Dynamic hair has the following dynamic controls:

• Do Collisions: Checking the Do Collisions box enables collisions detection for the current hair group, which will prevent hairs from penetrating other objects in the scene (for example, long hair will not penetrate a figure’s head).
• Gravity: The Gravity parameter controls the strength of gravitational force acting on the hair.
• Spring Strength: The Spring Strength parameter determines the hair’s springiness. Increasing this value increases the springiness. A rubber band is a good example of an object with a high amount of springiness.
• Air Damping: The Air Damping parameter specifies the hair’s air resistance that occurs whenever the hair is moving through the air. Short hair has a lower resistance than long hair. Set this parameter with care as excessive values could cause the hair to behave unpredictably.
• Spring Damping: The Spring Damping parameter controls the hair’s elasticity.
• Bend Resistance: The Bend Resistance parameter controls the hair’s resistance to bending or folding upon itself.
• Position Force: The Position Force parameter is a force that pulls the hair vertices towards their choreographed position. Increasing this value decreases hair dynamics, and vice versa.
• Root Stiffness: The Root Stiffness parameter determines how stiff the hair is at its root.
• Root Stiffness Falloff: The Root Stiffness Falloff parameter controls how quickly the hair’s root stiffness decreases from root to tip.
• Calculate Dynamics: Clicking the Calculate Dynamics button applies the current dynamic settings to the selected hair group. The number of frames in the keyframed animation determines the calculation length. Populated hairs do not display during calculation.