The moving platform - physics problems

Unity Engine
1

Hi

I found a script here on the forums by Raiden that I tried to create a moving platform. Code:

// simple x,y,z movement over a distance
var duration = 1.0;
var is2D = true;
var posEndDistance : Vector3;
private var posStart : Vector3;
private var posEnd : Vector3;

function Start () { 
  posStart = transform.position; 
  if (is2D) { posEndDistance.z = 0.0; } // force no movement on the "z" axis
  // I could have used Vector3 to assign, but this looks more readable to me
  posEnd.x = transform.position.x + posEndDistance.x;
  posEnd.y = transform.position.y + posEndDistance.y;
  posEnd.z = transform.position.z + posEndDistance.z;
} 

function Update () {
	var lerp = Mathf.PingPong (Time.time, duration) / duration;
	transform.position = Vector3.Lerp (posStart, posEnd, lerp);
}

I have simple cubes with rigidbody attached to them, situated on the platform. The platform itself is also just a simple cube. Problem:

  1. If I don’t attach a rigidbody to the moving platform then the cubes will not move along with the platform (friction).

  2. If I attach a rigidbody then the cubes will move in a jerky fashion while on the platform, sometimes falling through the actual geometry while at other times getting stuck in the platform.

Any help would be greatly appreciated!

2

personally I prefer to use parenting when i want objects to move with other objects.

3

Thanks meh11, setting it as isKinematic got it closer to the behavior I wanted. I’ll see if I can’t pick it up from there :slight_smile: