I created a simple 3d arrow (a box deformed from one side) and imported it to unity. Then I added a rigidbody and a sphere collider to it.
When the sphere contains the arrow inside it, the arrow interacts with terrain like the sphere, which is ok.
But when the sphere is inside the mesh, it just falls to the ground without any rotation afterwards.
1)I have no idea what does collider mean, as the unity script reference defines it as “A base class of all colliders”. I thought it is some kind of hitbox, but my object’s behavior in the second case, shows that I was wrong.
2)Besides, without adding a rigidbody the physics does nothing. So, it should somehow interact with the collider. Is it explained somewhere?
3)I need to specify a sub-object to my arrow which collision can easily be calculated by the engine. How can I do it?