JPH1139509A - Picture display optimizing system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optimizing system for picture display with which even the CG board of a low arithmetic capability can output an enriched image. SOLUTION: When the category of a line and a train is selected on a game starting picture, map data corresponding to the selected line and a table corresponding to the train class are read out of a ROM 18 and train driving simulation is started. Data are read out of an appearance data base 26 and the number of an object having an appearance flag is stored in a display object data base 32 as a display object number. This display number is read out of the display object data base 32 at the spot of appearance, and shape data in an object data base 25 are processed by an image processing part 21 and displayed on a display part 2. When an erasure flag is read out, that display object number is erased from the display object data base 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display system for displaying an image of a scenery along a railroad seen by a train driver, for example, when a train travels on a track, and more specifically, an image display system which does not appear on a screen. The present invention relates to a method for optimizing image display in consideration of a culling technique of how to omit from a calculation.

[0002]

2. Description of the Related Art In a conventional basic display method using CG (computer graphics), a ground is first created, and a three-dimensional model is arranged thereon to generate a database. Then, a conversion operation from three-dimensional to two-dimensional is performed only in a range where the model is visible when actually displayed. This makes it possible to obtain an image in a desired direction from a certain point.

[0003]

In the conventional image display, as a price of making the database smaller and making it possible to see the direction to be viewed, calculations are performed to the ones that are not displayed on the screen, so that a large amount of calculation capability is required. . For example, a calculation that only needs to be performed within the viewing angle in the viewing direction has been calculated to the side or just behind. For this reason, a calculation capability of 2 to 16 times is required as compared with a case where the calculation is performed only within the viewing angle.
It had to be reduced to 1/16. An object of the present invention is to provide a screen display optimizing method capable of outputting a luxurious image even with a CG board having a low computing capacity.

[0004]

When a camera moves on an orbit, the position and direction of the camera can be accurately predicted at an arbitrary point on the orbit, so that an object visible from any point on the orbit is calculated in advance. Can be. However, when the calculation result is used as data as it is, the data amount is the amount obtained by multiplying the conventional database by the length of the trajectory as compared with the conventional CG method. That is, when calculating an object visible in units of 1 m, if the length of the orbit is 10 km, the size of the database is 10,000 times larger, and it is not practical to have this database. The configuration is based on the method shown in FIG. 1. An object number is assigned to each of the arranged three-dimensional objects, and the object number is stored instead of the data of the object itself seen from each point on the trajectory. As a result, the data amount can be reduced to 1/10 or less. 2. What can be seen even if it moves back and forth a bit in the orbit does not change, so using this, objects that enter the visual field for the first time when traveling in the orbit, points that enter the visual field, objects that fall out of the visual field and their Only those points that fall outside the field of view are stored. Thus, it is not necessary to have data at predetermined intervals on the orbit, so that the data amount can be reduced. Even when traveling in the opposite direction, the same database can be used to specify what can be seen from the orbit without any problem. That is, an object that enters the visual field range by moving on the orbit is made to appear, and an object that is out of the visual field range is deleted. By adopting the methods 1 and 2 in this manner, the data amount is kept slightly larger than that of a normal CG database, even though the image processing is performed so that the display changes one after another by moving on the orbit. Can be. In addition, according to the above method, since it is necessary to always display from the beginning or end of the orbit, if you want to display any point on the orbit, it is necessary to update only the database from the beginning of the orbit and find it, Without screen display, it is possible to derive data at any point at a sufficient speed.

That is, in order to solve the above-mentioned problem, the present invention relates to a screen display system for processing a three-dimensional object which sequentially enters a field of view by traveling along a course such as a road or a track, and displaying an image. The shape data of the three-dimensional object entering the visual field range and an object database in which each shape data is assigned an object number; An appearance database consisting of distance data of a point that is out of range and disappearing, a flag indicating appearance or disappearance, and an object number for identifying the object, and a display that stores the number of the object currently in the visual field range Object database, and reads the appearance database as the course progresses, and displays the object number that appears for the appearance of the object in the display object database. Add, for eliminating the object number to disappear erased from the display object database, it is then processing the object data of the object number stored in the display object database configured to display images.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a train driving simulation game machine to which a screen display optimization method according to the present invention is applied. An operation unit and a display unit 2 are provided on a front surface of a chair 10 on which a player sits. The lower part of the chair 10 incorporates a bus shaker 9 that outputs a relatively low sound such as a bang and a bang in the train.

