Reverse IOR (bubbles underwater)

[Anonymous]

Hi everyone! How can I invert the ior value in Arnold? I have try to put a negative values like -1.3, but the shader don't accept that. In some case I just invert the normal of the geometry and works fine, but in another cases that's not possible like when I try to work with nparticles. Someone can help me on that?

[zenop]

There's no need to put negative values, as 1 is your middle point. Use the 0-1 range instead 🙂

Specifically, for underwater air bubbles, use 0.75 (1.0/1.33)

[Anonymous]

Hi Zeno, thanks for the answer. I already have tried that buts the result wasn’t work. The bubbles became flattening.

[lee_griggs]

There is a bubble example here.