JP3606222B2 - Object image display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an object data creation method and an object image display device, and more particularly to a technique for creating object data of objects connected in an object space.
[0002]
[Prior art]
By applying computer graphics technology, objects such as game characters and game stages composed of polygons are placed in the object space, and the object space that can be seen from a moving viewpoint that follows the game character, a fixed viewpoint that looks at the game stage, etc. A so-called three-dimensional game system that displays a state on a display is widely used not only for an arcade game system but also for a home game system.
[0003]
In such a game system, when rendering an image, so-called smooth shading is often performed in which the joints between polygons constituting each object are inconspicuous.
[0004]
In smooth shading, Gouraud Shading, which is frequently used in game systems, has normal vectors at the vertices of each polygon in the object data, and the normal vectors and light sources of each vertex at the time of rendering. Based on the data (including light source color data and light source position data), the color data of each vertex is calculated. The color of an arbitrary point inside the polygon is calculated by interpolating the color data of each vertex.
[0005]
In Phong Shading, as in Gouraud shading, the normal vector is set at the vertex of each polygon in the object data. It is calculated by interpolating the normal vector of the vertex. Then, the color data of each point is calculated based on the normal vector and the light source data of that point.
[0006]
According to these smooth shadings, by making the shared vertex of adjacent polygons (vertices placed at the same position of adjacent polygons) have the same normal vector, the joints between those polygons become inconspicuous can do.
[0007]
[Problems to be solved by the invention]
In the conventional method, when creating object data, shared vertexes of polygons that make up an object have the same normal vector so that the polygon joints are not conspicuous. When objects are connected and arranged in an object space, it is difficult to presume a common vertex between objects, and no attempt has been made to make the joint inconspicuous.
[0008]
For this reason, for example, when a plurality of terrain block objects having a finite size are connected in an object space and an image is generated when viewed from an overhead viewpoint in the object space, a difference in brightness occurs at the joint of each terrain block object. As a result, the terrain is unnaturally expressed.
[0009]
The present invention has been made in view of the above problems, and an object of the present invention is to provide an object data creation method and an object image display device that can make a joint of objects connected in an object space inconspicuous. is there.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, an object data creation method according to the present invention is an object data creation method for creating object data related to a plurality of objects connected in an object space, wherein the connection part of the plurality of objects The object data is created such that a common normal vector is set at the vertex of the polygon corresponding to the polygon.
[0011]
The object image display device according to the present invention is an object image display device that displays an image of a plurality of objects connected in an object space based on object data related to the plurality of objects. It includes object data storage means for storing object data in which a common normal vector is set at the vertex of the corresponding polygon.
[0012]
According to the present invention, since a common normal vector is set at the vertices of the polygons corresponding to the connecting portions of the objects, the joints of the objects can be made inconspicuous by performing smooth shading. For example, a common normal vector may be set at the apex of the polygon corresponding to the connecting portion of the object regardless of the surface direction of the polygon (original normal direction).
[0013]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
[0014]
The object data creation method according to an embodiment of the present invention is implemented using a known personal computer system including a display 10, a CPU 12, a mouse 14, and a keyboard 16, for example, as shown in FIG. Here, known three-dimensional modeling software is installed in the CPU 12 by an information storage medium such as a CD-ROM (trademark). With this software, the user can create object data of an arbitrary three-dimensional object using the mouse 14 and the keyboard 16. The object data is supplied to the 3D modeling software or a known game machine. Then, the created three-dimensional object is placed in the object space, and the state viewed from the viewpoint set at an arbitrary position is displayed on the display 10 or a monitor connected to the game machine or a home television receiver. Can be made.
[0015]
Here, a method for creating object data of a terrain block object used in a game of navigating an aircraft in an object space will be described. In this game, the terrain block object installed in the object space can be viewed from the viewpoint of following the aircraft. A large number of terrain block objects are prepared and arranged on a plane corresponding to the ground in the object space. The ground in the object space is represented by the large number of terrain block objects.
[0016]
FIG. 2 is a flowchart for explaining the procedure of the object data creation method according to the embodiment of the present invention. As shown in the figure, when creating a terrain block object, first, a number of terrain block objects are provisionally created by using known three-dimensional modeling software or the like (S1001).
[0017]
