Just for information ..
i was beleiving that they allow Patterned layered texture ..
its just that the layered texture must have transparent pigment rgbt like
.instead of rgb ...
is that right ?




news:web.452e76d1e4e2d417c150d4c10@news.povray.org...
> Just want to pose if this is something that would be possible to implement
> without difficulty and how popular the idea would be.
>
> Quite often I use fresnel reflection for my materials, which requires the
> use of 'ior'.  However, this poses a problem if I want to create a single
> material with different sub-materials. (e.g. checker pattern with chrome
> and plastic tiles).  Each of the sub-materials needs it's own ior value,
> however this is part of the material block so it can't be mapped.  Having
> the ability to map materials would allow this to be done much easier.
>
> I suppose this can be acheived somewhat by changing the  maximum
reflection
> values, but I don't necessarily like altering it from 1, and I don't know
> what it's effect is on fresnel calculations, (maybe I'll have to test this
> out).
>
> I know it could also have odd effects on transparent materials, but this
is
> something that may be a usuable off-shoot as well.
>
> Personally, I think the presence of fresnel reflection makes this a
> worthwhile addition, depending on whether it can be implemented easily or
> not.
>
> Other ways to implement this flexibilty would be with interior mapping
(not
> likely the best alternative) or either being able to move the ior to the
> finish block or adding a separate ior strictly for fresnel in the finish
> block.
>
> As a side note, does anyone (particularly the more veteran POVers or
> developers) know the reason for not allowing patterned textures in layered
> textures?  I've always just accepted it, but over the years, I've never
had
> an explanation why this is the case.
>
> -tgq
>
>
>

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