Patent ID: 6720963
Filing Date: 2004-04-13
Classification: G06T

Abstract:
A three-dimensional CAD system comprising:means for setting a point element, and further setting a line element, a surface element and a solid element each defined using linear, area and volume coordinate parameters, respectively, said elements being adopted as basic graphic elements, wherein when said line element, said surface element and said solid element are each divided into line segments, surfaces and solids formed between an arbitrary point within said each element and an end point, a periphery line and a periphery surface of said element, respectively, said each linear, area and volume coordinate parameters express said arbitrary point by a length ratio, an area ratio and a volume ratio of said divided line segments, said surfaces and said solids, respectively; means for connecting a plurality of said basic graphic elements by sharing mutual boundaries, thereby setting up a basic graphic form; and a means for directly deforming said basic graphic elements constituting said basic graphic form to thereby create a desired solid form maintaining continuous differentiability between said graphic elements and excluding said point element.