The Trail Controller can be used to affect a series of bones in a hierarchy.
Reference to the active bone in the hierarchy to modify.
Number of bones above the active one in the hierarcy to modify. Chain Length should be at least 2.
Chain Bone Axis
Axis of the Bones to point along trail.
Invert Chain Bone Axis
Whether or not to invert the direction specified in Chain Bone Axis.
Trail Relaxation Speed
How quickly we "relax" the bones to their animated positions. Time 0 will map to top root joint, time 1 will map to the bottom joint.
Limit the amount that a bone can stretch from its ref-pose length.
If Limit Stretch is true, this indicates how long a bone can stretch beyond its length in the ref-pose.
The "fake" velocity applied to bones.
Actor Space Fake Vel
If "fake" velocity should be applied in Actor or World Space.
Base Joint to calculate velocity from. If none, it will use Component's World Transform.
The incoming pose.
The current strength of the control.
Trail Controller nodes are also affected by the LOD Threshold system introduced in 4.11. You can find the setting for this in the Details Panel for the Trail Controller node.