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Interference checking method

  • US 5,943,056 A
  • Filed: 06/21/1996
  • Issued: 08/24/1999
  • Est. Priority Date: 07/11/1995
  • Status: Expired due to Term
First Claim
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1. An interference checking method implemented using a computer system for checking the interference between a non-convex polyhedron and another object, comprising:

  • dividing the vertexes constituting said non-convex polyhedron into a plurality of vertex groups in each of which the difference between the coordinate values of a first axis (X-axis) of two arbitrary vertexes is zero or not more than a very small number ε

    ;

    producing a two-dimensional convex hull using a computer program stored in a memory for each of said groups of vertexes on the plane of second and third axes (YZ plane);

    producing three dimensional convex hulls using a second computer program stored in said memory by merging each pair of adjacent two-dimensional convex hulls, and thereafter sequentially merging adjacent three-dimensional convex hulls, thereby producing an intended convex hull of said non-convex polyhedron;

    checking the interference between said intended convex hull and said other object;

    disassembling said convex hull when said convex hull and said another object begin to interfere with each other; and

    checking the interference between said non-convex polyhedron and said other object.

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