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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Fri, 1 Oct 1999 22:02:16 GMT
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Viewed:
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702 times
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Gary Williams wrote:
>
> I'd vote for CW for two reasons:
>
> 1) 'Clockwise' is shorter than 'counterclockwise'.
I can't argue with that :)
> 2) CW is used more often than CCW in rendering applications (to my
> knowledge) because the normal of a CW-defined polygon points outward,
> instead of inward.
No way ! The front faces are CCW in 3DS Max, and quoting the OpenGL
1.2 specs. for glFrontFace() "mode: Specifies the orientation of
front-facing polygons. GL_CW and GL_CCW are accepted. The initial value
is GL_CCW."
Just use your right hand instead of the left and you'll get outward
normals. Do things just like when you try to imagine the signal of the
cross-product between two vectors.
> I'd also suggest that the standard comment read '0 CW' instead of '0
> CW-compliant'. Less chance for typographical error if the file was created
> manually.
You can also save a few bytes using only 0 (C)CW.
Leonardo
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