Gunnar wrote:

> giving me a light magenta torus.
> Then I intersected the torus with 2 other rotated tori. Where only 2 tori
> intersect the result is good: a somewhat deeper magenta. As soon as 3 or
> more tori intersect this area becomes black while it should be just even
> deeper magenta.

Do you get any warnings during parsing or rendering? You need to
increase max_trace_level when intersecting multiple transparent
objects, and some media sampling related parameters might need
tweaking as well.

Depending on what you want to achieve, you can also try to
use filtering pigments (rgbf) instead of media.

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