Maxime Marrow nous apporta ses lumieres en ce 2008/03/23 18:13:
> Alain wrote:
>> Maxime Marrow nous apporta ses lumieres en ce 2008/03/23 10:32:
>>> Consider the following POV-Ray code:
>>>
>>> #include "functions.inc"
>>>
>>> background{1}
>>>
>>> camera {
>>>    location  1.5
>>>    look_at   0
>>> }
>>>
>>> isosurface{
>>>  function { f_noise3d(3*x, 3*y, 3*z) - 1/2 }
>>>
>>>  max_gradient 4
>>>
>>>  hollow
>>>  pigment { rgbf 1 }
>>>
>>>  interior{
>>>   media{
>>>    intervals 100
>>>    absorption 1
>>>   }
>>>  }
>>> }
>>>
>>> What is the reason for the black spots and is there a way to avoid them?
>>>
>>> Thank you,
>>> Maxime
>> Apart from the obvious isue with max_trace_level.
> 
> Thanks to you and Warp for the max_trace_level suggestion. I changed the 
> value to 20 and this removed almost all artefacts. Is there way to 
> remove the remaining artefacts?
> 
>> You may need to add "all_intersections" to your isosurface. Without 
>> that, you will miss most surfaces after the first one encountered.
> 
> Doesn’t this apply only to isosurfaces which are used in CSG operations?
> If no, can you give an example (not involving CSG) where the omission of 
> all_intersections results in omission of surfaces?
>
Anytime you have transparency.

-- 
Alain
-------------------------------------------------
   My wife is such a bad cook, if we leave dental floss in the Kitchen the 
roaches hang themselves.
	Rodney Dangerfield

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