Adapt the threshold D_max proportionally to range r to remove over-segmentation of distant objects · O(n) · first-quadrant 90° FoV · 1° step scan.
D_max = r·sin(Δθ)/sin(λ−Δθ) + 3σ
First-quadrant 90° FoV · 1° step · the point after the focus point inside the circle = same cluster · outside = breakpoint