But then there is no need to have high max_trace_level at all, this can 
lead to faster rendering of other parts of the scene.

I don't know POV internal structure well, but probably you are right, 
POV must first determine, if the ray intersects that polygon and then 
look, if the polygon is transparent at the intersection point or not. 
But all overhead caused by need of shooting new ray is removed (I don't 
know, how much it is, can be saved some work with etc bounding??).

V.

Tek wrote:
> Speaking from a technical point of view I don't think it's possible. It's a 
> good idea but pov can only check the mask for a polygon after computing a 
> ray intersection with that polygon, meaning it's doing exactly the same 
> amount of work as just having a high max_trace_level.
>

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