Jumpy movement with 2d physics

I really didn't want to post this, the shear volume of topics about jumpy movement is insane, but I'm completely stumped and pretty frustrated!

I have a very simple 2d scene, with a player (rigidbody2D) moving based on physics2d, on x at an increasing speed, and y in a wave-like motion using gravity and then turning gravity off and AddForce to move upwards, then turning gravity back on to move back down. (imagine a fish jumping in and out of water).

The camera is following the fish, using simply transform.position and the scenery is all very slightly jumpy/stuttering. It's subtle but very noticeable.

I've tried literally EVERY solution others have had success with but have had no luck. I think I've done something wrong in my movement scripts but I don't know what.

Here is what I've already tried:

1. Interpolate on player rigidbody - This makes the problem worse
2. vsync off - again, this makes it worse
3. using SmoothDamp on the camera instead of transform.position - This makes the scenery perfectly smooth, but the player is then the jumpy object, and about 4x as noticeable.
4. Settings a constant velocity on the player instead of AddForce to gradually incrase - I thought it could be the dynamic speed causing issues, but no, I still get problems at a constant speed.
   
5. Setting a fixed frame rate - no difference
6. Setting the camera's movement in FixedUpdate instead of Update
7. Setting the camera movement in LateUpdate instead of Update
8. Setting the player velocity/addForce in Update instead of FixedUpdate

The player is a gameobject containing a few sprites and the camera should follow it (with a bit of offset). The rest of the objects in the scene are completely static (for now, eventually it will be animated).


Here are my movement scripts:

Player

Code (CSharp):

1. void FixedUpdate()
2. {
3.     if ( running )
4.     {
5.         if ( rigidbody2D.velocity.x < targetVelocityX )
6.         {
7.             rigidbody2D.AddForce( Vector2.right * runForce );
8.         } else {
9.             rigidbody2D.velocity = new Vector2( targetVelocityX, 0 );
10.         }
11.  
12.         if ( rigidbody2D.velocity.x > speedToJump ) {
13.             // jump
14.             rigidbody2D.velocity = new Vector2( rigidbody2D.velocity.x, maxVelocity );
15.             rigidbody2D.gravityScale = 1;
16.             running = false;
17.         }
18.  
19.     }
20.  
21.     // limit y velocity
22.     if ( rigidbody2D.velocity.y > maxVelocity ) rigidbody2D.velocity = new Vector2( rigidbody2D.velocity.x, maxVelocity );
23.    //limit x
24.    if ( rigidbody2D.velocity.x > targetVelocityX ) rigidbody2D.velocity = newVector2( targetVelocityX, rigidbody2D.velocity.y );
25. }

Camera

Code (CSharp):

1. void Update()
2. {
3.     transform.position = new Vector3( player.transform.position.x + offsetX, player.transform.position.y, player.transform.position.z );
4. }

Water

Code (CSharp):

1. void OnTriggerStay2D(Collider2D collider)
2. {
3.     if ( collider.tag == "Water" )
4.     {
5.         playerScript.inWater = true;
6.         rigidbody2D.gravityScale = 0;
7.  
8.         rigidbody2D.AddForce( new Vector2( 2 , ( rigidbody2D.mass * buoyancy ) ) );
9.     }
10. }
11.  
12.  
13. void OnTriggerExit2D(Collider2D collider)
14. {
15.     if ( collider.tag == "Water" ) {
16.         playerScript.inWater = false;
17.         rigidbody2D.gravityScale = 1;
18.  
19.     }
20. }

Thanks!

 

Thanks Mike! Ok I'll give it go taking out all instances where I adjust velocity directly. So, for example, on line 14 of the player script where I make the player jump at a defined speed, I'll need to figure out what force I need to add to achieve that speed instead of setting the y velocity directly to it?

 

I've replaced all instances of "rigidbody2d.velocity =" with "rigidbody2d.AddForce()" and it doesn't seem to have made any difference.

 

Hey Luke, I am having the exact same issue as you, have you since solved the problem, maybe we can chat and I can show you the issue I'm having?