Figure 13
The figure has two panels labeled “(a)” and “(b)”. Panel (a) on the left shows an irregular 3-D block rendered as a gray triangular mesh, with many small facets forming a rough rock‑like shape. The triangles vary in size and shade, creating a faceted surface without any additional markers. Panel (b) on the right is a zoomed‑in view of a sloping portion of a similar gray triangulated surface. Several tall, narrow cones or spikes protrude perpendicularly from the mesh at selected locations. A single blue cone appears near the right edge, and a single large red cone appears near the left edge. These spikes stand out clearly from the gray facets, indicating specific points or measurements on the modeled surface.Mesh representation (a) Complete mesh created from rockbolt surface positions (b) mesh with cones representing rockbolt change