Collision detection is a key component in creating a real world replica in the world of games. Writing your own collision detection system can be really painful and involves lot of mathematical calculations. So why waste your time writing something new when you have a lot of physics engines giving you out of the box [...]

What is a spring ?
A spring is a constraint similar to a joint , the only difference being that , in a spring constraint the constraint between 2 rigidbodies can be interchanged dynamically.
As in , during program execution one can change the constraint between rbA<->rbB to say rbA<->rbC .
Apart from this and the [...]