William F Pokorny <ano### [at] anonymousorg> wrote:
> On 11/3/23 18:25, Mike Miller wrote:
> > my scene is enclosed/surrounded with a mapped sphere object. I did try Alain's
> > idea....same results. I added depth to the billboards but it renders both front
> > and back resulting in a double image. Is there backface culling in POV? ...don't
> > see it in the help files. I'll try a clipped plane just to test.
>
> There is interior_texture{}.
>
> I think you could make the normal texture{} completely transparent and
> the interior_texture{} your image map. It should be the first
> intersection on the billboard uses the exterior texture{} and the second
> interior_texture{}.
>
> Aside: By default texture{} gets used for the interior texture of shapes
> too - if you only specify a texture{}.
>
> Bill P.

I found the problem. It turns out that if add even a small amount of turbulence
(.3 or more) to the fog definition - it tints the alpha portion of the image
map. I set the turbulence to zero and it cleared it up. I'm not sure why, but it
worked.
Mike.

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