Subject:
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Re: Line in the Sand
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Newsgroups:
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lugnet.cad.dev
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Date:
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Mon, 20 Dec 1999 22:35:04 GMT
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Viewed:
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3058 times
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Steve Bliss wrote...
> In lugnet.cad.dev, Lars C. Hassing wrote:
>
> > If IsTransparent(Color) Then AccumClip = FALSE
> > takes care of solid non-16 colors (decorations) in parts used transparently.
> > And a similar check added to BFC() can take care of transparent non-16
> > colors in parts used as solids.
> > So the logic is OK again.
>
> Yes, it would render correctly, but it would also disable clipping more often
> than is required, in the case of mixed solid and transparent sections. Think of
> a submodel where the author used color 16, and the person using the submodel
> renders it as transparent. If clipping is turned off at the start of the
> submodel, then no part in that submodel could be BFC-ed, even if they were
> solid-colored.
I think this is a possible, but rare case. It can, however, be circumvented by
regarding DAT files from PARTS as special.
> > On second thoughts I don't think we need double-sided sections for decorations.
> > If a rendering program wishes to use BFC together with dither-transparency, it
> > can easily investigate whether there are non-16 colors in a transparent part.
> >
> > We should not put an unnecessary rule on the part author.
>
> I agree with not putting unnecessary rules on authors. I don't agree on
> renderers being required to find the solid colors in a transparent part.
Why not? Any information you can gather by simply analysing a DAT file
should not be required to be stated by the part author.
/Lars
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Message has 1 Reply:
 | | Re: Line in the Sand
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| (...) In that case, why are we wiggling about with this BFC extension stuff? Rendering programs can figure out what order vertices should be put in, and they can figure out which way a polygon is facing. They don't need all this extra effort from us (...) (25 years ago, 21-Dec-99, to lugnet.cad.dev)
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Message is in Reply To:
| | Re: Line in the Sand
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| (...) Yes, it would render correctly, but it would also disable clipping more often than is required, in the case of mixed solid and transparent sections. Think of a submodel where the author used color 16, and the person using the submodel renders (...) (25 years ago, 14-Dec-99, to lugnet.cad.dev)
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