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Thread: Speeding up a scene with a LOT of volumetric lights...

  1. #1
    May the sauce be with you starbase1's Avatar
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    Speeding up a scene with a LOT of volumetric lights...

    Hello All,
    I'm working on a scene for a Lunar orbital outpost, and the customer wants lots of atmospheric volumetric lights.
    (LW 11.6)

    I'm going for sprite quality lights, (not too awful so far)
    2/4 adaptive AA
    No global illumination
    1 shading sample, 1 light sample
    Polygon count is about 600k


    The render times are getting painful, and the image quality is not good enough either... Sample still attachedClick image for larger version. 

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    Is it just a case of being patient?

    I have a suspicion that the overlapping of some of those volumetric lights is a big part of the problem, but trying to find an arrangement that minimises that won't be easy.

    Any suggestions for things to try?
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  2. #2
    Goes bump in the night RebelHill's Avatar
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    Your customer does realise there's no volumetric medium in space, right?

    Anyhow, cant think of a great deal you can do... if the speed hit is coming from having the vol lights in the scene (and the speed is ok without), then only thing I can suggest is to use geo cones instead, with graduated transparency and luminosity based on incidence to view. For shots such as you show, that can work out ok... it only turns to useless if your camera has to pass through/inside the volume.
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  3. #3
    May the sauce be with you starbase1's Avatar
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    He's ex NASA, he realises! But he also used to be in the Navy, and likes the way it looks like night on a boat...

    I'll have a think about your approach, thank you.
    Faith is the opposite of Intelligence.

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  4. #4
    RETROGRADER prometheus's Avatar
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    Quote Originally Posted by RebelHill View Post
    Your customer does realise there's no volumetric medium in space, right?

    Anyhow, cant think of a great deal you can do... if the speed hit is coming from having the vol lights in the scene (and the speed is ok without), then only thing I can suggest is to use geo cones instead, with graduated transparency and luminosity based on incidence to view. For shots such as you show, that can work out ok... it only turns to useless if your camera has to pass through/inside the volume.
    There´s tons of volumetric medium in space, gases nebulas etc...If you look at the big picture

  5. #5
    RETROGRADER prometheus's Avatar
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    Quote Originally Posted by starbase1 View Post

    Any suggestions for things to try?
    Go for lowest acceptable quality in the volumetric light.

    go to Effects/volumetrics tab, turn off volumetric Antialiasing.
    Turn off opacity casts shadows.

    Get a better pc.

  6. #6
    Goes bump in the night RebelHill's Avatar
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    Quote Originally Posted by starbase1 View Post
    boat
    ship.
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