Rotate Around Object

Questions & Answers
1

I have a cylinder, that I want to spin. Normally I would have no problem here with this code :

void Update () {
		
		wheel.Rotate(Vector3.right * rotateVelocity * Time.deltaTime);
	}

Unfortunately, this doesn’t work because the center of the wheel is offset far away. Centering it brings up some problems. So I want to manually set the center by putting an empty gameObject in the middle of the cylinder. I need the cylinder to rotate around the that empty gameObject. How do I set the object that I want the cylinder to rotate around?

2

What I have done in the past is that I set the cylinder as a child of the empty game object(once i have placed the game object where I want it) I then attach this Javascript to the cylinder, you will have to edit your x,y,z variables in the inspector to get it to rotate how you want:

var xSpeed : float = 1;

var ySpeed : float = 1;

var zSpeed : float = 1;

var manual : boolean = false;

function Update ()
{

if( !manual )
{

	transform.RotateAround( transform.position, Vector3.right, ySpeed * Time.deltaTime );
	transform.RotateAround( transform.position, Vector3.up, xSpeed * Time.deltaTime );
	transform.RotateAround( transform.position, Vector3.forward, zSpeed * Time.deltaTime );
	
}
else
{
	
	if( Input.GetAxis("Horizontal") != 0 )
	{
		
		transform.RotateAround( transform.position, Vector3.up, Input.GetAxis("Horizontal")*xSpeed * Time.deltaTime );
		
	}
	
	if( Input.GetAxis("Vertical") != 0 )
	{
		
		transform.RotateAround( transform.position, Vector3.right, Input.GetAxis("Vertical")*ySpeed * Time.deltaTime );
		
	}
	
}

}

3

Nevermind, I figured it out. I just used RotateAround, and set the position using a variable Transform. Here’s the code for anyone who wants it :

using UnityEngine;
using System.Collections;

public class SpinningWheel : MonoBehaviour {
	
	public float rotateVelocity;
	
	public Transform pivot;
	private Transform wheel;

	void Awake () {
	
		wheel = transform;
	}
	
	void Update () {
		
		wheel.RotateAround(pivot.position, Vector3.right, rotateVelocity * Time.deltaTime);
	}
}