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# Solid-Division Method using Non-Manifold Model

IP.com Disclosure Number: IPCOM000116431D
Original Publication Date: 1995-Sep-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 50K

IBM

## Related People

Inoue, K: AUTHOR [+3]

## Abstract

Disclosed is a method for dividing a solid model in top-down geometry design.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 67% of the total text.

Solid-Division Method using Non-Manifold Model

Disclosed is a method for dividing a solid model in top-down
geometry design.

Product design is a top-down process; that is to say, the
overall structure and geometry of a product are determined first, and
the detailed structure and geometry are then determined step by step.
During the process, large parts are divided into smaller parts by
surfaces as shown in the Figure, and when the geometry of the product
is changed, the related geometry of each of its multiple parts is
also changed.

In this method, a product is a set of parts, and a part is a
set of "cells" in a non-manifold model.  A cell is an unit with a
non-zero volume in a non-manifold model.

Four primitive operations are used for top-down design.  These
operations manage the correspondence between parts, cells, and
surfaces dividing the cells.  "Division" does not create any new
parts, but divides an existing cell into smaller cells.  "Detaching"
creates a new part by separating some cells from an existing part.
The new part consists of the separated cells.  "Integration" unites
adjoining cells in a part into a single cell.  "Merging" unites two
parts into a part.  This operation does not affect the cell geometry.

Macro operations can be defined by combining primitive
operations for changing an assembly structure.  For example, a
dividing
operation and a detaching operation may divide a part consisting of a...