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Author Topic: Mental Ray, Exposure and opacity  (Read 2135 times)

jona

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Mental Ray, Exposure and opacity
« on: August 06, 2011, 11:55:40 PM »
I am pretty sure I have solved this before but I can't recall how. When I render FP trees or anything with opacity maps for that latter, against the environment I get pure white instead of the proper opacity maps.. Against geometry it looks fine but when rendering anything where the 2D planes are against the environment I get just pure white..

Any ideas?

Thanks again!

iToo

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Re: Mental Ray, Exposure and opacity
« Reply #1 on: August 07, 2011, 09:35:12 AM »

Are you using fog ? If so, please try enabling the "Fog parameters->Exponential" option.

Carlos Quintero
iToo Software

jona

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Re: Mental Ray, Exposure and opacity
« Reply #2 on: August 07, 2011, 06:16:12 PM »
Not using Fog, But I am using Daylight System with mr_Sun and mr_Sky. As I recall though this happens with MR anytime you have a plane with opacity map against the environment BKG and no geometry..


iToo

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Re: Mental Ray, Exposure and opacity
« Reply #3 on: August 07, 2011, 06:38:09 PM »

At this moment i don't remember a similar issue. Please post a screenshot to see the problem.

Carlos Quintero
iToo Software

jona

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Re: Mental Ray, Exposure and opacity
« Reply #4 on: August 09, 2011, 10:06:35 PM »
I believe it has to do with turning on "Process Background and Environment Maps" in the exposure controls.  Enabling that fixes the opacity problem. D'oh.. I keep forgetting that.