Help Cloth has stretchy behaviour with stiff settings

[josemendez]

Unless i understood the wiki incorrectly, the obicloth settings i have for that cloth should make it very stiff, and not allow for much stretching or deformation.

Hi!

Quite the opposite: your settings will yield rather stretchy cloth. Specifically, your compliance is set to 0.01 N/m2 which is extremely high (for comparison, the compliance of rubber is 1x10^-6)

Keep in mind that compliance is the inverse of stiffness: a compliant material is stretchy, a non-compliant material (that is, a material with zero compliance) is as stiff as possible given the current solver settings.

The Obisolver is essentially at default settings, i only changed the distance constraint to be Parallel and have 6 iterations to remove some jittering i was having

Don't tweak iterations unless you need to balance out cost with other constraint types. As mentioned in the manual, the ideal setup is to set all iteration counts to 1 and increase the amount of substeps instead. Substeps are far more efficient at improving simulation quality than iterations.


As a side note, I see you're using surface collisions with a considerably dense mesh. Such use case is specifically discouraged in the manual as it will lead to very costly collision detection and no noticeable benefit.

kind regards,