The Mass operator allows you to control the mass of particles. The mass value of a particle will affect the way it behaves within the bind solver, as well as the PhysX solver.
Value: the initial absolute mass value assigned to particles.
Clamp min: the minimum allowable mass value.
Clamp max: the maximum allowable mass value.
Relative to volume: controls whether assigned mass values will be relative to particle shape volume.
Target volume: the target volume that particle volumes will be compared to, when assigning mass values.
Exponent: the exponent that particle volume ratios will be raised to. Larger exponent values will increase the mass disparity between large and small volumes.
Invert: controls whether the resulting volume ratio will be inverted.
When “relative to volume” is on, the following equation is used to calculate particle masses:
mass = pow(volume/(target volume), exponent)
Relative to bindings: controls whether masses will be affected by their distance to deactivated/kinematic particles in their binding network.
Particle bindings: regular particle bindings will be considered in the breadth-first traversal of the binding network.
PhysX bindings: PhysX bindings will be considered in the breadth-first traversal of the binding network.
Multiplier: the multiplier applied to masses, relative to their depth in the breadth-first search.
Exponent: the exponent applied to the depth-relative multiplier. The larger the exponent, the greater affect the multiplier will have on particles relative to their depth in the breadth-first search.
Set: controls whether to override the local center of mass offset value on PhysX particles.
X/Y/Z: the axis values for the center of mass offset, relative to the local particle transform.