/// <summary>
/// Initialize Per frame shadowmap buffers for Shadowmap shader
/// </summary>
public static void UpdateShadowMapState(ref ShadowMapComponent comp, ref ShadowmapSettings settings)
{
Camera shadowCam = comp.shadowCam;
Shader.SetGlobalFloat(ShaderIDs._ShadowCamFarClip, shadowCam.farClipPlane);
Graphics.SetRenderTarget(comp.shadowmapTexture);
GL.Clear(true, true, Color.white);
Shader.SetGlobalVector(ShaderIDs._NormalBiases, settings.normalBias);
Shader.SetGlobalVector(ShaderIDs._ShadowDisableDistance, new Vector4(settings.firstLevelDistance, settings.secondLevelDistance, settings.thirdLevelDistance, settings.farestDistance));
Shader.SetGlobalVector(ShaderIDs._LightDirection, -comp.light.transform.forward);
Shader.SetGlobalVector(ShaderIDs._LightFinalColor, comp.light.color * comp.light.intensity);
Shader.SetGlobalVector(ShaderIDs._SoftParam, settings.cascadeSoftValue / settings.resolution);
}
/// <summary>
/// Set Shadowcamera Position
/// </summary>
/// <param name="shadMap"></param> Shadowmap component
/// <param name="settings"></param> Shadowmap Settings
public static void SetShadowCameraPositionCloseFit(ref ShadowMapComponent shadMap, ref ShadowmapSettings settings)
{
Camera shadowCam = shadMap.shadowCam;
NativeArray <AspectInfo> shadowFrustumPlanes = shadMap.shadowFrustumPlanes;
AspectInfo info = shadowFrustumPlanes[0];
info.planeNormal = shadowCam.transform.right;
shadowFrustumPlanes[0] = info;
info = shadowFrustumPlanes[1];
info.planeNormal = shadowCam.transform.up;
shadowFrustumPlanes[1] = info;
info = shadowFrustumPlanes[2];
info.planeNormal = shadowCam.transform.forward;
shadowFrustumPlanes[2] = info;
for (int i = 0; i < 3; ++i)
{
info = shadowFrustumPlanes[i];
float least = float.MaxValue;
float maximum = float.MinValue;
Vector3 lessPoint = Vector3.zero;
Vector3 morePoint = Vector3.zero;
for (int x = 0; x < 8; ++x)
{
float dotValue = Vector3.Dot(info.planeNormal, shadMap.frustumCorners[x]);
if (dotValue < least)
{
least = dotValue;
lessPoint = shadMap.frustumCorners[x];
}
if (dotValue > maximum)
{
maximum = dotValue;
morePoint = shadMap.frustumCorners[x];
}
}
info.size = (maximum - least) / 2f;
info.inPlanePoint = lessPoint + info.planeNormal * info.size;
shadowFrustumPlanes[i] = info;
}
AspectInfo temp = shadowFrustumPlanes[2];
temp.size = settings.farestDistance; //Farest Cascade Distance
shadowFrustumPlanes[2] = temp;
Transform tr = shadowCam.transform;
for (int i = 0; i < 3; ++i)
{
info = shadowFrustumPlanes[i];
float dist = Vector3.Dot(info.inPlanePoint, info.planeNormal) - Vector3.Dot(tr.position, info.planeNormal);
tr.position += dist * info.planeNormal;
}
shadowCam.orthographicSize = shadowFrustumPlanes[1].size;
shadowCam.aspect = shadowFrustumPlanes[0].size / shadowFrustumPlanes[1].size;
shadowCam.nearClipPlane = 0;
shadowCam.farClipPlane = shadowFrustumPlanes[2].size * 2;
tr.position -= shadowFrustumPlanes[2].size * shadowFrustumPlanes[2].planeNormal;
}