When a grayscale map is assigned to vraymtl's refraction IOR slot, what happens?

V-Ray V-Ray for 3ds Max General
1

When a grayscale map is assigned to vraymtl’s refraction IOR slot, what will happen?

What should I do if I want the black area to have IOR = 1, white area IOR = 2? I tried to change the IOR when there’s a map, the IOR value seems to be ignored.

I checked the chaos documentation. It’s not mentioned there.

I did a test with VrayColor. When the map’s gray value varies from 0-255, the IOR varies between 0-1. So how do I use a map to bring an IOR to above 1? Thanks again.

I also checked lots of info. No materials have IOR between 0-1. Most things have IOR between 1-2.x. Since then, what’s the purpose of having this texture slot for IOR, if it can only be set to 0-1?

Any help will be much appreciated.

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Any help, please?

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You could take a VrayCompTex node and set Operator ‘Multiply (A*B)’ and connect your bitmap and a new VrayColor node with red=green =blue =1.0 , RGB multiplier= 1.6 (for glass IOR).

or you cound set ior map’s Output Amount value to 1.6 , it works too. but I perfer the first way .

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Use the Output rollout Enable Color Map and set the min and max values to the desired range. (Which can be greater than 1.0 as required here. )

5

Thank you, that’s such a great idea!!!