Subject:
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Re: Clipping / CCW / CW / INVERT
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Newsgroups:
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lugnet.cad.dev
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Date:
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Fri, 8 Oct 1999 11:05:10 GMT
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Reply-To:
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Rui.Martins@link.=stopspammers=pt
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Viewed:
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492 times
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On Thu, 7 Oct 1999, Larry Pieniazek wrote:
> Steve Bliss wrote:
> >
> > Lots of good stuff in your post, Rui!
> >
> > On Wed, 6 Oct 1999 18:15:40 GMT, Rui Martins <Rui.Martins@link.pt> wrote:
> >
> > > So if a solid object is Opaque, then from any view point there are some
> > > faces that are invisible, because they are facing away from the viewer.
> >
> > (Side note: there are not actually any solids in LDraw. Only lines and
> > polygons).
> >
> > > From this we now know that "Opaque solids" can have some faces "Clipped"
> > > and that transparent object (solid or not) CAN'T have any faces clipped.
> >
> > Actually, since LDraw doesn't do shading, transparent surfaces *can* be
> > clipped. Only edges, the top-most solid surface, and the top-most
> > transparent surface will show up in the final rendered image.
>
> I believe this is incorrect, no? ALL transparent surfaces should appear,
I agree with this.
> if only to make a contribution to the color that underlying surfaces
> appear to be (consider a trans blue surface in front of a trans yellow
> in front of a white... )
that' wright, a program supporting transparent colors correctly (using
alpha blending) would do this just wright.
A 3D card here would do wounders ! (did I spell that wright?)
> Although I think LDraw and LDLite do not model this effect, some other
> program might. POVRay does, right? But it doesn't benefit from clipping
> unless you have reflection turned off.
Agreeing again!
Rui Martins
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Message is in Reply To:
 | | Re: Clipping / CCW / CW / INVERT
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| (...) I believe this is incorrect, no? ALL transparent surfaces should appear, if only to make a contribution to the color that underlying surfaces appear to be (consider a trans blue surface in front of a trans yellow in front of a white... ) (...) (25 years ago, 7-Oct-99, to lugnet.cad.dev)
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