PhysX Drag Operator

Speed Factor Multiplier - Allows an additional damping-factor adjustment, in relation to particle speed. This is useful when particles travel through a medium whose slowdown factor is proportional to the particle speed: the higher the speed, the greater the slowdown factor.

When Speed Factor Multiplier is on, the Speed Unit and Spin Unit parameters become available.

• Speed Unit - The speed value in linear units per second at which Linear Damping is applied at the specified value (see Damping Factor, preceding). If the actual speed of a particle is twice the Speed Unit value, then the Linear Damping Factor applied is twice the specified value; it's a direct proportion. The same applies to slow particles: If a particle's actual speed is half the Speed Unit value, then the damping factor applied is half that of the specified value.

• Spin Unit - Works the same as Speed Unit but with respect to particle spin rate and the Angular Damping Factor setting. Spin Unit is measured in degrees of rotation per second.

Example 1:  PhysXDrag_SpeedFactor_MultiSpeedUnit.zip

Example 2:  PhysXDrag_SpeedFactor_MultiSpinUnit.zip