Vaclav Cermak nous apporta ses lumieres en ce 28/10/2006 07:03:

> 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.

In that case, you can use adc_bailout with a slightly smaller value than the 
default (about 1/256).
That way, you don't always go to the max_trace_level. Also, if there is no 
reflection nor refraction, or only refraction or only reflection, you stay with 
only one ray, meaning minimal slowdown.

-- 
Alain
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If you choke a Smurf, what colour does he go!

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