refraction ior will be ignored if Opacity is set other than 1.0.

[flat]

With VRayMtl of Maya,
Refraction IOR will be ignored if Opacity is set other than 1.0.
(latest maya2014 win Nightlies is used.)



test scene
opacity.zip

At VRayBRDFPlugin, it is No Problem.

Please Check.

[vlado]

Yep. When you use opacity, the V-Ray material always assumes IOR of 1.0. Using refraction together with opacity doesn't make sense at all. However if you still need this for whatever reason, you can put the refractive material as a coat material inside a VRayBlendMtl material, leave the base material empty, and use the blend amount as a transparency mask.

Best regards,
Vlado

[flat]

OK.
I memorize as a theory in maya.

Thank you for advice.