The Acceleration defines the acceleration due to gravity. By default, this is set to Earth’s value of 9.81. A value of 0 means no gravity.
Use Variation to vary the gravity for each cluster.
This defines the direction of the gravity effect. To switch off gravity, choose None.
This (blue) frame defines the area in which gravity has an effect. However, all clusters inside the blast range (red frame) will be affected by gravity regardless.
Use Variation to prevent a perfect sphere of gravity.