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What happens when I scale a simulator?

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  • What happens when I scale a simulator?

    When I have a simulation, just need it to be bigger in the scene:
    I saw I can scale the simulator

    And (I'm guessing here) when I resimulate, it will be the same result.
    Is that right?
    Can I scale simulators like other objects in the scene (knowing, that this will of course not increase the resolution because I'm scaling the voxels)

    Thanks

  • #2
    I don't know if this is correct way, but in my current project I have four instances of same simulation with each scaled differently. As always, I run the simulation by using a dummy geometry on separate scene. That way each render render simulators are updated correctly. Then I just activate the entry in my backburner queue to see the update in rendered animation as well.

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    • #3
      Nope, don't scale Simulators if you intend to run their simulation. You can scale them if you will only render them, but simulation will likely break if a Simulator is not at 100% scale. You can rotate Simulators though

      Cheers!
      Svetlin Nikolov, Ex Phoenix team lead

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      • #4
        Svetlin,

        Further to this message I have just started using Phoenix and have used some of your fountain and waterfall simulation example scenes, these are done in units CM, how do I bring these into my scene which is set to units M ?

        Any ideas or do I have to run them again under Meters? As far as I see if you use Max's converting units from CM to M it doesn't work.

        Many thanks,

        Jason
        AMD Threadripper 3990x 64C Processor, 128 GB DDR4-3200 Ram, 48 GB PNY Quadro RTX A6000, ​Windows Pro 10.0.19045.4894, 3dsmax 2025.3, Vray 62006, Vantage 2.5.2​

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        • #5
          Hey,

          So if your scene is in meters, but still the world scale is correct, then the fountain simulator from here (https://docs.chaos.com/display/PHX4MAX/Example+Scenes) which is 90 cm tall should become 0.9m tall and keep working correctly, if you do the following:
          - Merge the fountain scene into your scene.
          - In the Grid rollout, decrease 100 times the X, Y, and Z sizes in voxels - they should read 139, 155 and 90.
          - Further down in the grid rollout, you should do the same with the adaptive limits - they should read 55, 55 for X, 50, 62 for Y and 0, 716 for Z.

          If you have already simulated the original scene and it had created the Particles [...] of [PhoenixFDLiquid] nodes, then delete them from the merged scene or don't merge them at all in the first place, and then pick the Simulator's Liquid particle system from the Particle Shader.

          I think this should be all Cheers!
          Svetlin Nikolov, Ex Phoenix team lead

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