MAX_SECTION_PLANES: 8

Maximum number of section (clipping) planes that can be active in a single View. Baked into the fragment shader as a compile-time MAX_SECTION_PLANES constant so the program never recompiles when planes are created or destroyed at runtime; the renderer just updates uSectionPlaneCount + the uSectionPlanes[] array contents per frame.

Pick a number that covers worst-case engineering review — one cut-away plus two cross sections plus a few clipping volumes ≈ 8 is generous. Bumping it later is a one-line change here plus the GLSL constant.