Special:
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[DAT] (requires LDraw-compatible viewer)
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Subject:
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Re: Object Orientation & DAT files & CLIPPING/WINDING
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Newsgroups:
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lugnet.cad.dev
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Date:
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Tue, 19 Oct 1999 13:25:53 GMT
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Viewed:
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437 times
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Steve Bliss wrote in message <380b3366.9260126@lugnet.com>...
> > Now the INVERT problem: • [snip]
> > NOTE:
> > if you had a non simetrical object, you will probably need an invert
> > matrix (with a negative determinant), besides the INVERT meta command.
>
> You'll always need to specify the inversion in the matrix, whether the
> subfile is asymmetrical or not. The matrix specifies the exact inversion
> to perform. The 0 INVERT is just a flag to the renderer, which says "Hey,
> rendering program! The next statement intentionally turns the subfile
> inside-out, so don't correct it."
No, you don't need to bother with the matrix. Use the 0 INVERT to tell
the renderer: "Hey, please turn the following subfiles inside-out".
Remember the example from stud2.dat:
1 16 0 -4 0 4 0 0 0 4 0 0 0 4 4-4cyli.dat
0 INVERT ON
1 16 0 -4 0 6 0 0 0 4 0 0 0 6 4-4cyli.dat
0 INVERT OFF
See also http://www.lugnet.com/news/display.cgi?lugnet.cad.dev:2956
Apart from that I fully agree with Steve's comments to Rui.
/Lars
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Message has 1 Reply:
 | | Re: Object Orientation & DAT files & CLIPPING/WINDING
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| (...) Yes the coded inversion is needed, for one big reason: The clipping-ready parts library must be compatible with non-clipping rendering programs, such as LDraw. So the inversions need to occur in the real commands, not in the clipping-extension (...) (25 years ago, 19-Oct-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Object Orientation & DAT files & CLIPPING/WINDING
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| (...) These are all assumptions/specifications which *should* be agreed upon by the L-CAD community, especially parts-authors and rendering program-writers. Agreement is only needed if we want to re-wire the parts library, to encourage (...) (25 years ago, 18-Oct-99, to lugnet.cad.dev)
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