3 and 4 are diagrams showing examples of the terrain block object temporarily created in S1001. As shown in these figures, the terrain block objects 18 and 26 that are temporarily created are arranged in, for example, a square ground area so as to be easily connected to other terrain block objects such as the terrain block objects 18 and 26, respectively. It is created against. The terrain block object 18 includes mountain polygons 20 and 22, and the terrain block object 26 includes mountain polygons 28 and 30. Since the polygons constituting the slopes of these mountain polygons 20, 22, 28, and 30 have different slopes, when a terrain block object is temporarily created by a known three-dimensional modeling software or the like, The normal vector set at the vertex of the polygon is, for example, the actual normal direction of each polygon. For this reason, a normal vector 24 having different directions is set at the polygon vertex 23 on the block periphery of the terrain block object 18. Similarly, a normal vector 32 of disjoint directions is also set for the polygon vertex 31 on the block periphery of the terrain block object 26. For this reason, even if the terrain block objects 18 and 26 in the temporarily created state are contiguously arranged on the plane of the object space and an image subjected to smooth shading such as Gouraud shading is generated, the terrain block objects 18 and 26 are generated. There will be a difference in brightness at the connected portion.
[0018]
Therefore, in the present embodiment, the polygon vertices 23 and 31 corresponding to the connection parts with other terrain block objects are selected (S1002), and a common normal vector is set there (S1003). That is, for example, the terrain block objects 18 and 26 are displayed on the display 10 by three-dimensional modeling software, and markers (for example, softimage (trademark, which is three-dimensional modeling software) are used as polygon vertices 23 and 31 that are connected to other terrain block objects. TAG, which is one function), is set, and normal vectors (common normal vectors) having the same value are set for the polygon vertices 23 and 31 on which the markers are set. For example, a vector having a vertical direction (upward) with respect to the ground surface may be employed as the common normal vector.
[0019]
5 and 6 are diagrams showing a state in which a common normal vector 34 is set for the polygon vertices 23 and 31 of the terrain block objects 18 and 26. FIG. The common normal vector 34 is set in the terrain block objects 18 and 26 in place of the normal vectors 24 and 32. That is, in S1003, the normal vectors 24 and 32 of the temporarily created terrain block objects 18 and 26 are edited, and the polygon vertices 23 and 31 at the block periphery are changed to the common normal vector 34.
[0020]
Thereafter, object data representing the terrain block objects 18 and 26 having the common normal vector 34 at the block periphery is output from the three-dimensional modeling software (S1004), and the operation is terminated. The object data includes, for example, vertex coordinates (local coordinates) of each polygon constituting the terrain block object, normal vectors set for each vertex, texture coordinates of each vertex, and the like. The outputted object data is included in software such as a game so that the terrain block objects 18, 26 and the like are spread on the ground surface and arranged in the object space. Then, by executing the software, a computer such as a game machine functioning as an image display device displays an image of the terrain block objects 18 and 26 spread on the ground surface.
[0021]
In this way, since the common normal vector 34 is set to the polygon vertices 23 and 31 corresponding to the concatenated portions of the terrain block objects 18 and 26, etc., by performing smooth shading such as Gouraud shading, these objects , And the ground level of the game for navigating the aircraft in the object space can be suitably expressed.
[0022]
【The invention's effect】
As described above, according to the present invention, since a common normal vector is set at the vertexes of the polygons that are connected portions of the objects, the joints between the objects can be made inconspicuous by performing smooth shading. Can do.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an external appearance of a computer system that implements an object data creation method according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a procedure of an object data creation method according to the embodiment of the present invention.
FIG. 3 is a diagram illustrating an object temporarily created by the object data creation method according to the embodiment of the present invention and a normal vector set to a connected vertex of the object.
FIG. 4 is a diagram illustrating an object temporarily created by the object data creation method according to the embodiment of the present invention and a normal vector set to a connected vertex of the object.
FIG. 5 is a diagram showing an object created by the object data creation method according to the embodiment of the present invention and a normal vector set to the connected vertex of the object.
FIG. 6 is a diagram showing an object created by the object data creation method according to the embodiment of the present invention and normal vectors set at the connected vertices of the object.
[Explanation of symbols]
10 Display, 12 CPU (Central Processing Unit), 14 Mouse, 16 Keyboard, 18, 26 Terrain Block Object, 20, 22, 28, 30 Mountain Polygon, 23, 31 Polygon Vertex, 24, 32 Temporary Normal Vector, 34
Common normal vector.

Claims (2)

In an object display device that displays an image of a plurality of objects connected in an object space based on object data related to the plurality of objects,
An object image display device comprising: object data storage means for storing object data in which a normal vector common to polygon vertices corresponding to the peripheral edge of each object is set. Software for causing a computer to function as an object image display device that is executed by a computer and displays an image of a plurality of objects connected in an object space based on object data related to the plurality of objects ,
Software for causing the computer to function as an object image display device including object data storage means for storing object data in which a normal vector common to polygon vertices corresponding to the peripheral edge of each object is set.

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