I attached the video When mud wraps around the wheels it explodes in bursts. I got 20 sub steps and 6 iterations Adhesion 0.8 Cohesion 0,2 Viscosity 0.05 Resolution is set to 50 Am i doing something wrong? mud puddle is around 3 meters in diameter Are there any best setting for mud that flies up and still gets stuck Thank you |
| And one more questions what should be bigger Sub-steps or iterations, What is the best ratio? What excatly means iterations? it says number of solver iterations but it is kind of confusing Also if you look at the white truck frame and mud that is stuck, mud is not 100% stationary it is jittering. Not sure how if once particles are stuck how to make them 100% stationary Thank you! |
| The exploding from the video looks strange indeed. Do you think you can recreate the exploding problem in a smaller scene that we can debug? Sub-steps are internal inside the physics solver, they are designed to prevent things like particles tunneling through collision geometry. Iterations are done outside of solver, they just break every frame into X number of sub-frames, these are done more for stability. Marsel Khadiyev (Software Developer, EPHERE Inc.) |
| Yes I will send it shortly. Do you have madcar 3 plugin by chance. That's what we are using to simulate a car. Then we add proxy cilinders for wheels and boxes for a car frame and then we do simulation of mud If you dont have madcar 3 I will try to just animate cylinders as wheels turning |
| Please try animating it. We try to avoid any 3rd party plugins in tests like these (removes complexity). Marsel Khadiyev (Software Developer, EPHERE Inc.) |
| Hi Marsel Unfortunatly we have to use madcar. But it is like animating mesh. Car dummy is animated and mesh is just linked to a moving dummy car. So it is similar to dummy moving around with mesh attached to it. I attached couple of scenes |
| this one is without madcar and was just animated using keyframes but explosions still happen. Wheels get coasted with mud and for no reason mud just explodes. This max file has a slight gap between wheel and actual surface (so there are particles between tire and surface) and it did improve a little By the way do Dyn Friction, Stat Friction, drag, lift, damping apply to liquids? Not sure exactly which flex option are for liquids only. If not would be nice in the future to have little icons next to them like a drop of water, a piece of cloth so you know which flex settings are for cloth, for liquids etc. But particles of dirt that are attached to truck still jitter a lot no matter what we did. Thank you |
| Thank you for the scenes, we will investigate. Marsel Khadiyev (Software Developer, EPHERE Inc.) |
| Changing substep count to 4 and iteration count to 3 fixes the problem.
The problem can be also fixed by setting maximum speed manually, check the Flex Settings helper for this. Value of 100 seems to be fine. Marsel Khadiyev (Software Developer, EPHERE Inc.) |
| thank you! So more substeps does not mean better? I had around 60 substeps I guess it is overkill |
| Yes, not always. More substeps can make things too rigid which I guess can add to instability. Max. particle velocity is good for controlling stability, essentially you're creating a global speed limit. Marsel Khadiyev (Software Developer, EPHERE Inc.) |
| Nice to know this. Thank you! |
