The Path Follow operator allows you to apply forces to particles using regular shapes and splines.

The default additive nature of forces can cause particles to quickly fly away from any input shapes. In order to cause particles to follow shapes more closely, force damping is required. The best way to dampen forces is to add a Slow operator to your event (above this operator) and increase the velocity slowdown value until the desired effect is achieved.

**Shape object list**: the list of input shape objects.

Follow forces are forces that are parallel to shape tangents.

**Velocity:**: the value of the force applied to particles.**Variation %**: the per-particle percentage of variation to apply.**Falloff**: the distance over which forces will be diminished, according to the inverse-square law. A value of 0 means no falloff will be computed.**Accel %**: controls how quickly particle forces will accelerate from their old values to the newly applied values.

Attraction forces are forces that are perpendicular to shape tangents, which cause particles to move toward shapes.

**Velocity:**: the value of the force applied to particles.**Variation %**: the per-particle percentage of variation to apply.**Falloff**: the distance over which forces will be diminished, according to the inverse-square law. A value of 0 means no falloff will be computed.**Accel %**: controls how quickly particle forces will accelerate from their old values to the newly applied values.

Spin forces are forces that are perpendicular to shape tangents, which cause particles to move around shapes.

**Velocity:**: the value of the force applied to particles.**Variation %**: the per-particle percentage of variation to apply.**Falloff**: the distance over which forces will be diminished, according to the inverse-square law. A value of 0 means no falloff will be computed.**Accel %**: controls how quickly particle forces will accelerate from their old values to the newly applied values.

**Spline interp**: the number of sub-segments to slice input shapes up into, which will be used to accelerate the shape proximity algorithm.

If shapes have a lot of overall curve complexity, this value should be increased.

**Lock to first closest shape**: controls whether particles will continually look for a new nearest shape to derive their forces from, or if they’ll stay locked to the same shape for their entire stay within the event.**Relative to mass**: controls whether particle forces will be relative to particle masses.**Simulate substeps**: forces will be interpolated in a way that simulates the addition of forces at smaller simulation substeps.

**Seed**: the seed value for all varied parameters.