How do I do collision detections?

Collision detection has been for a long time a fundamental problem in computer animation, physically based modeling, geometric modeling, and robotics. In these applications, interactions between moving objects are modeled by dynamic constraints and contact analysis. The objects' motions are constrained by various interactions including collisions. A fast and interactive collision detection algorithm is a fundamental component of a complex virtual environment. To get a feeling of presence, the objects in the surrounding world should feel solid. That's they should not pass through each other, and things should move as expected when pushed, pulled or grasped. Such actions require accurate collision detection, if they are to achieve any degree of realism.

Collision detection can be achieved by surrounding your 3D models with a boundary box,sphere or ellipsoid as this reduces the memory requirements a great deal. Depending on the boundary object they are called as Cubical, Spheroidal, Elliptoidal collision detection schemes.

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