Bob Hughes wrote:
> 
> Just a thought... any chance there could be coincident surfaces?  Maybe a zoomed
> in view of one of the "wrong" places might show random pixelization if so,
> although the textures might need to be more colorful to show that.

Well that's not really the problem. Although the surfaces overlap, the
raindrops surface passes sort of in and out--they shouldn't match up in
both position and surface normal at any point.
The problem is that rays are passing through one of the objects where
they shouldn't. There's no real explanation for it.

Lummox JR

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