koobas.hobune.stream
The question is answered, right answer was accepted
LookAt only when camera position changes
Hi!
I'm trying to optimize the script use to look at the main camera due to I have plenty of objects. I'm trying just to Update the LookAt when the camera position has changed, but I don't know how to do it. My script is the following one:
private SpriteRenderer sRenderer;
private Vector3 position;
private Camera mainCamera;
private void Awake()
{
mainCamera = Camera.main;
position = this.transform.position;
sRenderer = this.GetComponent<SpriteRenderer>();
}
protected virtual void LateUpdate()
{
if (this.sRenderer.isVisible)
{
if (Time.frameCount % 30 == 0)
{
transform.LookAt(position + mainCamera.transform.rotation * Vector3.forward, mainCamera.transform.rotation * Vector3.up);
}
}
}
I can suggest you events. Create an event to detect your camera position change and register your object's script to that event.
//Attach this to main camera and detect position changes here
public class CameraPositionChange : MonoBehaviour {
public delegate void camPositionDelegate(GameObject cam);
public static event camPositionDelegate camPositionChangeEvent;
private Vector3 lastPosition;
public static void CamPositionChange(GameObject cam) {
if (camPositionChangeEvent!= null) {
camPositionChangeEvent(cam);
}
}
void Start(){
lastPosition = transform.position;
}
void Update(){
if(transform.position != lastPosition){
lastPosition = transform.position;
CamPositionChange(this.gameObject);
}
}
}
//this is your already existing script that you attach to target object.
public class YourAlreadyExistingClass : MonoBehaviour {
private SpriteRenderer sRenderer;
private Vector3 position;
//private Camera mainCamera; //you won't need this anymore
private void Awake()
{
//mainCamera = Camera.main; //you wont need this line too
position = this.transform.position;
sRenderer = this.GetComponent<SpriteRenderer>();
}
private void OnEnable() {
CameraPositionChange.camPositionChangeEvent += OnCamPositionChange;
}
private void OnDisable() {
CameraPositionChange.camPositionChangeEvent -= OnCamPositionChange;
}
private void OnCamPositionChange(GameObject go){
transform.LookAt(go.transform); //with this line each item having this script will look at the camera as soon as it's position change
}
}
Hope this helps!
Thank you for your help @mchts It works as I wanted!
You're welcome. Could you please accept the answer as well :)
Save the last position from each frame and check the last position against the current one.
Vector3 oldCamPos;
if(oldCamPos != mainCamera.transform.position) { mainCamera.LookAt(where ever); }
oldCamPos = mainCamera.transform.position;
