Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Hidden surface removal, and vertex order in part/primitive DAT files
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Newsgroups:
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lugnet.cad.dev
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Date:
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Sun, 3 Oct 1999 02:46:43 GMT
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Viewed:
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812 times
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On Sat, 2 Oct 1999 14:15:02 GMT, "Gary Williams" <graywolf@pcpros.net>
wrote:
> My LDraw folder has seven DAT files with '0 CW*', none with '0 CCW*', and 30
> with '0 not CW*'.
>
> The seven '0 CW*' files are:
>
> ...
> PARTS\578.DAT
>
> Note that 578.DAT contains a suspicious comment :)
578 is compliant because it contains *only* subfile references, which have
been verified to not mess up (C)CW-ness. But that doesn't mean the
*subfiles* are compliant. It also assumes the compliant subfiles are
oriented the way the author (me) expected them: cylinders' surfaces facing
outward, disc facing upward.
The part about not knowing whether it's CW or CCW means I don't know if the
primitives are CW or CCW.
Here's the code:
0 CW-compliant (well, maybe CCW-compliant -- I haven't checked)
1 16 0 0 0 4 0 0 0 1 0 0 0 4 4-4edge.dat
1 16 0 80 0 4 0 0 0 1 0 0 0 4 4-4edge.dat
1 16 0 0 0 4 0 0 0 1 0 0 0 4 4-4disc.dat
1 16 0 0 0 4 0 0 0 80 0 0 0 4 4-4cyli.dat
1 16 0 80 0 4 0 0 0 -1 0 0 0 4 4-4disc.dat
Dote that on the last line, the disc is mirrored on Y to turn it upside
down.
Steve
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