I found that a MSO material in Vray 1.5 that contains a material with an opacity map causes unwanted effects to materials with refraction in that MSO (namely glass). Here is a render straight out of Max 8 Vray 1.47:
http://i5.photobucket.com/albums/y15.../Max8Vray1.jpg
And here is the exact same scene rendered in Max 9 Vray 1.5
http://i5.photobucket.com/albums/y15.../Max9Vray1.jpg
The body of the car is one MSO with 13 material/IDs, the last of which is for the Honda logo and contains an opacity map. As you can see, the refraction in the glass is incorrect in this render. When I clear the opacity map from the Honda logo, the glass is fixed. The glass has a thickness of 1/8" and the material has real world IOR and is correct. The MSO always worked fine in 1.47. It is not a corrupted material, same results when I put any glass material in a MSO with a material containing an opacity map
http://i5.photobucket.com/albums/y15.../Max8Vray1.jpg
And here is the exact same scene rendered in Max 9 Vray 1.5
http://i5.photobucket.com/albums/y15.../Max9Vray1.jpg
The body of the car is one MSO with 13 material/IDs, the last of which is for the Honda logo and contains an opacity map. As you can see, the refraction in the glass is incorrect in this render. When I clear the opacity map from the Honda logo, the glass is fixed. The glass has a thickness of 1/8" and the material has real world IOR and is correct. The MSO always worked fine in 1.47. It is not a corrupted material, same results when I put any glass material in a MSO with a material containing an opacity map
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