CRIS wrote:

> Rather about my second question, maybe I explained bad, if i put in the
> spotlight source : 'color Red * 1' i don't see the light on the internal bars
> but if i put (for example) 'color Red * 200'  i see the red line on the internal
> bars.

your light source, bars and projection object all end on x = 0,
this coincidence is likely to get you into numerical issues. Also,
at a grazing angle diffuse illumination is close to 0 but becomes
visible if you boost the light power by 200.

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