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Mash distribute and UVW randomiser issue

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  • Mash distribute and UVW randomiser issue

    Ive been using uvw random node to fix tiling quixel shaders, and then I blend those together using various other maps. It all works well until I try to scatter geo into the mix using MASH. My example is a rocky base shader in a blend, with a strong displacement. A sandy texture above that, and blending the two so the sand is filling the lower pockets of the rock. Each shader has a UVW random driving it, so there is no tiling. Works so far....

    Then I want to scatter geo to my scene, and only on the sand. This works fine, if Im not using the UVW randomiser. I cant get any grass to apply to the parts I want unless I remove the UVW random from all the shaders and maps. Is this a known issue, or am I doing something wrong? In MASH Im driving the scattering placement by using the same blend map (result in rocks up high, sand in crevasses) to drive the visibilty strength map. Like I said, it all works if I remove the UVW random, but then everything tiles.

    Im using Vray 5.2 and Maya 2022.4
    Website
    https://mangobeard.com/
    Behance
    https://www.behance.net/seandunderdale

  • #2
    Another question would be, if I have some pretty heavy displacement on some ground geo...can that displaced geo be used correctly as a mesh to scatter onto using MASH? Seems MASH is pretty useless for complex natural ground if you cant scatter onto displaced geo.
    Website
    https://mangobeard.com/
    Behance
    https://www.behance.net/seandunderdale

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    • #3
      Any idea if this is something that can be done? Just to reiterate my point...is the result of the UVW random texture able to be used as an input into other stuff? So far I cant seem to get the result of the UVW random to drive anything.
      Website
      https://mangobeard.com/
      Behance
      https://www.behance.net/seandunderdale

      Comment


      • #4
        Hi, thanks for posting and please excuse us for the delayed reply.

        Then I want to scatter geo to my scene, and only on the sand.
        What do you use to accomplish that (a texture probably)?

        displaced geo be used correctly as a mesh to scatter onto using MASH?
        Is it working in you case? I will have to build a test scene and test all of this. If you could send us a test scene that you probably have this will be of great help.
        Please use the support contact form for that.
        Vladimir Krastev | chaos.com
        Chaos Support Representative | contact us

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