feestje wrote:
> hi all,
> 
> I want to make an animation about the so-called "mirage effect" on a heated
> surface with a sphere present. (what is the mirage effect:
> http://www.physlink.com/Education/askExperts/ae428.cfm)
> 
> Basicly the effect is created by a difference in refractive indix of a hot and a
> cold medium (water). Is it possible in PORAY to create a location dependant
> refractive index?
> 
> Regards, Ruud

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.

Or you could try modeling a microsphere atmosphere, but this would 
render even more slowly, I'm pretty sure.

Sam

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