Unity

Movement

To make a GameObject respond to gravity and scripted forces, you need to attach a Rigidbody and check the use gravity box. Add a Collider for your GameObject to respond to contact with other GameObjects.

Using the physics engine

For scripted forces, use AddForce() (or AddTorque()). Don’t alter the Transform component. Leave the Collider unaltered to make your GameObject responds to contact with other GameObjects.

DIY

Check the is kinematic box on the Rigidbody. The physics engine won't apply forces and ignores collisions for this GameObject. The GameObject will still affect other objects with physics.

• You can now alter the Transform component to move the GameObject
• Check the is trigger box on the Collider to trigger an event when your GameObjects contacts another GameObject with a non-kinematic RigidBody or an is trigger Collider.

Collissions

GameObject and dead obstacle

When the obstacle GameObject shouldn't physically react in any way to a colliding GameObject, leave out the RigidBody or check is kinematic on it.

Check is trigger on the obstacle GameObject Collider. It's not necessary to check this on the other (player) GameObject as well: only one of the GameObjects needs to be a trigger. A trigger event (e.g. OnTriggerEnter(Collider other)) is sent to both Colliders and if present, the Rigidbodies attached to them.