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 18:12:01 GMT
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Viewed:
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666 times
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Leonardo Zide skrev i meddelandet
<3712B018.76665708@centroin.com.br>...
>
> But how can the program know if a face from a piece is inside • another
> piece ? I've been only testing for intersections between faces.
If any two corners of a (planar) face, from one brick, is on opposite
sides of a (planar) face of the other brick, they must be intersecting
(not completely true, of course, as you have to take the size of the
faces into consideration too).
But perhaps I misunderstood your question? Do you mean: how to find
out if (for example) a peg is inside a hole, and still no _faces_
intersect?
I suppose you could do it (perhaps with a little knowledge of _which_
pieces goes inside things) by testing one piece against a 'bounding
box' of the other one (Or, to get more precision, the 'convex hull' -
computationally heavy).
Or you could edit your pieces and add invisible faces over openings,
so you have a face to test against. One piece _completely_ enclosed by
another would still not be detected this way.
A good newsgroup for this kind of problem is
comp.graphics.algorithms - if you don't already read it take a look!
--
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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| (...) But how can the program know if a face from a piece is inside another piece ? I've been only testing for intersections between faces. Leonardo (25 years ago, 13-Apr-99, to lugnet.cad.dev)
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