The Push In/Out operator allows you to push particles in/out of closed surfaces.
Sample type: controls which sampler will be used for in/out tests.
Accuracy: controls the accuracy of the raycaster used to compute information about whether a particle is inside or outside of an object’s volume.
Affect position: controls whether particles will be forcefully moved in/out of volumes.
Offset: the amount of additional positional offset to apply to particles, along the direction they are moved in/out of a surface.
Affect velocity: controls whether particle velocities will modified with the vector required to move them in/out of a surface.
Influence: the amount of influence the in/out vector will have on a particle’s velocity.