System and method for replacing parametrically described surface features with independent surface patches
First Claim
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1. A system for replacing a direct surface manipulation (DSM) surface with an independent NURBS surface patch of a geometric model comprising:
- a computer system, wherein said computer system includes a memory, a processor, a user input device and a display device;
a computer generated geometric model stored in said memory of said computer system, wherein the geometric model is in a computer-assisted design (CAD) format; and
wherein a user using the computer system samples data points of the DSM feature, parameterizes the sampled data points, determines knot vectors for a fitted NURBS surface patch, sets-up an equation system, and solves the equation system for a CAD model.
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Abstract
A system and method for replacing a direct surface manipulation (DSM) surface with an independent NURBS surface patch of a geometric model. The method includes the steps of sampling data points of the DSM surface and parameterizing the sampled data points. The method also includes determining knot vectors for a fitted NURBS surface patch and setting-up an equation system. The method further includes the steps of solving the equation system for the geometric model.
49 Citations
26 Claims
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1. A system for replacing a direct surface manipulation (DSM) surface with an independent NURBS surface patch of a geometric model comprising:
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a computer system, wherein said computer system includes a memory, a processor, a user input device and a display device;
a computer generated geometric model stored in said memory of said computer system, wherein the geometric model is in a computer-assisted design (CAD) format; and
wherein a user using the computer system samples data points of the DSM feature, parameterizes the sampled data points, determines knot vectors for a fitted NURBS surface patch, sets-up an equation system, and solves the equation system for a CAD model. - View Dependent Claims (2, 3)
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4. A method for replacing a direct surface manipulation (DSM) surface with an independent NURBS surface patch of a geometric model, said method comprising the steps of:
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selecting a geometric model, wherein the geometric model is in a computer-aided design (CAD) format;
sampling data points of the DSM surface;
parameterizing the sampled data points;
determining knot vectors for a fitted NURBS surface patch;
setting-up an equation system; and
solving the equation system for a CAD model. - View Dependent Claims (5, 6, 7, 8, 9)
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10. A method for replacing a direct surface manipulation (DSM) surface with an independent NURBS surface patch of a geometric model, said method comprising the steps of:
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defining input parameters;
fitting two boundary curves with two NURBS curves satisfying a first predetermined tolerance;
aligning a parametric space of the two converted curves;
converting control points of the two NURBS curves into the boundary control points of the NURBS surface patch to be created; and
fitting the interior of the NURBS surface patch satisfying a second predetermined tolerance. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification