Permeability collision problem with ocean modifier and particles emitter

actually I have a permeability problem with a surface ocean which collide with particles.
When I animate the ocean’s time parameter, an important part of the particles cross the ocean surface in spite of a collision permeability parameter at zero.
Is anybody knows the solution ?

Moved from “General Forums > Blender and CG Discussions” to “Support > Particles and Physics Simulations”

Maybe modifiers order is not good. Collision modifier should be after Ocean modifier.
Maybe particle system cache step is too high. By default, its value = 10. Try to set it to 1.
If it is still not enough; try another integrator like RK4 or subframes.

The solution is the subframe. Thank’s guy :slight_smile: