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Thread: Volumetric Distance

  1. #1
    Curmudgeon in Training Ma3rk's Avatar
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    Volumetric Distance

    https://docs.lightwave3d.com/lw2019/...etric-distance

    The Volumetric Distance setting, new to 2019, is the distance the volumetric effect reaches from the ray.

    Might there be an example or English translation of what this is?
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  2. #2
    RETROGRADER prometheus's Avatar
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    Quote Originally Posted by Ma3rk View Post
    https://docs.lightwave3d.com/lw2019/...etric-distance

    The Volumetric Distance setting, new to 2019, is the distance the volumetric effect reaches from the ray.

    Might there be an example or English translation of what this is?
    Bad documenting.

    I donīt understand it fully yet, though you need to set the " right distance " in order to have objects cast ray shadows, or have volumetric clouds cast godrays..difficult to set right.
    Too high value distance and the ray shadow effect is gone, and too low distance..and it wonīt show either.

    This thread doesnīt belong here though, should be in Lightwave forums/general support.

  3. #3
    RETROGRADER prometheus's Avatar
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    As I understand it, if you have something near camera ..a building or a landscape, if you set volumetric distance to a couple of thousands of meters, you wonīt see a thing happening near the camera, it is sort of like the old hypervoxels volumetric clip distance I think, but in reverse as I recall it.
    if you have a cliff maybe 100x 100x 60 meters, you can not set a volumetric distance of 500 (I think) bu you need to set it to maybe 50 meters so the volumetric rays isnīt cut off before it hits the cliff ..and to ensure the volumetric distance isnīt cut off after, seems to be camera related.

  4. #4
    Curmudgeon in Training Ma3rk's Avatar
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    For now I'm leaving at the default of 1 meter.

    Maybe BeeVee will see this & add it to the to do list.
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  5. #5
    LightWave documentation BeeVee's Avatar
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    Sounds like it'll be hard to document more accurately too

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  6. #6
    Curmudgeon in Training Ma3rk's Avatar
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    Quote Originally Posted by BeeVee View Post
    Sounds like it'll be hard to document more accurately too

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    Maybe some render samples demonstrating. Ya know that old 1 pix = 1K verbage thaing.
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    RETROGRADER prometheus's Avatar
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    Quote Originally Posted by Ma3rk View Post
    Maybe some render samples demonstrating. Ya know that old 1 pix = 1K verbage thaing.
    Better yet, provide a few sample scenes illustrating various setting..if it is of such importance.

  8. #8
    Not so newbie member lardbros's Avatar
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    I had a play with that setting earlier today, and couldn't figure it out for the life of me
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  9. #9
    RETROGRADER prometheus's Avatar
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    Quote Originally Posted by lardbros View Post
    I had a play with that setting earlier today, and couldn't figure it out for the life of me
    It shouldnīt be hard to set up various objects with various distance with the same volumetric distance applied to showcase those relations, and then same objects in other scenes with some different volumetric distance that can cast rays good enough, and then set up the main Global volumetric scattering, how you set up the global volumetric assymetry matters a lot as well, light size within the new suntype also matters.

    Personally I may try to stay away from 3D experimenting 4-5 days ahead, so I donīt think I will get the time until after that.

  10. #10
    Super Member kolby's Avatar
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    Maybe I'm completely wrong, but since the Volumetric Distance parameter is only available for distant lights which has a constant intensity without any falloff, no matter how far from the camera they are, It seems to me that the volumetric distance simply defines how far from the camera the distant light source "really" is, to provide proper effect or at which distance from the camera the volumetric effect starts.
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  11. #11
    RETROGRADER prometheus's Avatar
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    Quote Originally Posted by kolby View Post
    Maybe I'm completely wrong, but since the Volumetric Distance parameter is only available for distant lights which has a constant intensity without any falloff, no matter how far from the camera they are, It seems to me that the volumetric distance simply defines how far from the camera the distant light source "really" is, to provide proper effect or at which distance from the camera the volumetric effect starts.
    Correction, the volumetric distance is not only for distant lights, it is for the new sunlight, it is there for environment lights.
    will take a look in to the other stuff later.

  12. #12
    Curmudgeon in Training Ma3rk's Avatar
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    Well, someone holler when you figure it out.

    My guess though is that you'ze guy's will end up doing all sorts of tests, end up with an image or two that demonstrates what the effect actually does, and THAT'S what'll end up in the Wiki.
    "Never be a cat in a cartoon. Never." Chief Wiggum

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