"Warren" <nomail@nomail> wrote:

> Here the author of this page says that if two materials (here, the mint syrup
> and the glass) have some surfaces in common there will be black, gray or white
> stains that will appear, the solution there is to apply a scale with the value
> of 0.99 , 0.999 or something like that, to separate the materials.

That would be the infamous "coincident surfaces" problem - but I doubt that
applies here.

There may be some other strange thing going on, but of course, without code, or
a detailed look at the rest of the scene - it's hard to know.

I'd isolate the bathtub and the light source in a separate [include] file and
render it in an animation with the camera looking at the tub, and going around
it in a circle.

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