Stefaan De Roeck nous apporta ses lumieres en ce 2008/04/07 12:43:
> Hi!
> 
> In the povray-code posted below, I'm trying to show two objects composed 
> of transparent light emitting material, that intersect eachother, simply 
> as an illustration of what the intersection should look like (first 
> object red, second green, in the intersection both colors are emitted 
> simultaneously).
> 
> This seems to work great, except when the surfaces of both objects come 
> close to eachother.  Rendering the code should show some sort of cross 
> composed of areas/pixels that are either fully red or green.  It is as 
> if the rays only see the entrance into one of both objects, and the 
> other object is disregarded.  Rendering with anti-aliasing partly hides 
> the problems where they weren't too large in the first place, but the 
> cross is still very visible.
> 
> Is there an easy solution for this?  (I suppose it's an accuracy 
> problem, not a real bug)
> 
> Many thanks,
> Stefaan
>
Problems with floating point rounding errors.
An easy solution:
Scale your scene by 100 and divide the density by 100 and the cross is almost 
gone. Increase that to 1000 and you no longer see the artefacts.

A question: Why use a lathe when you have the cone primitive?

-- 
Alain
-------------------------------------------------
WARNING: The consumption of alcohol may make you think you are whispering when 
you are not.

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