From Mathf.MoveTowards to rigidbody.MovePosition

Hi Everybody,

For a couple of days now I'm trying to "convert"

Code (JavaScript):

1. transform.position.x = Mathf.MoveTowards(transform.position.x, target.transform.position.x, Time.deltaTime*speed);

into something with rigidbody.MovePosition:

Code (JavaScript):

1. rigidbody.MovePosition(transform.position + target.transform.position * Time.deltaTime*speed);

but I do not succeed.
The only thing I want is that the gameobject goes towards the targetobject in the x-direction using rigidbody.MovePosition.
Can somebody point me in the right direction?

 

Rigidbody.MovePosition doesn't quite work like MoveTowards, but you could just combine them:

Code (csharp):

1.  
2. Vector3 movePosition = transform.position;
3.  
4. movePosition.x = Mathf.MoveTowards(transform.position.x, target.transform.position.x, speed * Time.deltaTime);
5.  
6. rigidBody.MovePosition(movePosition);
7.  

 

Thanks for reply.
The problem is that you have some kind of jitter when the character is walking against a wall using Mathf.MoveTowards.
With rigidbody.MovePosition you don't have that jitter I think.
When you combine Rigidbody.MovePosition and MoveTowards, you still have that jitter.

 

Herbie, looks like you should be doing:
((transform.position+ target.transform.position) * Time.deltaTime*speed);
Instead of:
(transform.position+ target.transform.position* Time.deltaTime*speed);

I hope this stops the jittering that you mentioned, it's really annoying

edit: In fact, you might want to use rigidbody position instead of transform position for this...

 

If you're doing this inside of Update instead of FixedUpdate, that might also be a cause of the jitter.

 

Thanks.

It's still not working good.
With rigidbody.MovePosition the gameobject goes towards the targetobject but it doesn't stop when it is there (of course).
Is there another way to move a rigidbody from one point to another with the physics engine, just like Mathf.MoveTowards?

 

Check this out:

http://docs.unity3d.com/ScriptReference/Rigidbody.MovePosition.html

So, if you are in FixedUpdate() you will want to use MovePosition WITH MoveTowards to get smooth motion over time. MovePosition only smooths between fixed updates since multiple render updates occur between fixed updates.

However, directly moving a rigidbody against a collider (or wall) will always cause a jitter. If you want the rigid body to respect physical collisions but be moved through script, you can try moving it with forces.

Code (csharp):

1.  
2. float speed = _rigidbody.velocity.magnitude;
3. _rigidbody.AddRelativeForce(rightLeftAcceleration/ (speed + 1f), 0f, forwardBackAcceleration/ (speed + 1f), ForceMode.Acceleration);
4.  

Dividing by the current speed plus one makes the rigidbody approach a steady speed instead of going faster and faster.