add more hint to Pendulum.cpp, revise the typo error in collision.md #573
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There is some code in lesson 2a of Pendulum:
for(size_t i = 0; i < mPendulum->getNumDofs(); ++i)
{
DegreeOfFreedom* dof = mPendulum->getDof(i);
double q0 = dof->getRestPosition() + delta;
dof->setRestPosition(q0);
}
the variable delta may be the parameter of the functions, but the tutorial don't say where the variable 'delta' comes from.
http://dart.readthedocs.org/en/release-5.1/tutorials/multi-pendulum/#lesson-2a-set-joint-spring-rest-position
User may need read the finished file and get hints.
There is a typo error in collision.md