawn on the planar element that is buried in the object is completely eliminated or reduced. For this reason, it is possible to make it easier for the user to read text displayed as subtitles on the head-mounted display.

  In the above game program, the position changing means may move the position of the planar element in a direction closer to the virtual camera until it is determined that the planar element does not contact the object. According to this configuration, it is possible to reduce the portion embedded in the object in the text drawn on the planar element.

  The above-described game program causes the computer to function as a position change limiting unit that limits the position of the planar element changed by the position changing unit so as not to enter a range inside a predetermined distance from the virtual camera. May be. According to this configuration, it is possible to prevent the text on the planar element from becoming unreadable or difficult to read by the user due to the planar element being too close to the virtual camera.

  In the above game program, when the text drawing means draws the second text after drawing the first text on the planar element, the placement means is configured to draw the first text on the plane element. Regardless of the position of the planar element, the planar element for drawing the second text may be arranged at the predetermined initial position. According to this configuration, when the text currently drawn in the virtual space is switched to the next text, the position of the planar element is reset to the initial position. Thereby, the drawing position of the text can be moved away from the virtual camera as much as possible.

  In the above game program, when the first text and the second text have a predetermined relationship, the arrangement means sets the planar element for drawing the second text as the plane element. You may arrange | position in the same position as the said planar element by which the said 1st text was drawn. According to this configuration, when the first text and the second text have a predetermined relationship, the second text is drawn at the same position as the first text. The second text can be read after the first text without being changed.

  The game program causes the computer to function as a character size reducing unit that gradually or stepwise reduces the character size of text drawn on the planar element as the planar element approaches the virtual camera. May be. Normally, when the size of text drawn in the virtual space is constant in the virtual space, the closer the text is to the virtual camera, the larger the characters of the text appear to the user. However, according to this configuration, the character size reducing means reduces the character size of the text drawn on the plane element as the plane element approaches the virtual camera. It is possible to prevent the user from making the text difficult to read.

  In addition, a game system according to the present invention includes a program storage unit that stores the game program and a computer that executes the program stored in the program storage unit.

  ADVANTAGE OF THE INVENTION According to this invention, the game program and game system which make it easy to read the subtitles arrange | positioned in virtual space can be provided, suppressing the eye strain and sickness by the depth violation in a VR corresponding | compatible game.

It is a block diagram which shows the hardware constitutions of the game system which concerns on one Embodiment. It is a block diagram which shows the functional structure of the game device shown in FIG. It is the top view showing the three-dimensional virtual space, and the schematic diagram of the virtual space seen from the position of a virtual camera. FIG. 4 is a plan view showing a three-dimensional virtual space when the virtual camera shown in FIG. 3 approaches an object, and a schematic diagram of the virtual space seen from the position of the virtual camera. It is a flowchart which shows the flow of a text drawing process.

  Hereinafter, a game program and a game system according to embodiments of the present invention will be described with reference to the drawings.

[Hardware configuration]
FIG. 1 is a block diagram showing a hardware configuration of the game system 1. The game system 1 includes a game device 2 and a server device 3. The game apparatus 2 can communicate with another game apparatus 2 and the server apparatus 3 via a communication network NW such as the Internet or a LAN. The game apparatus 2 includes a CPU 10 which is a computer for controlling the operation thereof. The CPU 10 is connected to a disk drive 12, a memory card slot 13, an HDD 14 and a ROM 15 constituting a storage unit (program storage unit) via a bus 11, In addition, a RAM 16 is connected.

  The disk drive 12 can be loaded with a disk type recording medium 30 such as a DVD-ROM. On the disc-type recording medium 30, a game program 30a and game data 30b according to the present embodiment are recorded. The game data 30b includes various data necessary for the progress of the game, such as data necessary for forming a virtual space and sound data reproduced during the game. In addition, a card-type recording medium 31 can be loaded in the memory card slot 13, and save data indicating a play status such as a game progress can be recorded in accordance with an instruction from the CPU 10.

  The HDD 14 is a large-capacity recording medium built in the game apparatus 2 and records a game program 30a and game data 30b read from the disk-type recording medium 30, and save data and the like. The ROM 15 is a semiconductor memory such as a mask ROM or PROM, and stores a startup program for starting the game apparatus 2, a program for controlling an operation when the disk type recording medium 30 is loaded, and the like. The RAM 16 is composed of DRAM, SRAM, or the like, and reads a game program 30a to be executed by the CPU 10 or game data 30b necessary for the execution from the disk-type recording medium 30 or the HDD 14 in accordance with the game play status. To record temporarily.

