Freeform Surface Modeling (5 pages)

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Freeform Surface Modeling

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Pages:
5
School:
West Virginia University
Course:
Mae 455 - Computer Aided Drafting/Design

Unformatted text preview:

Image from Jeff Leismer Image from Chad Dickman Freeform Surface Modeling This image cannot currently be display ed This image cannot currently be display ed Image from Michael Biery Image from Brent Liedke Image from Christopher Rock MAE 455 Computer Aided Design and Drafting Review of Sweep Operations Types of sweep operations are Elements of sweep operations are MAE 455 Computer Aided Design and Drafting 2 1 Types of Freeform Surfaces 1 Surfaces from points Point interpolation Surface is incident with a grid of points Control points Grid of points pull surface Not necessarily incident Point cloud Best fit to jumble of points E g laser scanned data MAE 455 Computer Aided Design and Drafting 3 Types of Freeform Surfaces 2 Surfaces from multiple sections Ruled surface Matching points on each curve are joined by straight lines Through curves loft Best fit of surface to curves If only two curves same as ruled MAE 455 Computer Aided Design and Drafting 4 2 Types of Freeform Surfaces 2 Surfaces from multiple sections Through curve mesh Best fit to two sets of curves one set for each direction Advanced variational sweep Similar to basic sweep but guide rails can be used to change size and orientation of cross section Sketch constraints may also be used for control of swept profile MAE 455 Computer Aided Design and Drafting 5 Types of Freeform Surfaces 2 Surfaces from multiple sections Bounded plane or surface Best fit to bounding curves Can sometimes also control edge tangency curvature to match adjacent face MAE 455 Computer Aided Design and Drafting 6 3 Types of Freeform Surfaces 3 Surface construction from existing surfaces Offset surface Offset surface is same perpendicular distance from original surface at every point Can also offset in specific directions Midsurface Midsurface is same perpendicular distance from both original surfaces at each point Both of these surfaces are associative MAE 455 Computer Aided Design and Drafting 7 Types of Freeform Surfaces 3



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