void Update()
{
if (LightCamera == null)
{
LightCamera = CreateDirLightCamera();
}
//check change shadow resolution
if (cachedShadowResolution != shadowResolution)
{
var preTex = LightCamera.targetTexture;
if (!preTex)
{
preTex.Release();
}
LightCamera.targetTexture = Create2DTexture(LightCamera, (int)shadowResolution);
cachedShadowResolution = shadowResolution;
}
LightCamera.transform.position = dirLight.gameObject.transform.position;
LightCamera.transform.rotation = dirLight.gameObject.transform.rotation;
LightCamera.transform.localScale = dirLight.gameObject.transform.localScale;
Shader.SetGlobalFloat("_gShadowBias", ShadowBias);
Matrix4x4 PMatrix = GL.GetGPUProjectionMatrix(LightCamera.projectionMatrix, false); //处理不同平台投影矩阵的差异性
Shader.SetGlobalMatrix("_gWorldToShadow", PMatrix * LightCamera.worldToCameraMatrix); //当前片段从世界坐标转换到光源空间坐标
Shader.SetGlobalFloat("_gShadowStrength", ShadowStrength);
LightCamera.RenderWithShader(ligthCameraShader, ""); //设置深度相机绘制shader为自定义shader
}
void Start()
{
cachedShadowResolution = shadowResolution;
LightCamera = CreateDirLightCamera();
if (!LightCamera.targetTexture)
{
LightCamera.targetTexture = Create2DTexture(LightCamera, (int)shadowResolution);
}
}