  The CPU 10 further includes an HMD interface 17, an optical detection device interface 18, a graphic processing unit 19, an audio synthesis unit 20, an audio interface 21, a wireless communication control unit 22, and a network interface 23 via the bus 11. It is connected. The HMD interface 17, the photodetector interface 18, and the audio interface 21 are connected to the HMD 40, the photodetector 46, and the headphones 47, respectively.

  The HMD 40 can be worn on the user's head. The HMD 40 includes a pair of display units 41 (41a, 41b), an acceleration sensor 42, a gyro sensor 43, a light emitting unit 44, and a control unit 45. By mounting the HMD 40 on the user's head, a display unit 41a for the left eye and a display unit 41b for the right eye are respectively arranged in front of the left eye and the right eye of the user.

  The acceleration sensor 42 and the gyro sensor 43 constitute a motion detection system that detects the motion of the user's head. The acceleration sensor 42 detects, for example, the orientation of the HMD 40 with respect to the direction of gravity, that is, the inclination of the user's head. The gyro sensor 43 detects, for example, the angular velocity of the HMD 40, that is, the speed at which the user tilts or rotates the head. The motion information obtained from the acceleration sensor 42 and the gyro sensor 43 is sent to the graphic processing unit 19 and the audio synthesis unit 20 via the HMD interface 17.

  The light emitting unit 44 of the HMD 40, together with the light detection device 46, constitutes a position detection system that detects the position of the user's head. In the present embodiment, the light emitting unit 44 is, for example, a plurality of LED lights provided in the HMD 40 apart from each other. The light detection device 46 is fixedly disposed, for example, in front of the user, and detects the position of light emitted from the light emitting unit 44 of the HMD 40. The light detection device 46 acquires the position information of the user's head relative to the light detection device 46 by detecting the position of the light emitted from the light emitting unit 44. The position information may be used to correct the above-described motion information. The position information obtained from the light detection device 46 is sent to the graphic processing unit 19 and the audio synthesis unit 20 via the light detection device interface 18.

  In addition, the position detection system which detects the position of a user's head is not limited to this. For example, the position of the user's head may be detected by providing an optical sensor on the HMD 40 side and detecting the light emitted from the light emitting device arranged around the user with the optical sensor.

  The control unit 45 controls various devices included in the HMD 40 such as transmission of data from the acceleration sensor 42 and the gyro sensor 43 to the game apparatus 2 and transmission of a signal to the light emitting unit 44.

  The graphic processing unit 19 draws a game image including a three-dimensional virtual game space in accordance with an instruction from the CPU 10. For example, the graphic processing unit 19 generates a pair of virtual two-dimensional images having parallax so that the user can stereoscopically view a three-dimensional virtual space. That is, the graphic processing unit 19 generates a virtual two-dimensional image for left eye and right eye having parallax, which are captured by each of a pair of virtual cameras arranged in the virtual three-dimensional space. The pair of virtual two-dimensional images are converted into a moving image format, sent to the HMD 40 via the HMD interface 17, and displayed on the pair of display units 41a and 41b, respectively. Further, the graphic processing unit 19 sends to the HMD 40 in real time in accordance with the motion information and the position information related to the user sent from the HMD 40 and the light detection device 46 so as to give the user a sense of presence as if entering the virtual space. A pair of virtual two-dimensional images are changed.

  The audio synthesizer 20 reproduces and synthesizes digital sound data included in the game data 30b in accordance with instructions from the CPU 10. The sound data reproduced and synthesized by the audio synthesis unit 20 is decoded into an analog format and then sent to the headphones 47 via the audio interface 21 and output. As a result, the user who is playing this game can listen to the reproduced sound. The headphone 47 may be configured integrally with the HMD 40. In addition, the audio synthesis unit 20 is output from the headphone 47 in real time in accordance with the motion information and the position information sent from the HMD 40 and the light detection device 46 so as to give the user a sense of presence as if entering the virtual space. The sound to be changed may be changed. A speaker may be connected to the audio interface 21 instead of the headphones 47.

