Subject:
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Re: Dimensions of the parts
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 13 Apr 1999 18:18:56 GMT
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Viewed:
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656 times
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Lars C. Hassing skrev i meddelandet
<57F1FE754246D211A98700805FB79145815508@aarhus>...
> Anders Isaksson wrote:
> > - Just don't include equality (=) in your collision test! (?)
>
> This would be my bet too. Allow for a small margin/overlap
> caused by rounding errors.
>
> Since you cannot tell anything about inside/outside of a part
> but only have a bunch of faces (triangles and quads), the idea
> of comparing every face in one part with every face in another
> part is very clever.
One could go further down the algorithmic lane, and construct a
'bounding box' or 'convex hull' to get some indication of
inside/outside. Not watertight though (think Lego trees :-)
It would be much faster if the BB or CH method works, as there are not
so many faces to compare (OTOH, creating the BB or CH takes time).
--
Anders Isaksson, Sweden
BlockCAD: http://user.tninet.se/~hbh828t/proglego.htm
Gallery: http://user.tninet.se/~hbh828t/gallery.htm
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Message is in Reply To:
 | | RE: Dimensions of the parts
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| (...) This would be my bet too. Allow for a small margin/overlap caused by rounding errors. Since you cannot tell anything about inside/outside of a part but only have a bunch of faces (triangles and quads), the idea of comparing every face in one (...) (25 years ago, 13-Apr-99, to lugnet.cad.dev)
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