The range of randomized restitution coefficients for particles. Animatable.
Mac Catalyst 13.0+
Setting a nonzero value for this property randomizes the effect of the particleBounce property. SceneKit randomly adjusts the restitution coefficient of each particle by up to half the particleBounceVariation value. For example, if the particleBounce value is 1.0 and the particleBounceVariation value is 0.5, each particle uses a random restitution coefficient between 0.75 and 1.25 for physics simulation.
The default value is 0.0, specifying no randomization.