Fr0zkaandClaude Opus 5.5
34ae1d7187
Not for assembler/world: the 8 m -> 4 m strate chunk change moves every stratum, so the SurfaceWorld spawn camera floats in a void and the L1 mesh export shrank 58.7 -> 31.7 MB. Kept for its diagnostics, the boundarySeal finding and the readable capture shading. See Linux17/REPORT.md. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01CSFYgsdW8ejZSyiMf4qRSX
152 lines
6.8 KiB
Python
152 lines
6.8 KiB
Python
#!/usr/bin/env python3
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"""Compare upward mesh heights on shared XY edges between adjacent LOD rings."""
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import array
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import collections
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import math
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import struct
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import sys
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def read_scene(path):
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tiles = []
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with open(path, "rb") as f:
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if f.read(8) != b"VFMSH001":
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raise SystemExit(f"{path}: invalid mesh header")
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version, voxel_um, count = struct.unpack("<3I", f.read(12))
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camera = struct.unpack("<3d", f.read(24))
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yaw, pitch = struct.unpack("<2d", f.read(16))
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voxel_m = voxel_um / 1_000_000.0
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for _ in range(count):
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key = struct.unpack("<4i", f.read(16))
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surface_vertices, skirt_count, vertex_count, index_count, mask_count = struct.unpack(
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"<5I", f.read(20))
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positions = array.array("f")
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positions.frombytes(f.read(vertex_count * 12))
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normals = array.array("f")
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normals.frombytes(f.read(vertex_count * 12))
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indices = array.array("I")
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indices.frombytes(f.read(index_count * 4))
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masks = f.read(mask_count)
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if sys.byteorder != "little":
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positions.byteswap(); normals.byteswap(); indices.byteswap()
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triangles = []
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for i in range(0, index_count, 3):
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if masks and masks[i // 3] != 0:
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continue
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a, b, c = indices[i:i + 3]
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if max(a, b, c) >= surface_vertices:
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continue
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nz = (normals[a * 3 + 2] + normals[b * 3 + 2] + normals[c * 3 + 2]) / 3.0
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if nz < 0.65:
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continue
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tri = tuple((positions[j * 3], positions[j * 3 + 1], positions[j * 3 + 2])
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for j in (a, b, c))
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triangles.append(tri)
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if triangles:
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lod = key[3]
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extent = 32 * (1 << lod) * voxel_m
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tiles.append({"key": key, "lod": lod, "extent": extent,
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"x0": key[0] * extent, "y0": key[1] * extent,
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"x1": (key[0] + 1) * extent, "y1": (key[1] + 1) * extent,
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"z0": key[2] * extent, "z1": (key[2] + 1) * extent,
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"triangles": triangles})
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return camera, yaw, pitch, tiles
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def height_at(tile, x, y):
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best = None
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for tri in tile["triangles"]:
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(x0, y0, z0), (x1, y1, z1), (x2, y2, z2) = tri
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den = (y1 - y2) * (x0 - x2) + (x2 - x1) * (y0 - y2)
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if abs(den) < 1.0e-10:
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continue
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a = ((y1 - y2) * (x - x2) + (x2 - x1) * (y - y2)) / den
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b = ((y2 - y0) * (x - x2) + (x0 - x2) * (y - y2)) / den
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c = 1.0 - a - b
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if min(a, b, c) >= -1.0e-5:
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z = a * z0 + b * z1 + c * z2
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if best is None or z > best:
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best = z
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return best
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path = sys.argv[1]
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camera, yaw, pitch, tiles = read_scene(path)
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by_lod = collections.defaultdict(list)
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for tile in tiles:
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by_lod[tile["lod"]].append(tile)
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print(f"scene={path} camera_m={camera} yaw={yaw} pitch={pitch} nonempty_mesh_tiles={len(tiles)}")
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print("lod_pair shared_edges samples_both median_abs_cm p95_abs_cm max_abs_cm median_delta_cm gaps")
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for lod in range(8):
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fine = by_lod[lod]
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coarse = by_lod[lod + 1]
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deltas = []
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edge_rows = []
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edge_count = 0
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gap_count = 0
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# Shared XY edges occur only where tile extents touch and overlap on the other axis.
