## Spin operator

The Spin operator allows you to add spin motion to particles.

#### Spin Rate

• Spin magnitude type: the method used to derive the magnitude of the spin vector.

By Value: the magnitude will be set to an absolute value.

Inherit Previous: the magnitude will be set to the particle’s current spin magnitude.

• Spin rate: the rate, in degrees per second, to spin particles.
Variation: the per-particle amount of variation to apply.
• Relative to radius: the spin magnitude will be relative to a particle’s radius.

• Relative to velocity: the spin magnitude will be relative to a particle’s velocity.

• Velocity: the threshold velocity value.

• Relative to mass: the spin magnitude will be relative to a particle’s mass.

#### Spin Axis

• Spin axis type: the method used to derive the axis of the spin vector.

Random 3D: the spin axis will be a random 3D vector.

World Space: the spin axis will be a user-defined vector in world-space coordinate.

Inherit Previous: the spin axis will be set to the particle’s current spin axis.

Travel direction: the spin axis will be aligned to the particle’s travel direction.

Travel direction: the spin axis will be aligned towards/away the closest input object, depending on the sign of the magnitude.

• X/Y/Z: the values of the user-defined spin axis vector.

• Allow mirror: controls whether some particles will spin in the opposite direction.

• Divergence: the degrees of random divergence to apply to the resulting axis vector.

#### Objects

• Input object list: the list of scene objects to use for towards/away spinning.

• Distance: particles within this distance will be fully affected.

• Falloff: the effect on particles beyond the base distance, but within this falloff distance, will diminish according to the inverse-square law.

#### Interpolation

• Value: the amount to interpolate particle spin values from their previous value to the new value.

• Variation %: the per-particle percentage of variation to apply.

#### Uniqueness

• Seed: the seed value for all varied parameters.