This window sets how far a point can be from the center of the NURBS muscle and be properly sticky weighted.

Max. Distance from center of muscle

Lets you manually enter a maximum distance.

Auto-Calculate

Lets Maya Muscle determine the best overall distance from the muscle geometry center point to use for sticky binding.

To preview this distance, you can turn on the visualize spheres. See Visualize Sticky Bind distance.

Avg. Value

Uses the number you specify in the Max. Distance from center of muscle value field. (When more than one NURBS object is selected, the number displayed is the average for all of them.)

ALL Points

Connects the muscle so it can be weighted to any point on the mesh. You should only use this option if you can tolerate the resulting memory hit.