  The wireless communication control unit 22 has a 2.4 GHz band wireless communication module and is wirelessly connected to the controller 48 attached to the game apparatus 2 so that data can be transmitted and received. The user can input a signal to the game apparatus 2 by operating an operation unit such as a button provided in the controller 48.

  The network interface 23 connects the game apparatus 2 to a communication network NW such as the Internet or a LAN, and can communicate with other game apparatuses 2 and the server apparatus 3. Then, by connecting the game device 2 to another game device 2 via the communication network NW and transmitting / receiving data to / from each other, it is possible to perform multiplayer in which the game progresses synchronously in the same virtual space. .

[Functional configuration of game device]
FIG. 2 is a block diagram illustrating a functional configuration of the game apparatus 2 included in the game system 1. By executing the game program 30a of the present invention, the game apparatus 2 performs virtual space generation means 51, camera movement means 52, arrangement means 53, determination means 54, position change means 55, position change restriction means 56, text drawing means 57 and the character size reduction means 58. Each of these functions is composed of the CPU 10, HDD 14, ROM 15, RAM 16, graphic processing unit 19, audio synthesis unit 20, wireless communication control unit 22 and the like shown in FIG.

  The virtual space generation means 51 generates a three-dimensional virtual space having a predetermined extent. Various objects are arranged in the virtual space. A pair of virtual cameras are arranged in the virtual space.

  The camera moving means 52 moves a pair of virtual cameras in the virtual space. In the present embodiment, the pair of virtual cameras move in the virtual space according to the user's operation on the controller 48 and the movement of the head of the user wearing the HMD 40.

  The arrangement unit 53, the determination unit 54, the position change unit 55, the position change restriction unit 56, the text drawing unit 57, and the character size reduction unit 58 are configured to display text displayed as subtitles on the display unit 41 of the HMD 40 in the virtual space. Executes text drawing processing for drawing. The text includes, for example, a sentence for explaining an object placed in the virtual space, a conversation of characters placed in the virtual space, and the like.

  Specifically, the placement unit 53 places a planar element facing the virtual camera at a predetermined initial position with respect to the pair of virtual cameras in the virtual space. The determination unit 54 determines whether or not the planar element is in contact with an object in the virtual space. The position changing means 55 moves the position of the planar element in a direction closer to the virtual camera when it is determined that the planar element is in contact with the object. The position change restricting means 56 restricts the position of the planar element changed by the position changing means 55 so as not to enter a range inside a predetermined distance from the virtual camera. The text drawing means 57 draws text on the planar element. The character size reduction means 58 reduces the character size of the text drawn on the plane element gradually or step by step as the plane element approaches the pair of virtual cameras.

[Text drawing processing]
Next, the text drawing process executed by the game apparatus 2 will be specifically described with reference to FIGS.

  3A is a schematic plan view showing a three-dimensional virtual space S, and FIG. 3B is a view of the virtual space seen from the positions of the virtual cameras CL and CR shown in FIG. 2 is a schematic diagram of S. FIG. In the example shown in FIGS. 3A and 3B, a virtual object S is provided with a box object A1 that is an object A and a table object A2 on which it is placed. In addition, in the virtual space S, a pair of virtual cameras CL and CR are arranged on the left and right sides in order to capture a left-eye image and a right-eye image, respectively. These virtual cameras CL and CR are arranged by, for example, a crossing method (a method in which the optical axes cross each other). In FIGS. 3A and 3B, each object A1 and A2 is included in each angle of view. It is. Since the pair of virtual two-dimensional images taken by the pair of virtual cameras CL and CR have parallax, the user perceives the depth of the virtual space S shown in FIG. Hereinafter, when the pair of virtual cameras CL and CR are collectively shown, they are simply referred to as “virtual camera C”.

  When a predetermined condition is satisfied, a text drawing process for drawing text on the virtual space S is executed. The text drawing process is executed according to the position of the virtual camera C in the virtual space S, the user's operation on the controller 48, the progress of the game, and the like. For example, a predetermined object A in the virtual space S is set to display a text for explaining the object A. In the example shown in FIGS. 3 and 4, when the user operates the controller 48 to bring the virtual camera C close to the box object A1 to a predetermined range and open the box object A1, the setting is made for the box object A1. A text drawing process for drawing the text is executed.

