koobas.hobune.stream
Rigidbody bumping when going down slopes
My rigidbody controller goes fine up a slope, but when I go down it, it bumps around. My collider is smooth around the edges. I use Rigidbody.MovePosition to move the player.
What is happening?
This usually happens when moving the rigidbody on a global axis ins$$anonymous$$d of it's local axis. Also is is$$anonymous$$inematic set to true?
Yes, but it's over 500 lines long, so I'll just give you the movement stuff
Vector3 movement = transform.forward * $$anonymous$$ovementInputValue * -moveSpeed * Time.deltaTime;
Vector3 finished$$anonymous$$ovement = rb.position + movement;
if (which$$anonymous$$ovement == movementType.rb$$anonymous$$ovePosition)
rb.$$anonymous$$ovePosition(new Vector3(finished$$anonymous$$ovement.x, transform.position.y, finished$$anonymous$$ovement.z));
else if (which$$anonymous$$ovement == movementType.rbAddRelativeForce)
rb.$$anonymous$$ovePosition(new Vector3(finished$$anonymous$$ovement.x, transform.position.y, finished$$anonymous$$ovement.z));
Ins$$anonymous$$d of using RigidBody.$$anonymous$$ovePosition alone. You can use a lerp function to make it smoother.
`Rigidbody.$$anonymous$$ovePosition (Vector3.Lerp (rb.position, finished$$anonymous$$ovement, 1f));`
Instead of using RigidBody.MovePosition alone. You can use a lerp function to make it smoother.
Rigidbody.MovePosition (Vector3.Lerp (rb.position, finishedMovement, 1f));
Alternatively you can move the object along the slope rather than the forward position.
HitInfo GetFloor() {
// Do raycast to get floor
Ray ray = new Ray (transform.position, vector3.down);
HitInfo hit;
Physics.Raycast (ray, out hit);
return hit;
}
Vector3 GetMoveDirection () {
var forward = transform.forward;
var floor = GetFloor();
if (floor.transform == null)
return forward;
var normal = floor.Normal;
var moveDir = new Vector3 (forward.x, -normal.y, for .z);
return moveDir.Normalize();
}
...
Vector3 movement = GetMoveDirection () * MovementInputValue * -moveSpeed * Time.deltaTime;
Vector3 finishedMovement = rb.position + movement;
if (whichMovement == movementType.rbMovePosition)
rb.MovePosition(new Vector3(finishedMovement.x, transform.position.y, finishedMovement.z));
else if (whichMovement == movementType.rbAddRelativeForce)
rb.MovePosition(new Vector3(finishedMovement.x, transform.position.y, finishedMovement.z));
No its C#, the bottom part should just replace some of the code you provided.
No, isKinimatic is set to false. Also, how do I move on the local axis, not the global axis?
In the docs for MovePosition it states that in order for a smooth transition it needs to be kinematic but that would be used for something like for example a 3rd person platformer enemy. A rigidbody ideally needs AddRelativeForce.
Thanks! The player movement is a lot smoother! What is the difference between the $$anonymous$$ovePosition and AddRelativeForce?
Basically $$anonymous$$ovePosition(Vector3.forward) is teleporting the rigidbody forward then relying on the physics to correct it afterwards. AddRelativeForce moves the rigidbody using the physics engine. $$anonymous$$ovePosition is better for is$$anonymous$$inematic which is like a rigidbody ignored by the physics engine but has methods which allow it to affect and react with other rigidbodies.
The tank still bumps around when going downhill...?
