Figure 2
The illustration is a monochrome 3-D view of an irregular underground cavity, rendered in a yellowish color. The top and side walls form an arched, dome‑like shape with many rough folds, ridges, and small pits that indicate a natural or blasted rock surface. Numerous small scattered dots overlay the surfaces, suggesting a point‑cloud or mesh representation of scanned data. The lower part of the image is more open, with a recessed central area resembling the floor or entry of the cavern, while rock extends upward on both the left and right sides, framing the opening.2D projection of the point cloud data of the selected region