Rope that can be in water

[josemendez]

Thanks for your answer, indeed I didn't saw the property externalForces in ObiSolver.

Hi!

The externalForces array is undocumented on purpose, since it is used internally by Obi's force zones. It's easy to break force zones by tinkering with it: your code overwrites the content of externalForces, so force zones will cease to work. You could fix this by adding the force instead of setting it to a fixed value.

Another option is to apply forces to the velocities array like this:

Code:

actor.solver.velocities[solverIndex] += MyForceForUnderWater * actor.solver.invMasses[solverIndex] * deltaTime;

Since F=ma, and acceleration is a change in velocity over time, your change in velocity is = F/m*dt.