Speakers 12 are provided on the left and right of the display unit 2, and a title panel 7 is provided on the upper part. An overhead line voltmeter 11, a speedometer 5, and a brake pressure gauge 6 are arranged on the operation unit. The operation of the train can be performed by a mass control (master control) lever 3 and a brake lever 4. When the master control lever 3 is pulled forward, it can accelerate from a stopped state, and when the brake lever 4 is rotated counterclockwise as viewed from above, it works in a direction in which the degree of braking increases from a brake released state. A horn pedal 8 for emitting a horn is provided at the foot.

When a coin is inserted through a coin insertion slot (not shown), a screen for selecting a route and a round (type of train) is displayed on the screen, and can be selected by an operation device 23 (see FIG. 2) not shown. After selecting the route and the type of train, the simulation of train operation can be advanced by pressing the start button.

FIG. 2 is a block diagram showing an embodiment of the circuit of the game machine shown in FIG. When a coin is inserted into the coin-related device 22, the CPU 1
4 and the game is started. The backup memory 13 stores setting values such as the number of coins and the number of plays. The CPU 14 reads a program for controlling the entire game from the ROM 18, controls the image processing unit 21 according to the read program, and displays an initial screen on the CRT 2. The CPU 14 holds the display object number currently displayed in the display object database 32. Work RAM 17
Is an area for temporarily storing data when the CPU 14 performs calculations.

The communication RAM 15 stores a command from the CPU 14 relating to sound.
14 is used to confirm the sound status. A sound is generated by the sound system circuit 16, and various sounds and sounds during driving are output from the speaker 12 and the bus shaker 9. The ROM 18 has a map data memory section 19 for storing map data for creating an image of a route along a line of sight of a driver on each train line, in addition to a program for controlling the entire game. The map data memory unit 19 stores an object database 25 including shape data of an object along a line along the visual field range and an object number of the shape data of the object, distance data of a point where the object appears or disappears, An appearance database 26 including flags indicating appearance and disappearance of an object and an object number for identifying the object is stored in correspondence with the distance data. Also, checkpoint data memory units 20-1 to 20-n for storing a large number of checkpoint data tables indicating whether to stop or pass at an intermediate station.
have.

FIG. 3 is a diagram showing an example of a track and a roadside scene for explaining a screen display optimizing method according to the present invention. It is assumed that the train travels on a track 31 as shown in FIG. 3, and a sign 27, a house 28, a building 29 and a post office 30 exist along the track 31. The shape data of the sign 27, the house 28, the building 29 and the post office 30 are stored in the object database 25 of the map data memory unit 19 of the ROM 18. The object database 25 is made up of object numbers and their shape data as shown in FIG. 4, and the signs 27, houses 28, buildings 29 and post office 30 are assigned object numbers 1, 2, 3 and 4, respectively. I have.

FIG. 5 is a diagram showing an example of a table of the appearance database. At the point A on the track 31 in FIG. 3, the house 28 of the object number 2 starts to enter the driver's field of view (the triangle 31a shown by the dotted line), and the sign 27 of the object number 1 is out of the field of view. At the point B, the building 29 with the object number 3 and the object number 4
Post office 30 in the driver's field of view (the triangle 31 indicated by the dotted line)
b) Start to enter. Point A is distance 0m, point B is distance 1
m and point C respectively correspond to a distance of 2 m.

[0013] When the train driving simulation is started, the CPU 14 reads out map data from the map data memory unit 19 and executes image processing. First, data corresponding to the current location is read from the appearance database 26. For example, if the point A on the trajectory 31 is the departure position, the object number 2 and the appearance flag are read, and the display object database 32
Is stored as the display object number. The object number 2 is read from the display object database 32, the shape data of the house 28 of the object number 2 is read from the object database 25, and the image is processed by the image processing unit 21 and displayed. Next, up to point B, a new object appears on the screen,
Since the currently appearing object, that is, the house 28 does not go out of view and disappear, the data between the points A and B is not written in the appearance database 26.

