A physics modifier that bounces the particles off the ground. It runs on each step before the integration and changes only the velocity.
A particle collides when its world height is below the terrain height plus
GroundHeightOffset. If it is moving down, its vertical speed is reversed and
multiplied by Bounce, and its horizontal speed is multiplied by 1 - Friction. The
test uses the particle's world velocity of the previous step.
The modifier never moves the particle back above the ground. A particle that is already below the surface stays there, and only its velocity changes.
Flag = true Where the terrain height is read. When set, the height is read once per step at the emitter's position and used for every particle, so the collision surface is flat. When clear, it is read per particle at the particle's own world position.
Fraction of the downward speed that is kept, reversed, after a collision. Clamped to
[0, 1]: 0 stops the particle's vertical motion, 1 is a perfect bounce.
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Fraction of the horizontal speed that is removed on each colliding step. Clamped to
[0, 1].
Height of the collision surface above the terrain, in world units, as a float driver value.