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Newbie
Group: PB Employees
Last Login: Friday, June 12, 2009 9:11 PM
Posts: 20,
Visits: 462
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| Ok, here is a strange one. I found that a MSO material 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: 
And here is the same scene rendered in Max 9 Vray 1.5rc4: 
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. So to fix this problem my solutions are: model the logo and apply a chrome mat. or detach the polys and apply the material with the opacity map as a separate material outside the MSO. This took lots of trouble shooting to isolate (Thanks Mark!!). Hope this gets fixed in next Vray release.
Randy Burton
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Design Visualization Specialist
Project Visualization Technical Resource Center
P: 303-390-5902
F: 303-390-5934
burtonr@pbworld.com
www.pbprojectviz.com
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Newbie
Group: PB Employees
Last Login: Friday, June 12, 2009 9:11 PM
Posts: 20,
Visits: 462
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| Ok, I posted the problem on Chaosgroup and found the workaround. You have to take your glass (or highly refractive) material in your MSO and turn it into a VrayBlend material (keep material as sub-material) with no coat materials (blending with nothing). Somehow this fixes it. Also another thing I found, there is a new checkbox in 1.5 under the Color Mapping drop-down: Sub-pixel mapping: 
When unchecked materials with blurry reflections have undesirable effects.
Randy Burton
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Design Visualization Specialist
Project Visualization Technical Resource Center
P: 303-390-5902
F: 303-390-5934
burtonr@pbworld.com
www.pbprojectviz.com
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Member
Group: PB Employees
Last Login: Wednesday, April 04, 2012 8:47 PM
Posts: 81,
Visits: 1,339
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| It also sounds like the newer RC4 build doesn't have the problem. We might just need Vlado to send over the current build (the last rc4 I saw that we had was dated 2/16) SteveJ
Steve JohnsonPBProject Visualization Technical Resource CenterE-Mail: johnsonste@pbworld.com...................................................................................................
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