Subject:
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Re: [Parts Tracker] More BFC Primitives
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Newsgroups:
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lugnet.cad.dev.org.ldraw
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Date:
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Mon, 8 Apr 2002 16:30:52 GMT
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Viewed:
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4018 times
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In lugnet.cad.dev.org.ldraw, Kyle McDonald wrote:
> First I'd like to suggest that *if* there is a 'standard' winding for
> LDRAW parts that it be CW. I make this suggestion based on the following:
[snip]
OK, sounds reasonable to me.
> (Though once the winding in the files is well documented, it should
> be trivial to programatically convert the files to a 'standard'
> winding. No?)
Yes.
> Second, on the subject of the 0 BFC INVERTNEXT meta command, I'd like
> to make sure I understand the suggested usage, and possibly make an
> argument for a change (If I understand it correctly)
[snip more]
You understand the usage correctly. Except there's no special tie
between a 'mirroring' subfile reference and the INVERTNEXT command.
Authors won't explicitly use one to 'undo' the other.
> My problem with this method is that now I have to examine the
> matrix watching for mirroring that I need to undo. Up until
> now I've been able to pass the matrix from the .DAT file straight
> on to the rendering engine, without examining the contents.
> I'd prefer to be able to continue to do that.
The problem here is that non-inverting mirroring is very commonplace in
LDraw parts, and in some places it can't be avoided (except by
inlining). For example, most parts that appear in a right- and
left-hand pair (wings, exhaust pipes, etc) are set up so that only one
file has the full DAT code -- the other file of the pair just has a
mirrored reference to its partner.
Doing a parse-time test on each subfile reference matrix (to determine
if the matrix is mirroring or not) should not be a big hit on
performance.
Steve
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Message has 1 Reply:
 | | Re: [Parts Tracker] More BFC Primitives
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| Steve Bliss wrote: > In lugnet.cad.dev.org.ldraw, Kyle McDonald wrote: > [snip more] > > You understand the usage correctly. Except there's no special tie > between a 'mirroring' subfile reference and the INVERTNEXT command. > Authors won't (...) (24 years ago, 9-Apr-02, to lugnet.cad.dev.org.ldraw)
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Message is in Reply To:
| | Re: [Parts Tracker] More BFC Primitives
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| Hello, Comments below... Travis Cobbs wrote: > In lugnet.cad.dev.org.ldraw, Steve Bliss writes: > >>In lugnet.cad.dev.org.ldraw, Tony Hafner writes: >> >>>In lugnet.cad.dev.org.ldraw, Steve Bliss writes: >>> >>>>>Um... Not to stir the pot or (...) (24 years ago, 6-Apr-02, to lugnet.cad.dev.org.ldraw)
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