This compound modifies particle or object parameter values when the particles or object's points are within a null's icon shape.
Plug its Value (scalar) output into any compound's port that accepts scalar data, such as the Speed, Mass, and Size ports on the Emit compound.
If you use this compound with the Emit compound, you need to plug another instance of its Value output into a Set Data compound for the type of data you're modifying (such as Set Particle Size if you're modifying the Size parameter). Then plug this Set Data compound into a port on the ICETree node so that the data is evaluated at every frame instead of just once at emission.
For more information, see Modifying Particle Values by Null or Volume [ICE Particle Simulations].
Tasks: Particles/Modifiers,Deformation/Modifiers
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