  In the text drawing process, first, the placement unit 53 places the planar element P facing these at a predetermined initial position with respect to the virtual camera C. This plane element P is for drawing the text T on it. The planar element P may be a transparent or translucent plane, for example, or may be a plane possessed by a transparent plate-like object, for example.

  In the present embodiment, the initial position at which the planar element P is arranged is a position away from the virtual camera C (for example, the intermediate point C1 between the pair of virtual cameras CL and CR) by a predetermined distance L1. The initial position may be different in the direction to the virtual camera C and the distance from the virtual camera C for each type of text to be drawn and each object to be described. For example, when the description of the object A is drawn by the text drawing process, the initial position is that the center point C2 of the plane element P is located on a straight line connecting the object A and the virtual camera C (for example, the above-described point C1). You may set as follows. For example, when a character conversation is drawn by text drawing processing, the initial position is set so that the center point C2 of the planar element P is located on a straight line extending equidistantly from each of the pair of virtual cameras CL and CR. May be.

  Then, the determination unit 54 determines whether or not the planar element P is in contact with the object A in the virtual space S. In the present embodiment, the contact determination between the planar element P and the object A is performed by determining whether or not the center point C2 on the planar element P is in contact with the object A. That is, in the present embodiment, when the center point C2 on the plane element P is in contact with the object A in the virtual space S, the determination unit 54 determines that the plane element P is in contact with the object A. Further, when the center point C2 on the plane element P is not in contact with the object A in the virtual space S, even if a point other than the center point C2 on the plane element P is in contact with the object, the determination unit 54 It is determined that the planar element P is not in contact with the object A.

  In the example shown in FIG. 3A, the center point C2 on the plane element P is not in contact with the object A in the virtual space S. Therefore, the position of the plane element P is not changed from the initial position, and the text T is drawn on the plane element P at the initial position by the text drawing means 57. Note that the method of determining contact between the planar element P and the object A by the determining unit 54 is not limited to the above-described method. For example, the point on which the determination unit 54 determines whether or not it is in contact with the object A may not be the center point C2 on the plane element P, but may be another point on the plane element P. It may be a plurality of points on the planar element P (for example, vertices of the planar element P).

  FIG. 4A is a schematic plan view showing the three-dimensional virtual space S, and shows a situation where the virtual camera C approaches the objects A1 and A2 from the position shown in FIG. FIG. 4B is a schematic diagram of the virtual space S that can be seen from the position of the virtual camera C shown in FIG.

  In the example of FIG. 4A, since the virtual camera C is close to the object A1, when the plane element P is in the initial position, the center point C2 on the plane element P is the object A1 in the virtual space S. (Refer to the thick broken line in FIG. 4A). Therefore, the position changing means 55 moves the position of the planar element P in a direction closer to the virtual camera C. In the present embodiment, the center point C2 on the planar element P is changed to a position where it is determined that the object does not contact the object A1 (in the example shown, a position away from the point C1 by a distance L2 shorter than the distance L1). Then, the text drawing means 57 draws the text T on the planar element P whose position has been changed.

  Thus, since the position of the plane element P is changed to a position where the center point C2 does not contact the object A1, the drawn text T can be prevented from being buried in the object A1. Even if the position or direction of the virtual camera C is changed after the position of the planar element P is changed, the position of the planar element P is not changed and is fixedly arranged in the virtual space S. However, the planar elements P may be controlled to be rearranged according to changes in the position and direction of the virtual camera C.

  The closer the plane element P is to the virtual camera C, the larger the text T is displayed in the image taken by the virtual camera C. Therefore, in the present embodiment, when the text T is drawn on the planar element P whose position has been changed, the character size reducing means 58 changes the character size according to the position of the planar element P. Specifically, the character size reducing means 58 reduces the character size of the text T drawn on the plane element P as the plane element P approaches the virtual camera C. The character size reduction means 58 may change the character size continuously and gradually according to the change in the distance from the virtual camera C to the planar element P, or may change it stepwise. Thereby, even if the position where the text T is drawn changes, the size of the text T displayed on the HMD 40 can be made completely or substantially constant.

  In the present embodiment, the position of the planar element P is limited by the position change limiting means 56 so as not to enter the range inside the predetermined distance L3 from the virtual camera C. This prevents the text T on the plane element P from becoming unreadable to the user or difficult to read by the plane element P being too close to the virtual camera C.

