Am 01.04.2012 15:53, schrieb Christian Froeschlin:
> Christian Froeschlin wrote:
>
>> I moved the mirror and light and get a rectangle on the
>> disc that is the reflected image of the box.
>
> although I have to confess I don't quite understand the effect.
> I found the light was actually from multiple refractions / reflections.
> With an opaque pigment I no longer get any light until the angle gets
> well below 45 degrees or so.

You're probably using RC4 or RC5 as well, so what you see is the result 
of the bug I just mentioned. It seems that it doesn't harm total 
internal reflection though, which may be the reason that you still see 
any reflections at all with the transparent pigment.

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