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1. 发明公开

EP4425363A1 THREE-DIMENSIONAL CAD SYSTEM 审中-实审
公开(公告)号：EP4425363A1
公开(公告)日：2024-09-04
申请号：EP21961615.8
申请日：2021-10-28
申请人： Core Concept Technologies Inc. , Ibaraki University
发明人： TAGUCHI, Tadaaki , INUI, Masatomo , KOMORI, Soichiro , TANAKA, Akio , Shimomura, Katsunori
IPC分类号： G06F30/10
CPC分类号： G06F30/10
摘要： Provided is a three-dimensional CAD system that is capable of displaying, at high speed, a shape including a curved surface in the form of a CSG representation. The present invention is provided with: a primitive generation unit (11) that generates a primitive by joining the edges of differential polyhedrons to configure curved surfaces and joining the curved surfaces via curved surface boundaries to configure a closed curved surface, the primitive being a set of points belonging to the inside of the closed curved surface, by using a differential polyhedron model, which is a set of differential polyhedrons including the coordinate values of the vertices of triangles, the normal vectors of the vertices of triangles, and curved line elements constituted of initial points and terminal points, as well as tangential vectors of the initial points and the terminal points, the initial points and the terminal points being constituted of the vertices of triangles; a storage unit (2) that stores CSG data representing a solid model in the form of a CSG representation by using a tree structure of set operations for the primitive; and a display processing unit (3) that obtains the intersection between the solid model and a ray from the intersection between the closed curved surface of the primitive and the ray through set operations based on the CSG data, and that calculates the position of reflection and the direction of reflection of the ray in the solid model.

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