// Fit shadow camera's ortho frustum to camera frustum
private void UpdateShadowCamera(Camera camera, VirtualLight light)
{
var min = Vector3.Infinity;
var max = Vector3.NegativeInfinity;
for (var i = 0; i < 8; i++)
{
var p = light.PointsFrustum[i];
Projector.UnprojectVector(p, camera.projectionMatrix, camera.matrixWorld);
p.Apply(light.ShadowCamera.matrixWorldInverse);
min.Min(p);
min.Max(p);
}
var ortho = light.ShadowCamera as OrthographicCamera;
if (ortho != null)
{
ortho.left = min.x;
ortho.right = max.x;
ortho.top = max.y;
ortho.bottom = min.y;
}
else
{
throw new NotImplementedException("Should this just ignore the perspective version?");
}
// can't really fit near/far
//shadowCamera.near = _min.z;
//shadowCamera.far = _max.z;
light.ShadowCamera.UpdateProjectionMatrix();
}
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);
}