VISUALIZATION TECHNIQUE USING CG

摘要

PROBLEM TO BE SOLVED: To provide a visualization technique using a CG for preventing the occurrence of an unnatural deformed state even when multiplied by an enlargement magnification. SOLUTION: The visualization method using a CG is provided to express the three-dimensional shape of an object by using input/output data in finite element analysis. The outline on the element cross-section of the object is calculated by connecting each of the vertexes of the cross-section by using line segments based on cross-section constancy assumption being the basic assumption of a beam theory, and the outline of the axial direction is calculated by using a three-dimensional Bezier curve using position vectors and tangent vectors at the both ends of the axial direction. The position vectors of the respective vertexes of the element both end cross-sections necessary for expressing the element deformed shape with the three-dimensional Bezier curve and the tangent vectors of the axial outline at those vertex positions are calculated from displacement and the angle of rotation at the node positions of the element both end cross-sections already known as the output data of normal analytic software, and the position vectors are calculated from the node displacement and the angle of rotation based on the the cross-section constancy assumption of the beam, and the tangent vectors are calculated by interpolating the element deformed shape from the displacement and the angle of rotation at both end nodes and torsion. COPYRIGHT: (C)2005,JPO&NCIPI