Next, the CPU 14 reads out the data corresponding to the point where the appearance and disappearance occur. Object number 3 at point B
And the appearance flags are read out, and the object numbers 3 and 4 are stored in the display object database 32 as the display object numbers. Thus, the display object database 32 stores 3 and 4 in addition to 2 as the display object numbers. At the point B, in addition to the shape data of the house 28 of the object number 2, the building 29 of the object numbers 3 and 4 and the post office 30
Is read out from the object database 25 and image-processed by the image processing unit 21 for display. At the point C, since the house 28 of the object number 2 is out of the field of view, the object number 2 is deleted from the display object database 32. When the point C is reached, the display object database 32 is sent with the erasure flag of the object number 2, so the screen shows the house 2 of the object number 2
8 is not displayed. FIG. 6 shows an example of the display object database.

[0015]

As described above, the present invention can be applied to roads,
In a screen display system for processing three-dimensional objects that sequentially enter a field of view while traveling along a course such as a track and displaying an image, an object number is assigned to the shape data of the three-dimensional object that enters the field of view of the course and each shape data. The attached object database and the distance data of the point where each three-dimensional object appears in the visual field range from which position on the course and disappears outside the visual field range, and whether it appears or disappears An appearance database comprising a flag indicating the object and an object number for identifying the object, and a display object database for storing the number of the object presently in the visual field range. For the appearance of, the object number that appears is added to the display object database, and for the disappearance, the object number that disappears is added from the display object database. Removed by It is configured to display an image by processing the object data of the object number stored in the display object database. Therefore, although the image processing is performed so that the display changes one after another while moving on the orbit, the amount of the database can be reduced, and a gorgeous image can be displayed even on a CG board with a low computing capacity. effective.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a train driving simulation game machine to which a screen display optimization method according to the present invention is applied.

FIG. 2 is a block diagram showing an embodiment of a circuit of the game machine in FIG. 1;

FIG. 3 is a diagram illustrating an example of a track and a roadside scene for explaining a screen display optimization method according to the present invention.

FIG. 4 is a diagram showing an example of a table of an object database.

FIG. 5 is a diagram showing an example of a table of an appearance database.

FIG. 6 is a diagram illustrating an example of a table of a display object database.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Train driving simulation game machine 2 ... Display part 3 ... Mascon lever 4 ... Brake lever 5 ... Speedometer 6 ... Pressure gauge 7 ... Title panel 8 ... Warning pedal 9 ... Bus shaker 10 ... Chair 11 ... Overhead voltmeter 12 ... Speaker DESCRIPTION OF SYMBOLS 13 ... Backup memory 14 ... CPU 15 ... Communication RAM 16 ... Sound system circuit 17 ... Work RAM 18 ... ROM 19 ... Map data memory unit 20-1 to 20-n ... Checkpoint data table 21 ... Image processing unit 22 ... Coin related Device 23 ... Operating device 24 ... Input / output control device 25 ... Object database 26 ... Appearance database 27 ... Display object database

Claims (1)

[Claims] 1. A screen display method for processing and processing three-dimensional objects that sequentially enter a field of view through a course such as a road or a track, and displaying the images, the shape data of the three-dimensional object entering the field of view of the course. And an object database in which an object number is assigned to each shape data; and a position where each of the three-dimensional objects appears in the visual field range from which position on the course and disappears from which position outside the visual field range. It has an appearance database consisting of distance data, a flag indicating appearance or disappearance, and an object number for identifying the object, and a display object database for storing the number of the object currently in the visual field range. Accompanied by reading the appearance database,
For the appearance of an object, the object number that appears is added to the display object database, and for the disappearance, the object number that disappears is deleted from the display object database, and the object number of the object number stored in the display object database is deleted. A screen display optimization method characterized in that an object data is arithmetically processed and displayed as an image.