Subject:
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Re: Some Words To BFC
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 4 Apr 2000 13:56:02 GMT
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Leonardo Zide <leonardo@centroin.com.br> wrote in message
news:38E9EDA0.2C97D944@centroin.com.br...
> Michael Lachmann wrote:
> >
> > My suggestion is to keep the BFC statements as simple as possible. • Meaning we
> > should rather correct wrong defined
> > parts than letting the software correct wrong definitions!!!!
>
> That's why I droped out of the BFC discussion a long time ago, we are
> making this a big issue with proposals for a new extension when we could
> make things much simpler.
>
> If you know that a part is wrong, instead of adding a "0 INVERSE"
> statement (or whatever you call it now) you just change the orientation,
> I guess that Steve should be able to add a command that inverts the
> sequence of points of a quad/tri to LDAO easily (if he has enough free
> time). This way a program will only have to check for inverse matrixes
> on files that are outside the ldraw/parts directory.
It's not just a matter of knowing that a part is "wrong" and fixing it. The
problem is primitives where either the inner faces or the outer faces may
constitute the outside of a part. The box5.dat is a perfect example used in
many basic parts. When used for the top side of a brick, it is correctly
oriented. When used for the under side or "inside" of a brick the winding is
improper. That's a case where you use a "0 Inverted" tag on the under side
box5 to note that it's used inside-out.
Of course we do have the option of creating a whole new set of primitives,
but I think we wanted to avoid that option. Also discussed was the option of
rotating an inside-out primitive and inverting it, but someone found problems
with that idea as well.
-John Van
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Message has 1 Reply:
Message is in Reply To:
 | | Re: Some Words To BFC
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| (...) That's why I droped out of the BFC discussion a long time ago, we are making this a big issue with proposals for a new extension when we could make things much simpler. If you know that a part is wrong, instead of adding a "0 INVERSE" (...) (25 years ago, 4-Apr-00, to lugnet.cad.dev)
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