IOR of sports car?

[EricChadwick]

No refraction going on there, only reflection. Well, at least the refraction would be next to nothing since there is a thin gloss coat on the paint.

BTW, a couple IOR tables...

Organized by index:
http://hyperphysics.phy-astr.gsu.edu/hbase/tables/indrf.html

Organized by material:
http://www.is.kiruna.se/~cjo/d2i/REFRACTION.INDEX3.html

[CapnPanic]

No refraction going on there, only reflection. Well, at least the refraction would be next to nothing since there is a thin gloss coat on the paint.

IOR is also used for fresnel reflections, although i _think_ it's called the complex index of refraction when used for reflections...although i might be mistaken there.

while i don't know that you'll get a definitive answer to your original question, i suggest something around 2.0-2.3 for car paint, at least nice clean, new car paint.

maybe around 1.2-1.4 for the rubber, assuming you were going to use glossy reflections, lower (maybe 1.1-1.2) if you wern't.

and i'm not sure what your spokes are made of on your wheels. if they were chrome or gold spokes (bling!) then something high would work, like 15.

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