IOR

[rauland]

Hello!

If IOR goes from 1 to 3, 1.5 will be a 50% gray in color?
I want to plug a Multimap to the glass material in order to have some variation on a curtain wall.

Thank you!

[maru]

If you want to drive IOR by a texture/color, then pure 255 white with a multiplier of 1.3 will be interpreted as IOR 1.3.
If you use values lower than 1, then the value is interpreted as 1/value. So for example a value of 0.5 will result in 1/0.5=2.
Ergo, a value of 2 will give you the same result as a value of 0.5.

[rauland]

For glass, multiply the output by 1.5 right?

[maru]

If you would like the IOR to be 1.5 then use a white Corona Color map and set the multiplier to 1.5, yes.