koobas.hobune.stream
Making a specific axis look at an object
How can i get something to look at something but just on one axis, such as the y axis, so the object is always looking at an object but never looking up or down, just left and right, always following the object. I tried this code and it didnt work:
var PlayerObj : Transform;
function Update () {
transform.rotation.y.LookAt(PlayerObj);
}
Please help!
You could try to make 2 vector3's with the same x and z position and than use the LookAt function on Quaternion. Than it will rotate on only the y axis. Or you could make a new quaternion, set it equal to the current rotation, then rotate the object and reset everything in the wuaternion exept for the y rotation. Only problem is, quaterions are realy difficult to understand so if you use the second method, and you run into a problem, try the first :)
Hope this helps!
Yeah, im kind of a noob. I understand many things, but i never seemed to understand Quaternions. $$anonymous$$ind giving me an example based on my script thats in the post?
He means something like this:
function Update(){
var pos = target.position; // get the target position...
pos.y = transform.y; // but at this object's height
transform.LookAt(pos); // then look at it
}
C#
using UnityEngine;
using System.Collections;
public class Yrotater : MonoBehaviour
{
public Transform lookAt;
void Update()
{
Vector3 worldLookDirection = lookAt.position - transform.position;
Vector3 localLookDirection = transform.InverseTransformDirection(worldLookDirection);
localLookDirection.y = 0;
transform.forward = transform.rotation * localLookDirection;
}
}
Well, i will see what i can do with this. I dont code in C# so i dont know what the first 3 lines mean, but i believe i understand the rest. I will approve your answer if it ends up being correct.
In UnityScript:
function Update(){
var worldLookDirection = lookAt.position - transform.position;
var localLookDirection = transform.InverseTransformDirection(worldLookDirection);
localLookDirection.y = 0;
transform.forward = transform.rotation * localLookDirection;
}
This is a more complete case, where the object will rotate strictly around its local Y axis (even if its inclined relative to the world Y axis). $$anonymous$$ore often, the object must simply rotate around the world Y axis, which simplifies things:
function Update(){
var lookDirection = lookAt.position - transform.position;
lookDirection.y = 0;
transform.forward = transform.rotation * lookDirection;
}
