void UpdateEyeFrustum()
{
if ((dirtyFlags & DirtyFlags.EyeFrustum) != 0)
{
Matrix eyeViewProjection;
Matrix.Multiply(ref eyeView, ref eyeProjection, out eyeViewProjection);
eyeFrustum.Matrix = eyeViewProjection;
dirtyFlags &= ~DirtyFlags.EyeFrustum;
}
}