Ricoh Company, Ltd.

Lattice Technology, Inc.

Hiroshi Toriya

Toshiaki Sato

Tsuyoshi Harada

Makoto Yajima

Teiji Takamura

Akira Wakita

Hiroaki Chiyokura

A method of generating a free-form surface model includes the steps of applying linear transformation to a lattice polygon model to generate vertices of a free-form surface model corresponding to respective vertices of the lattice polygon model, and generating control points of cubic Bezier curves that connect the vertices of the free-form surface model, and that correspond to respective edges of the lattice polygon model.

Generation of free-form surface model by reversible rounding operation

A solid modeling method for modeling solids which include free-form surfaces calculates intersecting portions of two solids and storing calculated results as first data, stores free-form shapes of the two solids as second data, approximates free-form surface portions of the two solids by polyhedrons so as to describe the two solids in a form of polyhedrons, obtains a union, a difference or an intersection of the two solids by carrying out set operations on the polyhedrons, and returns the polyhedrons obtained by the set operations into solids including free-form surfaces based on the stored first and second data.

Solid modeling method

Growing community of inventors

Tokyo, Japan

Hiroshi Toriya