  That is, even if the center point C2 comes into contact with the object A when the distance from the virtual camera C of the plane element P becomes equal to or greater than the distance L3, the distance from the virtual camera C to the inner side of the predetermined distance L3. Does not change the position of the planar element P. In this case, the position changing unit 55 changes the position of the planar element P to a predetermined position (for example, a position at a predetermined distance L3 from the virtual camera C) close to the virtual camera C within a position changeable range. As a result, the center point C2 is allowed to contact the object A exceptionally, and the portion embedded in the object A in the entire text T is reduced.

  When the text drawing means 57 draws text (hereinafter referred to as “first text”) on the plane element P and then draws another text (hereinafter referred to as “second text”), the placement means 53 Regardless of the position of the plane element P on which the first text is drawn, the plane element P for drawing the second text is arranged at a predetermined initial position. For example, in the example shown in FIGS. 4A and 4B, the planar element P is at a position changed from the initial position (position separated from the point C1 by a distance L2), but next, with the box object A1 When text about another object A different from is drawn, the plane element P is arranged at a predetermined initial position regardless of the position of the previous plane element P.

  However, when the first text and the second text have a predetermined relationship, the arrangement unit 53 uses a plane element for drawing the second text as a plane element for drawing the first text. Place in the same position. Here, the predetermined relevance is, for example, belonging to the same sentence, being a sentence about the same content, being a speech of the same character, being an explanation for the same object, and the like.

  For example, when a long sentence such as a long line of a character cannot be drawn on one plane element P at a time, the sentence is divided into a plurality of texts, and the divided text is sequentially drawn on the plane element P. In this case, when the user is reading the same sentence, if the drawing position of the text changes from the position after the position change to the initial position, the user refocuses the eyes. Is promoted. Therefore, in the present embodiment, when the first text and the second text have a predetermined relationship, the position to be focused by drawing the second text at the same position as the first text. The second text is read by the user after the first text without changing.

  FIG. 5 is a flowchart showing the flow of text drawing processing.

  First, the placement means 53 places the planar element P at the initial position (step S1). Next, the determination unit 54 determines whether or not the planar element P (in this embodiment, the center point C2 of the planar element P) is in contact with the object A in the virtual space S (step S2). The text drawing means 57 may draw the text on the plane element P between steps S1 and S2.

  When the planar element P is not in contact with the object A in the virtual space S (step S2: No), the position of the planar element P is fixed at the initial position. Then, the character size reducing unit 58 determines the character size corresponding to the initial position (step S6), and the text drawing unit 57 draws the text on the plane element P at the initial position with the determined character size (step S6). Step S7).

  When the planar element P is in contact with the object in the virtual space S (step S2: Yes), the position change limiting means 56 is configured to change the position of the planar element P when the position is determined to be not in contact with the object A. It is determined whether or not the position is within the position changeable range (step S3). In other words, the position change restriction means 56 determines that the position of the plane element P when the plane element P is moved in a direction closer to the virtual camera C until it is determined that the plane element P does not contact the object A is the predetermined position from the virtual camera C. It is determined whether or not it is located outside the distance L3.

  If within the position changeable range (step S3: Yes), the position changing means 55 moves the position of the planar element P in the direction closer to the virtual camera C until it is determined that it does not contact the object A. (Step S4). If it is outside the position changeable range (step S3: No), the position changing means 55 changes the position of the planar element P to a predetermined position (for example, from the virtual camera C) close to the virtual camera C within the position changeable range. The position is changed to a predetermined distance L3 (step S5).

  Thus, after the position of the planar element P is changed, the character size reduction means 58 determines the character size corresponding to the changed position (step S6), and the text drawing means 57 uses the determined character size, Text is drawn on the planar element P at the changed position (step S7).

  The text once rendered in this way is until a predetermined condition is satisfied (for example, until a certain time has elapsed after the drawing is started, or until the user performs a predetermined operation on the controller 48). Etc.) and continue to be drawn on the virtual space S (step S8: No). Then, steps S2 to S7 are repeated while the text drawing continues. That is, the drawing of the text continues, the virtual camera C moves after drawing the text on the plane element P, and the plane element P (in this embodiment, the center point C2 of the plane element P) becomes the object A. When contact comes, the position of the planar element P is changed.

