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Question by starocean102 · Apr 27, 2016 at 05:22 AM · c#transform.rotate

Hi how do I rotate an game object, like a car?

I'm kind of new to this unity thing I've made my own like rocket ship type model, and I want it so when I press A and D it rotates the object not move it side to side, Any suggestions? The script Im using for moving right now only moves it left/right forward and back with no rotation. Any help would be appreciated thank you :)! Basically some type of steering so its more realistic, :)

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Answer by toromano · Apr 27, 2016 at 06:49 AM

You can learn about ackerman steering from here: https://en.wikipedia.org/wiki/Ackermann_steering_geometry

I attached a dummy pivot gameobject for rotation since rotation should be around back wheel center. I also added sample script for steering. Just add to an cube and test.

 using UnityEngine;
 using System.Collections;
 
 public class SteeringTest : MonoBehaviour
 {
     public float backWheelDistance = 1;
     private GameObject dummyPivot;
     float turningCenterDistance = 5;
     void Start()
     {
         dummyPivot = new GameObject("dummyParent");
         dummyPivot.transform.parent = this.transform;
         dummyPivot.transform.localRotation = Quaternion.identity;
         dummyPivot.transform.localPosition = Vector3.zero;
         dummyPivot.transform.parent = null;
         this.transform.parent = dummyPivot.transform;
         this.transform.localPosition = new Vector3(0, 0, backWheelDistance);
     }
 
     void Update()
     {
         if (Input.GetKey("left"))
         {
             Vector3 turningPivotPoint = dummyPivot.transform.TransformPoint(new Vector3(-turningCenterDistance, 0, 0));
             dummyPivot.transform.RotateAround(turningPivotPoint, -Vector3.up, 20 * Time.deltaTime);
         }
         else if (Input.GetKey("right"))
         {
             Vector3 turningPivotPoint = dummyPivot.transform.TransformPoint(new Vector3(turningCenterDistance, 0, 0));
             dummyPivot.transform.RotateAround(turningPivotPoint, Vector3.up, 20 * Time.deltaTime);
         }
     }
 }

Hope that helps!

[1]: /storage/temp/68924-488px-ackermann-turningsvg.png


488px-ackermann-turningsvg.png (39.5 kB)
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avatar image starocean102 · Apr 28, 2016 at 02:22 PM 0
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Thank you for your help I just have a question! When I turn left or right when its applied the object rotates but it also goes backwards? Did I somehow mess up the script in the process of applying it to the game object

avatar image starocean102 · Apr 29, 2016 at 06:36 AM 0
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Thank you so much! I'll let you know if I have any problems :)

avatar image MegasonicZX · Oct 13, 2019 at 10:16 AM 0
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I know this is like 3 years old but do you remember what your train of thought was in making the dummyPivot the parent transform after making the cube the transform? I don't completely understand how this script works.

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