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From: Nathan Kopp
Subject: Re: error: Cannot layer over a patterned texture.
Date: 28 Nov 1999 23:58:30
Message: <384207f6@news.povray.org>
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Ron Parker <ron### [at] povray org> wrote...
> By the way, one side-effect of this is that POV seems to trace too many
rays
> for some scenes. The following scene traces three rays per pixel (one eye
> ray plus one transmitted ray for each of the plain textures in the
> interpolation.) I suppose you could call that a bug.
Not totally a bug. If each layer has a different normal & the interior has
an IOR, you'd want it to use different rays. An optimization would be to
re-use the result from a refraction or reflection if the previous layer
already shot it.
-Nathan
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From: Nathan Kopp
Subject: Re: error: Cannot layer over a patterned texture.
Date: 28 Nov 1999 23:59:41
Message: <3842083d@news.povray.org>
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Chris Huff <chr### [at] yahoocom> wrote...
> I have run into this problem before, I don't see why this limitation
> exists. Maybe another project for me to work on. :-)
I have looked at it and (for reasons that Ron Parker mentioned) it is not an
easy fix. If you find out an easy way, please let me know.
-Nathan
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From: Ron Parker
Subject: Re: error: Cannot layer over a patterned texture.
Date: 29 Nov 1999 08:56:37
Message: <38428615@news.povray.org>
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On Mon, 29 Nov 1999 00:01:10 -0500, Nathan Kopp wrote:
>
>Ron Parker <ron### [at] povrayorg> wrote...
>> By the way, one side-effect of this is that POV seems to trace too many
>rays
>> for some scenes. The following scene traces three rays per pixel (one eye
>> ray plus one transmitted ray for each of the plain textures in the
>> interpolation.) I suppose you could call that a bug.
>
>Not totally a bug. If each layer has a different normal & the interior has
>an IOR, you'd want it to use different rays. An optimization would be to
>re-use the result from a refraction or reflection if the previous layer
>already shot it.
Would you want it to? Or would you average the normals as you would with a
normal_map? That is, should a texture_map of two different normals have
the same result as a normal_map of the same two normals, or should it be as
it is now? (This is the second example in the post you replied to.)
--
These are my opinions. I do NOT speak for the POV-Team.
The superpatch: http://www2.fwi.com/~parkerr/superpatch/
My other stuff: http://www2.fwi.com/~parkerr/traces.html
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