About Input Loads Available for Display Arrows
These are the different colors for forces and torque arrows on the Display Arrows tab of the Playbacks dialog box:
• Gravity—Brown arrow with the tip at the center of mass for each body, pointing in the direction of the gravitational acceleration.
• Degrees of Freedom (DOF)—A green arrow represents a force motor with the tip at the specified motion axis, pointing in the direction of the joint's DOF.
• Force—Orange arrow with the tip at the point of application.
• Torque—Double-headed, orange arrow pointing toward the center of mass of the body.
• Point to Point forces—Two colinear, magenta arrows with the tips at the specified points or vertexes, pointing towards each other for negative forces and away from each other for positive forces.