HTC Vive VR Base Station has what looks like two spinning laser lines
the corrugated or ripple laser lens on the side of rotating drum outputs a sweeping line.
laser beam gos down the middle, axis of the drum. rotating cylinder & mirror.
two spinning laser lines give you X & Y if your motor degrees of rotation is a know value.
by timing your laser lines a 3D space is mapped out. robot eyes
the tools & Bits
quality hand tools gos next to quality test equipment.
a must have. for my bench.