Dan Connelly wrote:
> stbenge wrote:
>> You cannot give an object a variable index of refraction, sorry. But 
>> you *can* stack many transparent objects onto each other, each having 
>> a different ior. It might work for the mirage effect. The render times 
>> using this method are slooow, even on faster computers.
> 
> I've found when stacking translucent objects with internal media, I need 
> to be REALLY careful about separating surfaces, or I get spotty artifacts.

Oh no, with media in the equation, the scene might take months to 
render! I don't think media is really needed for this effect.

Oh yeah, the poster may want to give the stacked objects no_shadow to 
help speed things up somewhat.

Sam

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