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RAY TRACING METHOD AND SYSTEM FOR DETERMINING VISIBLE PARTS OF SURFACES OF THREE-DIMENSIONAL OBJECTS AND THEIR PARAMETERS OF SHADING ACCOUNTING FOR LIGHT AND SHADOW VOLUMES
RAY TRACING METHOD AND SYSTEM FOR DETERMINING VISIBLE PARTS OF SURFACES OF THREE-DIMENSIONAL OBJECTS AND THEIR PARAMETERS OF SHADING ACCOUNTING FOR LIGHT AND SHADOW VOLUMES
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机译:确定三维物体表面可见部分及其阴影和阴影体积参数的光线跟踪方法和系统
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摘要
There is provided a system, method and article of manufacture for determining the visibility of surfaces and/or parts of surfaces of three-dimensional objects, which are projected on a view plane from data defining these surfaces, comprising: a) deriving data indicative of boundaries of projections of the surfaces on the view plane; b) determining (preferably, by recursion) a finite number of subdivisions of the view plane thereby providing perimeters of each of the subdivisions; c) determining points of intersection of the perimeter of one of the subdivisions with the boundaries of the surfaces projected on the view plane; d) determining the distribution of surfaces visible along the perimeter of the of one of the subdivisions by utilizing the points of intersection; and e) determining if the one subdivision is “simple enough” of “terminal” from at least the distribution of surfaces visible along the perimeter of the one subdivision. In a preferred embodiment of the present solution, the visibility of surfaces and/or parts of surfaces of three-dimensional objects projected on a view plane are determined using one or more “minimal rectangles or subdivisions” as defined further herein.
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