25-02-2020, 12:22 PM
(21-02-2020, 01:36 PM)josemendez Wrote: A sleep threshold is basically low kinetic energy. Kinetic energy of a body is defined as: 1/2 * mass * velocity^2. If that value is lower than a threshold for all particles, you know the rope isnt moving. Since you’re only interested in visual movement (not energy) you can drop the mass term:
1/2 * velocity^2.
The 1/2 is just a constant, that you can fold it over to the threshold value. Also the square.
So it all boils down to iterating over all particles in the rope and checking if their velocity is smaller than a threshold. If it is, you can disable the solver. If you find a single particle whose velocity is over the threshold, you must keep the solver enabled, so in most cases it’s an early out.
I'm sorry but without 5.1 API docs it's hard to figure out how to iterate over all particles. Do I get them through the Obi rope or the solver? What is an element vs a particle? An element is a connection between two particles? but i cannot get the velocity of a single particle?