Hi guys, im having this problem for a long time, i thought that was a really simple problem but probably i was wrong.
So, my game have boundaries that are box colliders and everytime that i pick an object and drag it against the wall he passes through it. Objects have diferente sizes and forms what makes this trickier. Any ideas?
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As you don’t give any details about how you set this up regarding to physics beside mentioning the box colliders, I assume you don’t have anything else in there interacting with the physics simulation.
In that case, please first get a basic understanding about the other components that are needed for this to work by watching and understanding all beginner physics lessons:
http://unity3d.com/learn/tutorials/modules/beginner/physics
This is also good for an overview: Unity 3d: Collisions, Triggers, Rigidbodies, and Kinematics - YouTube