[Radiance-general] Slow rendering with transparant textures

[iebele]

Hi Greg, 
Ok, thanks. Good to know that this model indeed gets close too the limits. 
Makes it a lot easier to have a few more days patience with it.
Iebele

> Hi Iebele,
> 
> One of the slowest things in Radiance is the .cal file evaluations,  
> so minimizing expression evaluations is the key to faster renderings  
> in this case.  Having many surfaces for each ray, all having function  
> evaluations, is bound to be slow.  Combining or eliminating such  
> calls would help a lot.  I don't know enough about your situation to  
> recommend "how."
> 
> -Greg
> 
>> From: "iebele" <info at iebele.nl>
>> Date: July 27, 2008 11:27:29 PM BDT
>>
>> Hi all,
>>
>> I have a model with about 40.000 polygons, each textured with a  
>> mostly transparant image (only about 1% of the texture is visable).  
>> Seen from the rendering viewpoint the polygons in the model overlap  
>> quite a lot, so one ray might have to "look" through about 50  
>> "transparant" polygons or even more before actually "see"  
>> something. I think this is why this particular model renders  
>> amazingly slow, even with -ab set to 0, -st 0 and -lr 1. Is there  
>> another parameter in control that might speed up the rendering in  
>> such case?
>>
>> -Iebele
> 
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