Fill a jar with little spheres

[mazi710]

Thank you very much, I know now for time step    but I wasn't aware gravity matter so much... (sorry for my poor english)

Gravity doesn't matter technically be the amount the particles move each frame matters. So lets say your gravity is -0,1 you need 1/2 Substep for example, then with -0,2 gravity you need 1/4 Substep to get the same calculations. So the more the particles move each frame the more substeps you need.