Figure out the unclipped screen location of a 3D point taking into account either a perspective or orthogonal projection. Returns 1 if view is orthogonal or point is visible in 3D view, 0 if invisible in 3D view (behind the viewer). Scale = scale of one world unit (at this point) relative to screen pixels, for example 0.5 means one world unit is 0.5 pixels.
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