Added lens shift functionality to PerspectiveCamera #23
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Implements lens shift support for
PerspectiveCamera.Changes to
PerspectiveCameraNew properties:
lensShiftX: Horizontal lens shift parameter (normalised units)lensShiftY: Vertical lens shift parameter (normalised units)enableFrustumShift: Toggle to enable/disable frustum shift calculationCore functionality:
frustumShiftPerspectiveMatrixf()inSatinCoreto compute off-axis projection matricesHelper methods:
setLensShift(_:_:): Convenience method to set both shift values and auto-enableresetLensShift(): Resets shift values and disables frustum shiftSerialisation:
Codablesupport for the new properties with backward compatibility(Ideally I want to have an equivalent implementation to what
THREE.jsoffers with PerpsectiveCamera.setViewOffset. But for now, lets start at minimum...)