is the effect of multiple objects colliding
continuously with each other. Lighter (less massive
) objects are affected to a lesser extent by friction
; heavier (more massive) ones are affected to a greater extent.
An object's friction
can be changed by modifying its material
also affects friction
- There is no air friction, or water friction for that matter. Havok-1 has a built-in 'friction' method however it is numerically unstable, especially for small objects, and requires a lot of tuning to the physics engine and parameter space to make it work right. Someday there may be air friction, but it would have to be enabled on a per-object basis -- some people won't want their stuff getting blown away by the wind. (Andrew Linden, 5/2/06)