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for a in fine:
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for b in coarse:
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zlo, zhi = max(a["z0"], b["z0"]), min(a["z1"], b["z1"])
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if zhi - zlo <= 1.0e-4:
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continue
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edge = None
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if abs(a["x1"] - b["x0"]) < 1.0e-4 or abs(b["x1"] - a["x0"]) < 1.0e-4:
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lo, hi = max(a["y0"], b["y0"]), min(a["y1"], b["y1"])
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if hi - lo > 1.0e-4:
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edge = ("x", a["x1"] if abs(a["x1"] - b["x0"]) < 1.0e-4 else a["x0"], lo, hi)
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if edge is None and (abs(a["y1"] - b["y0"]) < 1.0e-4 or abs(b["y1"] - a["y0"]) < 1.0e-4):
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lo, hi = max(a["x0"], b["x0"]), min(a["x1"], b["x1"])
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if hi - lo > 1.0e-4:
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edge = ("y", a["y1"] if abs(a["y1"] - b["y0"]) < 1.0e-4 else a["y0"], lo, hi)
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if edge is None:
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continue
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edge_count += 1
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axis, fixed, lo, hi = edge
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epsilon = min(0.02, a["extent"] * 0.001, b["extent"] * 0.001)
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samples = 9
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matched = 0
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edge_deltas = []
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for i in range(samples):
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t = (i + 0.5) / samples
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varying = lo + (hi - lo) * t
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if axis == "x":
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side_a = 1.0 if abs(a["x1"] - fixed) < 1.0e-4 else -1.0
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side_b = 1.0 if abs(b["x1"] - fixed) < 1.0e-4 else -1.0
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za = height_at(a, fixed - side_a * epsilon, varying)
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zb = height_at(b, fixed - side_b * epsilon, varying)
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else:
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side_a = 1.0 if abs(a["y1"] - fixed) < 1.0e-4 else -1.0
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side_b = 1.0 if abs(b["y1"] - fixed) < 1.0e-4 else -1.0
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za = height_at(a, varying, fixed - side_a * epsilon)
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zb = height_at(b, varying, fixed - side_b * epsilon)
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if za is not None and not zlo - 1.0e-3 <= za <= zhi + 1.0e-3:
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za = None
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if zb is not None and not zlo - 1.0e-3 <= zb <= zhi + 1.0e-3:
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zb = None
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if za is not None and zb is not None:
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delta = (za - zb) * 100.0
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deltas.append(delta)
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edge_deltas.append((delta, za, zb, varying))
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matched += 1
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if matched == 0:
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gap_count += 1
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elif edge_deltas:
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edge_rows.append((max(abs(row[0]) for row in edge_deltas),
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a["key"], b["key"], edge, edge_deltas))
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if deltas:
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absolute = sorted(abs(x) for x in deltas)
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signed = sorted(deltas)
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p95 = absolute[math.floor(0.95 * (len(absolute) - 1))]
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median_abs = absolute[len(absolute) // 2]
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median_delta = signed[len(signed) // 2]
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print(f"{lod}->{lod+1} {edge_count} {len(deltas)} {median_abs:.3f} {p95:.3f} {max(absolute):.3f} {median_delta:.3f} {gap_count}")
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for worst, fine_key, coarse_key, edge, rows in sorted(edge_rows, reverse=True)[:2]:
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row = max(rows, key=lambda item: abs(item[0]))
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print(f" worst_edge max_abs_cm={worst:.3f} fine={fine_key} coarse={coarse_key} "
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f"axis={edge[0]} fixed_m={edge[1]:.3f} span_m={edge[2]:.3f}..{edge[3]:.3f} "
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f"sample_v_m={row[3]:.3f} fine_z_m={row[1]:.3f} "
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f"coarse_z_m={row[2]:.3f} delta_cm={row[0]:.3f}")
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else:
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print(f"{lod}->{lod+1} {edge_count} 0 n/a n/a n/a n/a {gap_count}")
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