Beta
The camera.
Optional vector where the principal point coordinates will be copied.
A vector containing the principal point NDC coordinates.
https://en.wikipedia.org/wiki/Pinhole_camera_model
This point coincides with the principal vanishing point. By default it's located at the image center (NDC coords [0,0]), and the resulting projection is centered or symmetric. But it may be offset (@see THREE.PerspectiveCamera.setViewOffset) for some use cases such as multiview setups (e.g. stereoscopic rendering), resulting in an asymmetric perspective projection.
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Returns the camera's principal point (intersection of principal ray and image plane) in NDC coordinates.