DJ Wiza nous apporta ses lumieres en ce 05/04/2006 04:33:
> Originally, I had created what I called "naked primitives" by using 
> cylinder elements in blobs to create sort of a wire frame of a cube, 
> pyramid, and a sphere, with some radiosity for effect.  The blobbing 
> created a bit more mass at the vertices, which was the effect I was 
> going for.  Then, I noticed that the sphere didn't much resemble a 
> sphere, but rather this odd shape that looked kind of cool.
> 
> Then I decided to take the sphere-like shape on its own, make an array 
> of them, make every other one reflective, put it over a checkered plane, 
> and add some focal blur.  And this is the result.
> 
> I don't like it though...the focal blur isn't quite right.  The settings 
> I used were 200 samples, confidence 0.99, variance 1/100000, aperture 4, 
> with the focal point in the very center of the sphere.  The problem is 
> that the focal blur still looks grainy, and there are couple black 
> pixels.  I'm assuming the black pixels are from the max_trace_level 
> being reached.  I'm using the default.
> 
> What also gets me is some of the edges in the checker pattern are abrupt 
> in the focal blur.  What would cause that?
> 
> ------------------------------------------------------------------------
> 
You may try with a lower aperture value, like in the 1~2 range. Smaler aperture should
make the 
grainyness less apparent, or you can increase the sample number, along with the render
time.
You probably need to increase Max_trace_level, and maybe use a larger adc_bailout.
For the black leaking on the white, you may try using Gray05, Gray10 or Gray15 for the
dark squares. 
Don't know if it will help.

-- 
Alain
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