> Hello,
>
> I have a problem with transparency while rendering. To make it simple I've made
> an example to explain it. The scene consists of 3 cubes of different size,
> placed one in another. The problem here is that if I put all the transmit
> parameter to 1 with a white background; we should see only a completely white
> picture. Here it's not the case, the last cube (the smallest and the one
> surrounded by the 2 others) appears black. I don't know if a parameter is
> missing in my code,... Here is the code:
>

3 nested objects means 6 surfaces to compute plus 1 for the background. 
This makes 7 points.
max_trace_level default to 5, so you stop tracing at the 5th surface and 
return black.
Outer box is 2 surfaces plus 1 or 3.
Second box add 2 surfaces for a total of 5, or the default value of 
max_trace_level.
Third box adds 2 more abd gives black.

Solution:
Set max_trace_level to a value large enough to go through all surfaces, 
in your case, that's 7 or larger.
As you have non-zero reflection, there is no other solution.



Alain

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