[Bf-committers] Ray option make slow render with scene using only shadow buffer lamps

Stephane SOPPERA stephane.soppera at wanadoo.fr
Fri Dec 23 15:15:15 CET 2005

Alexander Ewering wrote:

> On Wed, 21 Dec 2005, Stephane SOPPERA wrote:
>> Hi,
>> I may be misunderstanding something but with current CVS, when I 
>> render the following scene:
>> http://perso.wanadoo.fr/stephane.soppera/blender/slow_ray.blend
>> If in render panel, "ray" button is pressed render takes 1minutes and 
>> it only takes 10seconds when "ray" is not pushed.
>> This would not be suprising if I was using ray shadows or ray 
>> reflexions or ambiant occlusion, but this simple scene only contains 
>> one spot without shadow and 4 spots with buffer shadow.
> What is happening is that anti-aliasing for textures (also 
> procedurals) is
> done more "elaobrately" if the "Ray" option is switched on, should be
> clearly visible if you compare two renders.

On a more complex scene with textures, I tried with and without ray on, 
and you're right. Aliasing of textures with "hard transitions" is not 
the same if Ray option is on or off.

> Why it is coupled to the "Ray" option I have no idea though :)

Since nobody seem to have a clue, I'll have to invistigate that myself.


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