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I am having a Three OBJ file , Cone , Sphere and Cube. How can i find the dimension of these objects , so that i can use it in my collision detection class.

i.e How can i find Radius , Length of Cube and Radius and Height of cone. Or is there any better way for collision detection , I have Hundreds of random particle in my game which may or maynot collide with these objects.

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