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Thread: Why is my Mental Ray Fog so Dark?

  1. #1
    Member kirstenzirngibl's Avatar
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    Aug 2014
    San Diego

    Kirsten Zirngibl
    Forum Username

    United States

    Default Why is my Mental Ray Fog so Dark?


    I'm finally trying out the "fog" atmosphere effect in Mental Ray and can't figure out why a white fog looks 50% grey in my scene.

    Light: MR Sun (part of Daylight system)
    Environment Map: mr Physical Sky
    Atmosphere effect: Fog (regular)
    Logarithmic Exposure Control: Active
    Fog Parameters:
    - Color set to WHITE
    No color map or opacity map
    "Exponential" box unchecked.

    Here is a WIP scene:


    Any insights? Thanks.
    Last edited by kirstenzirngibl; July 28th, 2017 at 02:22 PM.

  2. #2
    Veteran Member
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    Jan 2007

    Francisco Penaloza
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    United States

    Default Re: Why is my Mental Ray Fog so Dark?

    Not in my machine now, but if you want to create distant fog with Mental Ray I would recommend to give a try to aerial perspective. This work much better for that type of effect.
    Also maybe your problem is the exponential exposure, try to use MRay exposure or photographic exposure instead.
    Exponential will clamp brightness and may be creating that effect on your fog.
    "It is good to renew one's wonder"

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