follow an object's x-axis and have it translate smoothly into another object's z-axis rotation

Question

I'm making a 2.5 side scroll game. Game objects are 3D but the game is essentially 2D.

I have Ship B tracking Ship A's position along the x and y axis. When A moves past B in the side-scroll , I want B to Rotate around it's Y-axis as it is tracking A's movement.

I have script that does this but the Rotation around Z-axis is instantaneous. I need to slow it down to A's speed as it passes B from left to right. Sort of how an helicopter banks to make a turn. I don't need realism, Just need a smooth movement to show Ship B's 3D profile.

public class LookAtTarget : MonoBehaviour { public Transform target;

      void Update()
      {
      float lockPos = 0;
 {
      transform.rotation = Quaternion.Euler(lockPos, transform.rotation.eulerAngles.y, lockPos);
 }

           if(target != null)
           {
                transform.LookAt(target);
           }

      }
 }

Answer 1

Answer by Julian-Glenn · Aug 07, 2010 at 11:43 PM

Something like this may work *note not tested javaScript code

var rotationSpeed = 5.0; var theTarget : Transform;

function RotateTowards (position : Vector3) {

     var direction = position - transform.position;
     direction.y = 0;
     if (direction.magnitude &lt; 0.1)
         return;

     // Rotate towards the target
     transform.rotation = Quaternion.Slerp (transform.rotation, Quaternion.LookRotation(direction), rotationSpeed * Time.deltaTime);
     transform.eulerAngles = Vector3(0, transform.eulerAngles.y, 0);
 }

And call it like so:

RotateTowards(theTarget);

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Julian-Glenn · Aug 07, 2010 at 11:46 PM 0

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You'll have to change the Axis to suit your needs but this will rotate towards the target at whatever speed you wish

Vitruvius · Aug 08, 2010 at 12:04 AM 0

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Thanks for the code but I'm getting an error msg.

The best overload for the method 'LookAtZturn.RotateTowards(UnityEngine.Vector3)' is not compatible with the argument list '(UnityEngine.Transform)'.

· Aug 23, 2010 at 02:55 AM 0

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You should be calling: RotateTowards(theTarget.position); It's expecting a Vector3, but being passed a Transform.

follow an object's x-axis and have it translate smoothly into another object's z-axis rotation

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