Method and apparatus for generating representations of 3-dimensional objects
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United States of America Patent
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Apr 23, 1991
Issued Date -
N/A
app pub date -
Mar 13, 1990
filing date -
Jun 7, 1986
priority date (Note) -
Expired
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Abstract
A computer aided design (CAD) system has the capability of operating in either a 2D or a 3D mode. In 2D mode, the system uses only instructions contained in a 2D instruction memory and executes only instructions relating to 2D geometry. Upon receipt of a command relating to 3D geometry, the system performs a 2D to 3D transformation, performs a topolgy check, transfers control to a 3D instruction memory and performs instructions relating to 3D geometry.
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