Han Han Xue

johm
Hi Martin, this is mostly an issue having to do with the mass being calculated per point based on the size (volume) of the tet mesh and the supplied Density value. The smaller object effectively has a total mass of 0.001 times the larger box. Try setting your Mass Density to 1000 and increasing Substeps. Try at least 4 substeps for the sim to converge properly. This should get you in the ballpark where you can start adjusting stiffness values.
-j

Hi! Just curious if the smaller object is .001 times less dense, and the default density is .1, why do we need to set density to 1000 instead of .1 x 1000 = 100?

Asking because I tested the scene and the 1000 value looks more correct in the sim but don't understand now the conversion work