Game Development Reference
In-Depth Information
t = ( n × v r ) × n
t = t / | t |
For many problems that you'll face, you may be able to reasonably neglect friction in
your collision response routines since its effect may be small compared to the effect of
the normal impulse itself. However, for some types of problems, friction is crucial. For
example, the flight trajectory of a golf ball depends greatly on the spin imparted to it as
a result of the club-ball collision. We'll discuss how spin affects trajectory in the next
chapter, which covers projectile motion.
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