Hello,
media { density {} } allows a 3D distribution of absorbace. This will change
each ray intensity. Is it possible to have a 3D distribution of the refractive
index? This would allow the bending of each ray _inside_ the material. At the
moment, in povray, bending of rays is possible only on the surface, through the
real geometry of the object or through the normal {} command.

An example of the possible effects of ior 3D patterns is the "Fata Morgana" (
https://en.wikipedia.org/wiki/Fata_Morgana_(mirage) ) and other atmospheric
effects. Also ancient or low quality real glasses show this effect. GRIN lenses
are another example.

How would you produce a non-uniform distribution of the refractive index, in the
absence of a interior {ior density {}} command?

Thanks
igmar

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