Subject:
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Re: Comprehensive meta-command list
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Newsgroups:
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lugnet.cad.dev
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Date:
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Sat, 9 Oct 1999 00:08:50 GMT
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Viewed:
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960 times
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Gary Williams skrev i meddelelsen ...
>
> Lars C. Hassing wrote in message <939391242.591663@ns.cci.dk>...
> > Gary Williams wrote in message ...
> > >
> > > In addition to being easier to comprehend, it has the advantage that each
> > > part and primitive file only has to concern itself with its own vertex
> > > order, and is not dependent on any other file. This is the primary • benefit.
> > > This makes parts and primitives truly modular and interchangeable.
> >
> >
> > "...not dependent on any other file..." Well, I hope you agree that files
> > depend on the inside/outside-definition of subfiles?
> > Otherwise a file wouldn't know whether or not to use the INVERT.
> > /Lars
>
>
>
> I'm not sure I follow. The rendering engine will always assume an implied
> INVERT whenever it encounters a negative orientation matrix determinant to
> cancel the effect of a mirror operation reversing the order of the • vertices.
> If a true inversion is desired then there will be an explicit INVERT tag
> before the subfile reference.
>
> No file ever needs to know how the vertices in its subfiles are oriented.
Right, a file should not bother whether subfiles use CCW or CW or none.
But it should know the orientation (inside/outside-definition) of the
subfiles.
> The only information that gets passed from A to B during rendering is the
> concatenated orientation/position matrix, its color, and the current INVERT
> state.
I agree.
/Lars
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Message is in Reply To:
 | | Re: Comprehensive meta-command list
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| Lars C. Hassing wrote in message <939391242.591663@ns.cci.dk>... (...) benefit. (...) I'm not sure I follow. The rendering engine will always assume an implied INVERT whenever it encounters a negative orientation matrix determinant to cancel the (...) (25 years ago, 8-Oct-99, to lugnet.cad.dev)
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