koobas.hobune.stream
Set a sun light (Day Night Cycle)
Hello,
I want to make a day/night cycle by using the planetay rotaion. Now I have a Problem, the yewllow line in the Screenshot is the Direction to the Star for a Local directional Light
I have trouble with the correct direction of the Local Sun Light.
The Local Directional Light has the script:
using UnityEngine;
using System.Collections;
public class LocalSun : MonoBehaviour
{
public GameObject star;
public GameObject skyBoxCam;
public LayerMask layer;
Light localSun;
void Start ()
{
localSun = light;
}
void Update ()
{
Quaternion starDirection = Quaternion.LookRotation(star.transform.position - skyBoxCam.transform.position);
Vector3 v3LocalStarDirection = starDirection * Vector3.forward;
Debug.DrawRay(skyBoxCam.transform.position, v3LocalStarDirection, Color.yellow);
Debug.DrawRay(skyBoxCam.transform.position, skyBoxCam.transform.forward, Color.blue);
Debug.DrawRay(skyBoxCam.transform.position, skyBoxCam.transform.right, Color.red);
Debug.DrawRay(skyBoxCam.transform.position, skyBoxCam.transform.up, Color.green);
Vector3 v3Relative = skyBoxCam.transform.parent.transform.TransformDirection(v3LocalStarDirection);
Ray ray = new Ray(skyBoxCam.transform.position, starDirection * Vector3.forward);
RaycastHit hit;
if(Physics.Raycast(ray, out hit, 10000f, layer.value))
{
if(hit.transform.light)
{
light.enabled = true;
}
else
{
light.enabled = false;
}
}
Debug.DrawRay(transform.position, v3Relative, Color.white);
transform.rotation = Quaternion.LookRotation(v3Relative);
}
}
The skyBoxCam object is parented to an object to algin it to the planet surface in an easier way.
I think the problem is the way I try to Copy the Direction to the Sun:
Vector3 v3Relative = skyBoxCam.transform.parent.transform.TransformDirection(v3LocalStarDirection);
The Sunlight points in a wrong Direction and can't go under the horizon if I Rotate the Planet (but the Yellow line[direction to the sun] is under the horizon).
I'm sorry for the odd english, I'm not a native speaker.
Now I can fix this by using a relativ roation offset.
using UnityEngine;
using System.Collections;
public class LocalSun : $$anonymous$$onoBehaviour
{
public GameObject star;
public GameObject skyBoxCam;
public Layer$$anonymous$$ask layer;
Light localSun;
void Start ()
{
localSun = light;
}
void Update ()
{
Quaternion starDirection = Quaternion.LookRotation(star.transform.position - skyBoxCam.transform.position);
/*
Vector3 v3LocalStarDirection = starDirection * Vector3.forward;
Debug.DrawRay(skyBoxCam.transform.position, v3LocalStarDirection, Color.yellow);
Debug.DrawRay(skyBoxCam.transform.position, skyBoxCam.transform.forward, Color.blue);
Debug.DrawRay(skyBoxCam.transform.position, skyBoxCam.transform.right, Color.red);
Debug.DrawRay(skyBoxCam.transform.position, skyBoxCam.transform.up, Color.green);
*/
Ray ray = new Ray(skyBoxCam.transform.position, starDirection * Vector3.forward);
RaycastHit hit;
if(Physics.Raycast(ray, out hit, 10000f, layer.value))
{
if(hit.transform.light)
{
light.enabled = true;
}
else
{
light.enabled = false;
}
}
Quaternion offset = Quaternion.Inverse(skyBoxCam.transform.parent.rotation) * starDirection;
Debug.DrawRay(transform.position, offset * Vector3.forward, Color.white);
transform.rotation = offset;
transform.Rotate(0,180,0);
}
}
