Subject:
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Re: BFC and Primitives
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Newsgroups:
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lugnet.cad.dev.org.ldraw
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Date:
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Thu, 7 Mar 2002 00:06:22 GMT
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Viewed:
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551 times
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I quote Michael Lachmann, from MLCad file ReleaseNotes.txt:
Beginning with release V2.00 MLCad does no longer support BFC.
However the metacommand itself is still supported but has no effect on
drawing (BFC - BackFaceCulling was an experiment on improving the rendering
speed, MLCad release V2.00 and above is using another methode, which
improves the speed much more than BFC could ever do)
End of quote.
Your program benefits BFC just because you use back to front BSP tree
traversal. I guess MLCad 2.0+ uses front to back BSP tree traversal, and
scanline hidden surface removal.
For more info about scanline hidden surface removal, see BSP tree faq:
http://reality.sgi.com/bspfaq/whole.shtml
Question #9 is "HOW DO YOU REMOVE HIDDEN SURFACES WITH A BSP TREE?" and
explains front to back BSP tree traversal and scanline hidden surface removal.
I hope it helps,
Damien
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Message has 3 Replies:
 | | Re: BFC and Primitives
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| Hi. Damien Guichard wrote: > I quote Michael Lachmann, from MLCad file ReleaseNotes.txt: > > Beginning with release V2.00 MLCad does no longer support BFC. > However the metacommand itself is still supported but has no effect on > drawing (BFC - (...) (23 years ago, 7-Mar-02, to lugnet.cad.dev.org.ldraw)
| | | Re: BFC and Primitives
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| (...) rights to access the faq directory. :\ (...) Could you, would you, post the text from this item, or maybe even email me the FAQ document? I'd appreciate it. Steve (23 years ago, 7-Mar-02, to lugnet.cad.dev.org.ldraw)
| | | Re: BFC and Primitives
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| Also, I believe, that no matter whether you use Back Face Culling or not, Having the vertices wound correctly in the DAT files is still a good thing. In the absence of a standard winding, then Documenting in each part the way the polygons are wound (...) (23 years ago, 8-Mar-02, to lugnet.cad.dev.org.ldraw)
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Message is in Reply To:
| | Re: BFC and Primitives
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| (...) Some of those tools ( I know MLCad can use them ) already support them. On top of that those are not the only tools around! (...) This is just not true. In my program it make a big deal. In general, anytime you can quickly narrow down the (...) (23 years ago, 6-Mar-02, to lugnet.cad.dev.org.ldraw)
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