private VirtualLight CreateVirtualLight(Light light, int cascade)
{
var hasShadow = light as HasShadow;
var virtualLight = new VirtualLight(light.Color)
{
UseOnlyShadow = true,
DoesCastShadow = true,
ShadowCameraNear = hasShadow.ShadowCameraNear,
ShadowCameraFar = hasShadow.ShadowCameraFar,
ShadowCameraLeft = hasShadow.ShadowCameraLeft,
ShadowCameraRight = hasShadow.ShadowCameraRight,
ShadowCameraBottom = hasShadow.ShadowCameraBottom,
ShadowCameraTop = hasShadow.ShadowCameraTop,
ShadowCameraVisible = hasShadow.ShadowCameraVisible,
ShadowDarkness = hasShadow.ShadowDarkness,
ShadowBias = hasShadow.ShadowCascadeBias[cascade],
ShadowMapWidth = hasShadow.ShadowCascadeWidth[cascade],
ShadowMapHeight = hasShadow.ShadowCascadeHeight[cascade],
PointsWorld = new List<Vector3>(),
PointsFrustum = new List<Vector3>()
};
for (var i = 0; i < 8; i++)
{
virtualLight.PointsWorld.Add(Vector3.Zero);
}
var nearZ = hasShadow.ShadowCascadeNearZ[cascade];
var farZ = hasShadow.ShadowCascadeFarZ[cascade];
virtualLight.PointsFrustum.Add(new Vector3(-1, -1, nearZ));
virtualLight.PointsFrustum.Add(new Vector3(1, -1, nearZ));
virtualLight.PointsFrustum.Add(new Vector3(-1, 1, nearZ));
virtualLight.PointsFrustum.Add(new Vector3(1, 1, nearZ));
virtualLight.PointsFrustum.Add(new Vector3(-1, -1, farZ));
virtualLight.PointsFrustum.Add(new Vector3(1, -1, farZ));
virtualLight.PointsFrustum.Add(new Vector3(-1, 1, farZ));
virtualLight.PointsFrustum.Add(new Vector3(1, 1, farZ));
return virtualLight;
}
// Synchronize virtual light with the original light
private void UpdateVirtualLight(Light light, int cascade)
{
var shadowLight = light as HasShadow;
var hasTarget = light as HasTarget;
var virtualLight = shadowLight.ShadowCascadeArray[cascade];
virtualLight.Position = light.Position;
virtualLight.Target = hasTarget.Target;
virtualLight.LookAt(virtualLight.Target);
virtualLight.ShadowCameraVisible = shadowLight.ShadowCameraVisible;
virtualLight.ShadowDarkness = shadowLight.ShadowDarkness;
virtualLight.ShadowBias = shadowLight.ShadowCascadeBias[cascade];
var nearZ = shadowLight.ShadowCascadeNearZ[cascade];
var farZ = shadowLight.ShadowCascadeFarZ[cascade];
Debug.Assert(virtualLight.PointsFrustum.Count == 8);
for (var p = 0; p < 8; p++)
{
var point = virtualLight.PointsFrustum[p];
point.z = p < 4 ? nearZ : farZ;
virtualLight.PointsFrustum[p] = point;
}
}
private void UpdateShadowCamera(Camera camera, Light light)
{
throw new NotImplementedException();
}