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Question by mmishra2861 · Nov 16, 2014 at 10:09 PM · 2dorbit2d rotation

orbiting an object help (from 3d to 2d)

Hi everybody,

I am pretty new to unity, and am trying to convert this script from 3d to 2d. I need to have it circle an object solely on the x,y axis. Any suggestions?

Here is my code: using UnityEngine; using System.Collections;

public class orbit : MonoBehaviour {

 // Use this for initialization
 void Start () {
 
 }
 public Transform target;
 void Update () {
     Vector3 relativePos = (target.position + new Vector3(0, 1.5f, 0)) - transform.position;
     Quaternion rotation = Quaternion.LookRotation(relativePos);
     Quaternion current = transform.localRotation;
     transform.localRotation = Quaternion.Slerp(current, rotation, Time.deltaTime);
     transform.Translate(0, 0, 3 * Time.deltaTime);
 }

}

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avatar image Scribe · Nov 17, 2014 at 11:40 AM 0
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transform.RotateAround is a built in function designed for this purpose! check it out in the docs here

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Answer by troien · Nov 17, 2014 at 11:04 AM

I'm not sure if I understand this line of you correctly 'circle solely on x,y axis'. But if I do then this piece of code should make it rotate in the same way as your current code, except that only x and y position change, z stays the same. I used this forum post (the answer from yuriythebest) to make this.

 Quaternion newRotation = Quaternion.LookRotation(transform.position - target.position, Vector3.forward);
         newRotation.x = 0;
         newRotation.y = 0;
         newRotation *= Quaternion.Euler(-90, 0, 90); // Rotate to make the forward instead of he up face our target
         transform.rotation = Quaternion.Slerp(transform.rotation, newRotation, Time.deltaTime * rotateSpeed);
 
         transform.Translate(0, 0, speed * Time.deltaTime);

speed and rotateSpeed are public float variables.

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