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    • 47. 发明授权
    • Shape model generation device for generating shape models with a reduced
number of polygons while maintaining quality of the two-dimensional
image of the generated shape models
    • 形状模型生成装置,用于生成具有减少的多边形数量的形状模型,同时保持生成的形状模型的二维图像的质量
    • US5754182A
    • 1998-05-19
    • US555035
    • 1995-11-08
    • Tadashi Kobayashi
    • Tadashi Kobayashi
    • G06F17/50G06T15/00G06T17/20G06T17/30G06T17/00
    • G06T17/20
    • An image generation system having a shape model generation device for generating a set of polygons which approximates a given solid having a curved surface and output vertex coordinates of each polygon in a screen coordinate system. An image generation device is provided for generating images for each polygon on receiving the vertex coordinates, and an image display device displays the generated images. The shape model generation device divides the solid into a set of polygons in a virtual-space, where the number of polygons used for dividing the solid into polygons is minimized while maintaining a high-quality display image. The set of polygons are projected onto a screen based on a designated view point and direction in the virtual-space, and the vertex coordinates of each polygon is transformed into two-dimensional screen coordinates. An edge judgment unit is provided in the shape model generation device for judging whether any side of each screen-projected polygon constitutes a part of an outline of the set of screen-projected polygons. An edge change unit in the shape model generation device generates a new vertex in the virtual-space on any side which constitutes a part of the outline, and the coordinates of the new vertex are transformed into two-dimensional screen coordinates. A polygon division unit is provided for dividing a screen-projected polygon including any side which constitutes a part of the outline into smaller screen-projected polygons at the new vertex.
    • 一种图像生成系统,具有形状模型生成装置,用于生成近似于具有曲面的给定实体的多边形集合,并且在屏幕坐标系中输出每个多边形的顶点坐标。 提供图像生成装置,用于在接收顶点坐标时生成每个多边形的图像,并且图像显示装置显示所生成的图像。 形状模型生成装置将实体分割成虚拟空间中的一组多边形,其中用于将实体分割成多边形的多边形的数量最小化,同时保持高质量的显示图像。 基于虚拟空间中的指定视点和方向将多边形组投影到屏幕上,并且将每个多边形的顶点坐标转换为二维屏幕坐标。 在形状模型生成装置中设置边缘判断单元,用于判断每个画面投影多边形的任一侧是否构成一组屏幕投影多边形的轮廓的一部分。 形状模型生成装置中的边缘变更单元在构成轮廓的一部分的任意一侧的虚拟空间中生成新的顶点,将新顶点的坐标变换成二维画面坐标。 提供多边形分割单元,用于将包括构成轮廓的一部分的任何一侧的画面投影多边形分割成新的顶点处的较小的屏幕投影的多边形。