Quad to rotate towards camera on y axis only

Question

I want to make a simple billboarding script that makes a quad follow the camera, but only limit it to the y axis. Currently I am using:

 transform.rotation = Camera.main.transform.rotation;

However, this rotates the object on the x and z axes as well. I simply want to constrain it to the y axis but i have encountered some errors when trying to add the y axis. I tried using LookAt but the object simply faces the camera away. Any one who can help me achieve what i want?

Answer 1

Answer by nickg111 · Nov 08, 2017 at 03:26 AM

I used this C# script... add it to the object you want, to follow the camera.

 using UnityEngine;
 
 public class Billboard : MonoBehaviour
 {
     void Update() 
     {
         // look at camera...
         transform.LookAt(Camera.main.transform.position, -Vector3.up);
         // then lock rotation to Y axis only...
         transform.localEulerAngles = new Vector3(0,transform.localEulerAngles.y,0);
     }
 }

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Answer 2

Answer by broughl · Jan 15, 2020 at 05:46 PM

crazy late but , i hate it when i stumble on posts that don't have the answer I'm looking for. should work with whatever up axis you want, and stays in world space.

 Vector3 upAxis = Vector3.up;
 transform.rotation = Quaternion.LookRotation(Vector3.Cross(upAxis,  Vector3.Cross(upAxis, Camera.main.transform.forward)), upAxis);

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Quad to rotate towards camera on y axis only

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