rigidbody2D.MovePosition() doesn't apply gravity?

Why rigidbody2D.MovePosition() doesn't apply gravity,but rigidbody.MovePosition() apply gravity.
rigidbody2D.MovePosition(rigidbody2D.position + new Vector2(keyboardX, keyboardY));
rigidbody.MovePosition(rigidbody.position + new Vector3(keyboardX, keyboardY, 0));
These codes run difference result!!

 

I have this same problem. and dont solve this.

 

did a little testing on this, since there was another thread which was talking about something similar...

3d script

Spoiler

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. public class TestScript : MonoBehaviour
6. {
7.     Rigidbody rb;
8.     Vector3 movement;
9.    
10.     void Start()
11.     {
12.         rb = GetComponent<Rigidbody>();
13.         Debug.Log("3D " + Physics.gravity);
14.     }
15.    
16.     void Update()
17.     {
18.         float h = Input.GetAxis("Horizontal");
19.         float v = Input.GetAxis("Vertical");
20.         movement = new Vector3(h, 0, v);
21.     }
22.  
23.     void FixedUpdate()
24.     {
25.         rb.MovePosition(rb.position + movement);
26.     }
27.  
28. }
29.  

2d script

Spoiler

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. public class TestScript2 : MonoBehaviour
6. {
7.     Rigidbody2D rb;
8.     Vector2 movement;
9.  
10.     void Start()
11.     {
12.         rb = GetComponent<Rigidbody2D>();
13.         Debug.Log("2D " + Physics2D.gravity);
14.     }
15.  
16.     void Update()
17.     {
18.         float h = Input.GetAxis("Horizontal");
19.         float v = Input.GetAxis("Vertical");
20.         movement = new Vector2(h, v);
21.     }
22.  
23.     void FixedUpdate()
24.     {
25.         //if(movement.sqrMagnitude != 0f)
26.         //{
27.             rb.MovePosition(rb.position + movement);
28.         //}
29.     }
30.  
31. }
32.  

result (green rigidbody2d / testscript2, blue rigidbody/testscript)


if you include the commented out section of the 2d script so the moveposition is skipped if there is 0 input the gravity is applied correctly, however, doing a moveposition(currentposition + (0, 0)) results in gravity barely being applied.

The 3d rigidbody works fine with the moveposition(currentposition + (0, 0, 0)) included throughout.

 

@LeftyRighty Have you opened a bug report with the project from the gif?

 

Its not a bug. It says quite plainly in the docs that rb2d.MovePosition does not apply gravity

 

You're right about it not being a bug, but it is an inconsistency of behaviour of similarly named methods. I don't think the forum is the appropriate place to bring API differences to the attention of Unity for tracking, so the bugtracker seems to be the only place to document this.

 

Rigidbodies, be it 2D or 3D, should be manipulated with velocities and forces, not translation. The reason for the gravity being "barely applied" is because the velocity is constantly being reset, so the velocity is resetted while gravity is re-applied on every frame.