Tim Attwood wrote:
> The bug is in the quartic, it appears
> not to work predicably with radiosity
> (even if you bound it).

The bug remains if the quartic is replaced with isosurface:

  isosurface{
   function { x*x + z*z - 1/4 }
   contained_by { box{ <-1, -5, -1>, <1, 5, 1> } }
   max_gradient 8
  }

> The easy solution is just to replace it
> with a long cylinder... 

This will not fix the bug.
I have a scene with isosurface (which can not be replaced), in which the 
rendering freezes during a radiosity pre-trace pass.

William

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