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facet in CAD


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Posted

Facet: A three or four sides polygon that represents a piece (or section) of a 3D surface.

 

On a certain CAD-related webpage I found "facet" defined as above. Is it correct? Generally "facet" is not defined this way.

 

facet: http://www.thefreedictionary.com/facet

 

Please help.

Posted

In all (except solid modelling) 3d creations ACad uses similar things, but calls them faces. The command to draw one at a time is 3DFACE - you're asket for 3 or 4 points, then for the next 1 or 2 points to continue the next face.

 

Other ways of doing such in one go is to use PFace / 3dMESH / EdgeSurf / RevSurf / RuleSurf / TabSurf.

 

Using the newer solid modelling you generally don't get faces - you end up with regions, which may be curved (e.g. a cylindrical / spherical region). Though it "shows" them faceted according to some of ACad's settings - this is only to improve 3d graphics performance - it's not actually drawn as such.

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