Help Is there a way to make the cloth work with High-Mass objets?

[unitydroid]

Hi to the Obi-Team, we are trying to build a trampoline and have choosen Obi-Cloth cause of its "Trampline Demo" in the Rigidbody-Example-Scene.

However, the Collision seems not to work if the Mass of the sphere is higher then 0.2 - 1, and it also does not work with high velocitys.

Even with alot tweaking we face the same problem on and on.

Are we missing something special or does the cloth do not work with high masses and velocitys?

Greets and keep up the good work.

[josemendez]

Hi to the Obi-Team, we are trying to build a trampoline and have choosen Obi-Cloth cause of its "Trampline Demo" in the Rigidbody-Example-Scene.

However, the Collision seems not to work if the Mass of the sphere is higher then 0.2 - 1, and it also does not work with high velocitys.

Even with alot tweaking we face the same problem on and on.

Are we missing something special or does the cloth do not work with high masses and velocitys?

Greets and keep up the good work.

Hi there,

Obi works with objects of any mass at any velocity. High mass objects (relative to the cloth's mass, this is a basic physics concept known as the "mass ratio") will exert more force on it and separate the particles, opening holes in the particle representation and slipping trough them. You can just:

- Increase the cloth particles' mass, so that the mass ratio between them and the sphere is lower. The default is 0.05, which can be very low for a 1 kg sphere as it results in a mass ratio of 1:20 (1:10 is the maximum recommended in most physics engines).

- Increase the amount of distance constraint iterations, so that they can better resist the high forces caused by the high mass ratio better.

- Reduce the timestep and/or add more substeps.

cheers,