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