> I tried to do it but I was not so succesfull. Please, see images with
> notes bellow.

About the first problem, it's clearly a max_trace_level problem. This could
explain the darkening on the propeller center too. In my little propeller
code, I chose the value as 2*number of copies + 1. It's going to be slower,
though. If you have some reflection on the propeller blade, turn it off.

The bump mapping problem looks like a bug but it needs further experimenting
to be sure.

G.

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