Alain wrote:
> In some cases, you can use a layered texture.
> Use a fully transparent uper texture with some transmit or filter, like:
> pigment{rgbf <1, 0.5, 0.1, 1>}
> This will add an orange cast to the underlying pigment.
> You can use a filter or transmit larger than 1 to create some 
> interesting effect.
> You can use a negative filter or transmit. It result in a negative effect.
> 
> 
> Alain

I was hoping this would work since it's almost exactly what I want, but 
I get the error "Cannot layer over a patterned texture", which I assume 
comes from having an image_map.
On to try Christian's method now.

Chris

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