Browse Prior Art Database

System for Parametrically Reshaping Given 3D Solid Models

IP.com Disclosure Number: IPCOM000113513D
Original Publication Date: 1994-Sep-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Inoue, K: AUTHOR [+3]

Abstract

Disclosed is a system for parametrically reshaping a 3D solid model that was not parametrically designed. The system first extracts geometric information from the solid itself, such as (1) the topological structure and (2) the initial geometries. The user can then modify and control the shape of the solid by specifying (3) dimensional constraints such as the distances and angles between faces, edges, and vertices of the solid.

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System for Parametrically Reshaping Given 3D Solid Models

      Disclosed is a system for parametrically reshaping a 3D solid
model that was not parametrically designed.  The system first
extracts geometric information from the solid itself, such as (1) the
topological structure and (2) the initial geometries.  The user can
then modify and control the shape of the solid by specifying (3)
dimensional constraints such as the distances and angles between
faces, edges, and vertices of the solid.

      The shape of a solid model can be easily controlled if it is
defined by way of a topological structure and a collection of
dimensional constraints.  In this case, the geometries of the solid
can be derived from the topological and dimensional constraints by
constraint programming.  However, solids are not always defined by
using dimensions; there are various methods for defining solids
without dimensions, such as solid boolean operation and automatic
generation from orthographic views.

      To compensate for insufficiency of dimensional constraints, the
method in this article utilizes the initial geometries of the given
solid as constraints: new geometries are calculated from the
topology, dimensions, and some of the initial geometries, while
others that conflict with the topological and dimensional constraints
are automatically discarded.

      Conflict resolution is performed by using a minimal diagnosis
method to satisfy the constraints, and leads to the...