// Use this for initialization
void Start()
{
GameObject prefabObj = Resources.Load("ActorShadowMap") as GameObject;
GameObject go = GameObject.Instantiate(prefabObj) as GameObject;
OrthographicShadowMap shadowProjector = go.GetComponent <OrthographicShadowMap>();
if (shadowProjector != null)
{
Vector3 lightDir = new Vector3(-24.0f, 24.56f, -27.76f);
//Vector3 lightDir = new Vector3(31.479f,42.816f,25.819f);
Vector3 center = new Vector3(2, 2, 2);
Vector3 size = new Vector3(10, 10, 10);
Bounds shadowBound = new Bounds(center, size);
if (shadowProjector.shadowType == ShadowsType.ProjectorShadow)
{
SetMainCityShadowSetting(lightDir, shadowProjector.GetComponent <Camera>(), shadowBound, GetComponent <Camera>());
}
else if (shadowProjector.shadowType == ShadowsType.ShadowMap)
{
SetMainCityShadowSetting(lightDir, shadowProjector.GetComponentInChildren <Camera>(), shadowBound, GetComponent <Camera>(), shadowProjector);
}
}
}
private void SetMainCityShadowSetting(Vector3 rotation, Camera projCamera, Bounds bound, Camera mainCamera, OrthographicShadowMap obj = null)
{
Vector3 preMainPos = mainCamera.transform.position;
mainCamera.transform.position = new Vector3(bound.center.x, preMainPos.y, preMainPos.z);
projCamera.transform.rotation = Quaternion.Euler(rotation.x, rotation.y, 0);
projCamera.transform.position = bound.center;
Matrix4x4 worldToMainCamera = mainCamera.transform.worldToLocalMatrix;
Matrix4x4 mainCameraToWorld = worldToMainCamera.inverse;
List <Vector3> boundsFourUpPoints = new List <Vector3>();
//左上
boundsFourUpPoints.Add(bound.center + new Vector3(bound.size.x / 2, 0, -bound.size.z / 2));
//右上
boundsFourUpPoints.Add(bound.center + new Vector3(-bound.size.x / 2, 0, -bound.size.z / 2));
//左下
boundsFourUpPoints.Add(bound.center + new Vector3(bound.size.x / 2, 0, bound.size.z / 2));
//右下
boundsFourUpPoints.Add(bound.center + new Vector3(-bound.size.x / 2, 0, bound.size.z / 2));
float r = (mainCamera.fieldOfView / 180f) * Mathf.PI;
Vector3 tempVec = Vector3.zero;
float z = 0;
float xMax = 0;
float yMax = 0;
float x = 0;
float y = 0;
for (int i = 0; i < boundsFourUpPoints.Count; i++)
{
tempVec = boundsFourUpPoints[i];
//将包围盒四个顶点转换到主摄像机空间
boundsFourUpPoints[i] = worldToMainCamera.MultiplyPoint(tempVec);
//计算该点z对用主摄像机xy范围
tempVec = boundsFourUpPoints[i];
z = tempVec.z;
x = tempVec.x;
y = tempVec.y;
yMax = Mathf.Abs(Mathf.Tan(r / 2) * z);
xMax = mainCamera.aspect * yMax;
if (Mathf.Abs(x) > xMax)
{
x = x / Mathf.Abs(x) * xMax;
}
if (Mathf.Abs(y) > yMax)
{
y = y / Mathf.Abs(y) * yMax;
}
tempVec.x = x;
tempVec.y = y;
//在转换为世界坐标
boundsFourUpPoints[i] = mainCameraToWorld.MultiplyPoint(tempVec);
}
Matrix4x4 worldToProjCamera = projCamera.transform.worldToLocalMatrix;
//转换到投影空间设置投影相机size
for (int i = 0; i < boundsFourUpPoints.Count; i++)
{
boundsFourUpPoints[i] = worldToProjCamera.MultiplyPoint(boundsFourUpPoints[i]);
}
float xMin = boundsFourUpPoints[0].x;
xMax = boundsFourUpPoints[0].x;
float yMin = boundsFourUpPoints[0].y;
yMax = boundsFourUpPoints[0].y;
for (int i = 0; i < boundsFourUpPoints.Count; i++)
{
if (boundsFourUpPoints[i].x < xMin)
{
xMin = boundsFourUpPoints[i].x;
}
else if (boundsFourUpPoints[i].x > xMax)
{
xMax = boundsFourUpPoints[i].x;
}
if (boundsFourUpPoints[i].y < yMin)
{
yMin = boundsFourUpPoints[i].y;
}
else if (boundsFourUpPoints[i].y > yMax)
{
yMax = boundsFourUpPoints[i].y;
}
}
projCamera.orthographicSize = (yMax - yMin) > (xMax - xMin) ? (yMax - yMin) / 2 : (xMax - xMin) / 2;
projCamera.transform.position -= projCamera.transform.forward.normalized * 10;
if (obj != null)
{
projCamera.transform.parent = obj.transform;
}
mainCamera.transform.position = preMainPos;
}
