Optional ReadonlybounceBounciness.
Fraction of vertical speed kept after a bounce. 0 = no bounce, 1 = perfectly elastic.
Optional ReadonlyfrictionFloor Friction. Fraction of horizontal speed and spin lost per bounce.
Optional ReadonlyyFloor Position.
Normalized canvas height (1 = bottom edge).
Floor Collision Settings. Particles bounce off a horizontal line and then rest there until their lifetime ends.