Browse Prior Art Database

Solid Generation from Two 2D Views

IP.com Disclosure Number: IPCOM000113910D
Original Publication Date: 1994-Oct-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Masuda, H: AUTHOR [+2]

Abstract

A program is disclosed that solid models with planes, cylinders, cones, spheres, and tori can be generated from two orthographic views.

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Solid Generation from Two 2D Views

      A program is disclosed that solid models with planes,
cylinders, cones, spheres, and tori can be generated from two
orthographic views.

      Most conventional solid generation methods require three
orthographic views.  Some methods based on two-view input were
reported, but they are limited only in polyhedron with planes.  Our
method generates a solid model from two-view input by constructing
the missing third view automatically, and applying a solid generation
method based on three-view input.

      Our method first analyzes how curved surfaces appear in a
two-view.  The Figure shows 2D patterns that can be generated from
cylindrical surfaces whose axes are parallel to coordinate axes.
Such pattern list can be generated from cones, spheres, and tori
similarly.

      2D patterns are categorized by (1) topological structure, (2)
types of curves (strait, circular, or elliptic), (3) geometric
constraints among edges, such as parallel, perpendicular, and so on,
and (4) correspondence between vertices and edges in two views.  They
are stored in the database.  Suppose axes of cylinders, cones, and
tori are parallel to coordinate axes, all 2D patterns can be easily
obtained by analyzing surfaces.

      By using the database, the system searches 2D patterns from a
given two-view.  Since two-view consists of edges, this process is
done by detecting edges that match the above four criteria.  All
possible surface...