jkarian Posted February 1, 2019 Share Posted February 1, 2019 Hi there, I have a vellum simmed torus thats producing balls that stick to its surface. I have a second vellum solver thats making the balls interact with the torus' surface and create dents. It all seems to work fine except that there is a significant offset between the balls surface and the torus surface. Any ideas why? Thanks in advance for your help. dentedBooleanVellum3.hipnc Quote Link to comment Share on other sites More sharing options...
mountaingoat Posted February 1, 2019 Share Posted February 1, 2019 Looks like the thickness value isn't accurate? You can view the collision object's thickness in the dopnet. If you don't set your own thickness, I believe it defaults to 0.1 or something like this. Quote Link to comment Share on other sites More sharing options...
devin Posted December 31, 2019 Share Posted December 31, 2019 @jkarian Did you figure this out? Is it just the thickness setting in the constraints? Quote Link to comment Share on other sites More sharing options...
Noobini Posted December 31, 2019 Share Posted December 31, 2019 (edited) I never like testing some theory using a complicated setup. So here's my very basic collision test. It looks pretty accurate to me. even at sim substep of 1 So obviously, your setup introduced other variables into the equation, trying to control a dozen different levers and setttings at the same time is a nightmare. is all that vdb neccessary ? or pressure or pin to target ? or multi vellum solvers ? my guess is it's a combo effect of the pressure and 'soft' pin to target...and not inaccuracy of collision as my simple test shows. vu_VellumTestThickness.hiplc Edited December 31, 2019 by Noobini Quote Link to comment Share on other sites More sharing options...
Noobini Posted January 1, 2020 Share Posted January 1, 2020 (edited) i butchered your scene to a more simple version....looks like the growing balls are the problems, if I totally ignore your pointvop (pscale) and use static balls, they collide quite accurately. Edited January 1, 2020 by Noobini Quote Link to comment Share on other sites More sharing options...
Noobini Posted January 1, 2020 Share Posted January 1, 2020 (edited) this version is with growing balls it's something to do with the copy Point Attributes, if i disable it, it works pretty good here. As said, I don't like debugging complicated file so here's my butchered version if you want to compare. EDIT: def something dodgy with your pointvop pscale. You can have copy point attributes but add ^pscale in to exclude copying pscale, it will work. dentedBooleanVellum_simple.hipnc Edited January 1, 2020 by Noobini 1 Quote Link to comment Share on other sites More sharing options...
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