nx_silhouette_quality.nx

nx_silhouette_quality.nx -- horizon/skyline quality grader. Per the honest audit 2026-05-16: heightmap statistical graders (nx_world_quality_grader) can return S-class for terrain that nonetheless produces a FLAT-LOOKING HORIZON. This primitive grades the SILHOUETTE -- what you see when you look toward the horizon -- on 5 axes designed to catch "high-stats, low-vista" worlds. Method: from a camera viewpoint, sample N azimuth rays (default 64) around the horizon. For each ray, march outward across the heightmap and find the maximum ANGULAR ELEVATION (apparent height above the camera, projected to a small-angle proxy: elev_proxy = (max_h - cam_y) / dist scaled to Q14). This produces a silhouette of N samples. AXES (Q14 [0, Q]; higher = better skyline): 0. ELEVATION_RANGE: max - min angular elevation across silhouette. Worlds with all peaks at the same apparent height = 0. 1. PEAK_COUNT: local-maxima count; target 3-8 distinct peaks per half-horizon. Catches uniform-tooth-saw silhouettes. 2. SMOOTHNESS: penalty for too-jagged AND too-smooth. Mean abs second-difference compared to target band. 3. ASPECT_DIVERSITY: stddev of peak-to-peak widths. Catches repetitive tooth patterns. 4. SKY_BALANCE: fraction of view that is sky (above horizon proxy threshold); target 0.3 - 0.7. Catches "all mountains" and "all flatland". EMITS LAYER_VERDICT (kind = NX_LAYER_KIND_READABILITY, REFINE_HINT = REFINE_MORE_FEATURES). genealogy_id: appleton_1996_landscape_aesthetics + horizon_silhouette_canon lineage_id: nx_silhouette_quality_5axis_v1