CAD Development : 2990


CAD / Development / 2990	2989 \| 2991

Subject:	Re: Hidden surface removal, and vertex order in part/primitive DAT files
Newsgroups:	lugnet.cad.dev
Date:	Sun, 3 Oct 1999 02:38:06 GMT
Viewed:	713 times

On Sat, 2 Oct 1999 19:46:03 GMT, Jean-Pierre PARIS <Paris.Jean-Pierre@wanadoo.fr> wrote: > Sorry, but I think that the even/odd algorithm only work on 'correct' > solids. > For example, if you take a 'bad' box made of 6 faces that have holes > beween them, your algorithm can lit an inside face. And in some parts, > such a situation exists. Thus my first too that tries to suppres these > holes, which came after rounding coordinates numbers This isn't automatic, but what if the program interrogates the user to pick a side which is facing outward? From that information, the program could then mark-up all adjacent sides. If the program ran out of sides, it could re-interrogate for another side. This wouldn't be a usuable approach for an on-the-fly rendering program, but it would work for a utility which is fixing up parts in the library. Steve

Message has 2 Replies:

		Re: Hidden surface removal, and vertex order in part/primitive DAT files
Steve Bliss wrote in message <37f6c0d9.269680202@...et.com>... (...) Doh, you posted mere minutes before me and said the same thing. :) -Gary (25 years ago, 3-Oct-99, to lugnet.cad.dev)

		Re: Hidden surface removal, and vertex order in part/primitive DAT files
(...) Instead of asking the user, the program could first try to cast rays and then only if there are any faces left it asks the user. I've started writing my own converter and it worked correctly with the 'standard' bricks but had a few problems (...) (25 years ago, 3-Oct-99, to lugnet.cad.dev)

Message is in Reply To:

		Re: Hidden surface removal, and vertex order in part/primitive DAT files
(...) Sorry, but I think that the even/odd algorithm only work on 'correct' solids. For example, if you take a 'bad' box made of 6 faces that have holes beween them, your algorithm can lit an inside face. And in some parts, such a situation exists. (...) (25 years ago, 2-Oct-99, to lugnet.cad.dev)

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