  When the predetermined condition is satisfied and drawing of the text is finished (step S8: Yes), it is determined whether there is a next text to be drawn (step S9).

  If there is a next text to be drawn (step S9: Yes), it is determined whether or not there is a predetermined relationship between the next text and the previous text (step S10). If there is a predetermined relevance (step S10: Yes), the placement means 53 places the plane element P at the position where the previous text is drawn (step S11), and returns to step S2. If there is no predetermined relationship (step S10: No), the process returns to step S1 again, and the placement means 53 places the planar element P at the initial position.

  If there is no next text to be drawn in step S9 (step S9: No), the text drawing process is terminated.

  As described above, in the game system 1 according to the present embodiment, when it is determined that the plane element P is in contact with the object A, the position of the plane element P is moved closer to the virtual camera C. Let As a result, the portion of the text drawn on the planar element P that is buried in the object A is completely eliminated or reduced. For this reason, the text displayed as subtitles on the HMD 40 can be easily read by the user.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.

  For example, the hardware configuration described in the above embodiment is merely an example, and any configuration including an HMD 40 that displays a pair of virtual two-dimensional images having parallax may be used. For example, the acceleration sensor 42, the gyro sensor 43, the light emitting unit 44, the light detection device 46, and the like included in the HMD 40 may be omitted.

  Further, when the position changing unit 55 determines that the planar element P is in contact with the object A, it is only necessary to move the position of the planar element P in a direction closer to the virtual camera C. That is, the position changing means 55 is within the range in which the position of the plane element P can be changed, and even if there is a position where the plane element P does not contact the object A1 in the direction closer to the virtual camera C, the contact It is not necessary to move the planar element P to the position where it does not. Even in this case, the portion of the text drawn on the planar element P that is buried in the object A can be reduced. However, if the position changing means 55 moves the position of the plane element P in the direction closer to the virtual camera C until it is determined that the plane element P does not come into contact with the object A, it is drawn on the plane element P. The portion of the text that is buried in the object A can be reduced.

  Further, in the above embodiment, the position of the planar element P is restricted so as not to enter the range inside the predetermined distance from the virtual camera C. However, such a restriction may not be necessary. For example, instead of limiting the range in which the planar element P is repositioned, the distance that the virtual camera C approaches the object may be limited to provide an area around the virtual camera C where the planar element does not contact the object.

51 Virtual space generating means 52 Camera moving means 53 Arranging means 54 Judging means 55 Position changing means 56 Position change restricting means 57 Text drawing means 58 Character size reducing means A Object CR, CL Virtual camera P Plane element S Virtual space T Text

Claims (4)

A game program for causing a computer including a head-mounted display to display a virtual two-dimensional image having a parallax as a pair of virtual two-dimensional images having a parallax so that a user can stereoscopically view a three-dimensional virtual space,
The computer,
Virtual space generation means for generating the virtual space in which an object is arranged;
Camera moving means for moving the virtual camera in the virtual space;
Arrangement means for arranging a planar element facing the virtual camera at a predetermined initial position with respect to the virtual camera in the virtual space;
Determining means for determining whether or not the planar element is in contact with the object in the virtual space;
Position changing means for moving the position of the planar element in a direction closer to the virtual camera when it is determined that the planar element is in contact with the object ;
Text drawing means for drawing text on the planar element; and
Character size reduction means for reducing the character size of text drawn on the plane element gradually or step by step as the plane element approaches the virtual camera;
As a game program to function as. When the text rendering means renders the second text after rendering the first text on the planar element, the placement means associates the first text and the second text with a predetermined relationship. If no sex, regardless of the position of said planar element in which the first text is drawn, and arranging the planar element to draw said second text to the predetermined initial position, the When the first text and the second text have a predetermined relationship, the plane element for drawing the second text is the plane element on which the first text is drawn. The game program according to claim 1, wherein the game program is arranged at the same position .   The predetermined initial position is set such that a direction with respect to the virtual camera and a distance from the virtual camera are different for each type of text drawn by the text drawing unit and each object described by the text. Item 3. A game program according to item 1 or 2. A program storage unit storing the game program according to any one of claims 1 to 3 ,
A game system comprising: a computer that executes a program stored in the program storage unit.

Images