[Radiance-general] gloss and area light source rendering problem

[Gregory J. Ward]

Hi Xian,

Adding to Jack's comments, I think you will see what appears as noise  
no matter what you do.  The minification that happens on multiple  
reflections makes your light source into a dot.  In other words, in  
the reflection of one sphere you see more spheres.  The miniaturized  
image of the light source becomes a microminiaturized reflection in  
the reflected spheres, and micromicrominiaturized in the reflection  
of reflection of other spheres.  These will look like noise to your  
eye, but that's what the real scene would look like, also.

-Greg

> From: Yun-Xian Ho <yunxian.ho at nyu.edu>
> Date: May 22, 2006 4:50:51 AM PDT
>
> Hi All,
>
> I have been having problems rendering a glossy bumpy surface  
> composed of intersecting ellipsoids illuminated under a rectangular  
> light source. The image appears to contain some random point source  
> reflections on the surface in addition to the direct reflection of  
> the area light.
>
> To view the rendered image, see: http://homepages.nyu.edu/~yxh201/ 
> bumpysurftest.jpg.
>
> The bumpy surface is made of the following material:
> void plastic gray_plastic
> 0
> 0
> 5 .2 .2 .2 .1482 0
>
> and a 30x24 flat rectangular light source is defined as:
> void light bright
> 0
> 0
> 3 25 25 25
>
> I use the following parameters to render the scene:
> -ab 2 -aa .08 -ad 1024 -as 512 -av .2 .2 .2 -sj 1 -st .01 -dj 1 - 
> ds .05
>
> Any suggestions to clean up the "noise" in the image? Much thanks...
>
> --xian