Am 28.08.2010 20:17, schrieb Stephen:


> It is not a big scene but all of the elements are required for it to
> fail. It also seems to be dependent on the camera angle.

The root cause is a combination of

(1) a problem with either the sor or lathe object, returning "undefined" 
as the surface normal at a certain point (which leads to "undefined" 
values in subsequent computations of a refracted ray), and

(2) a lack of defensive programming in the image handling code (which 
"converts" the undefined values into an access violation).

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