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Question by RPDEV · Dec 06, 2013 at 01:13 AM · fallingcolliding

Make character fall when colliding with an object

Hello. I have an object with a rigid body that can move left and right and jump on platforms. The problem I have is that when the character jumps off a platform and then moves into the platform it gets "stuck" and is unable to fall if the button is held down. What would be the best way to fix this? I figured I need to disable the direction it was moving, but I'm not sure how to do that without breaking the other direction.

The code I currently have is:

 // Update is called once per frame
 void FixedUpdate () {

     Vector3 p = mainCharacter.transform.position;

     if (Input.GetKey (KeyCode.A)) 
     {
         p.x -= 0.2f;
     } else     if (Input.GetKey (KeyCode.D)) 
     {
         p.x += 0.2f;
     }

     if (Input.GetKey (KeyCode.Space)) 
     {
         if (isJumping == false)
         {
             mainCharacter.rigidbody.AddForce(Vector3.up * JumpForce);
             isJumping = true;
         }
     }

     Debug.Log (mainCharacter.rigidbody.velocity.y.ToString ());

     mainCharacter.transform.position = new Vector3(p.x, p.y, 0);
     mainCamera.transform.position = new Vector3(p.x, p.y + 2, -10.0f);
 }

 void OnCollisionEnter(Collision col)
 {
     if (col.gameObject.tag == "Land") 
     {
         isJumping = false;
     }
 }
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Answer by iStrangler.com · Dec 06, 2013 at 03:55 AM

NEVER use the position of a rigidbody directly to move it.

Instead use THIS or THIS. Add a force in the direction you want to move. Activate gravity in the rigidbody and it will fall down automatically.

For your interest: See the Time.deltaTime in the code samples? Your code would have different results, depending on the frames per second. You have to use Time.deltaTime to make it FPS independent. :)

Read THIS!

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