File size: 6,767 Bytes
5154c4e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 | from __future__ import annotations
import os
import struct
from pathlib import Path
OUTPUT_ROOT = Path(os.environ.get("EVAL_OUTPUT_ROOT", "/home/user/Desktop"))
OUTPUT_NAME = "task-038_output.stl"
RIB_CENTERS_X = [-40.0, -20.0, 0.0, 20.0, 40.0]
EXPECTED_BOUNDS = [[-50.0, -30.0, 0.0], [50.0, 30.0, 40.0]]
EXPECTED_VOLUME_MM3 = 52488.706
GEOMETRY_TOL = 0.2
def _parse_stl(path: Path):
data = path.read_bytes()
triangles = []
if len(data) >= 84:
count = struct.unpack("<I", data[80:84])[0]
if 84 + count * 50 == len(data):
for index in range(count):
values = struct.unpack("<12fH", data[84 + index * 50 : 134 + index * 50])
coordinates = values[3:12]
triangles.append(
tuple(
(coordinates[offset], coordinates[offset + 1], coordinates[offset + 2])
for offset in range(0, 9, 3)
)
)
return triangles
vertices = []
for raw_line in data.decode("utf-8", errors="ignore").splitlines():
parts = raw_line.strip().split()
if len(parts) == 4 and parts[0].lower() == "vertex":
vertices.append(tuple(float(value) for value in parts[1:]))
if len(vertices) == 3:
triangles.append(tuple(vertices))
vertices = []
return triangles
def _vertex_key(point):
return tuple(round(float(value), 4) for value in point)
class Mesh:
def __init__(self, triangles):
self.triangles = triangles
unique = {}
for triangle in triangles:
for point in triangle:
unique[_vertex_key(point)] = tuple(float(value) for value in point)
self.vertices = list(unique.values())
self.mins = [min(point[axis] for point in self.vertices) for axis in range(3)]
self.maxs = [max(point[axis] for point in self.vertices) for axis in range(3)]
def _close(actual, expected, tolerance=GEOMETRY_TOL):
return abs(float(actual) - float(expected)) <= tolerance
def _near_vertex(mesh: Mesh, target, tolerance=GEOMETRY_TOL):
return any(
all(abs(point[axis] - target[axis]) <= tolerance for axis in range(3))
for point in mesh.vertices
)
def _cross(first, second):
return (
first[1] * second[2] - first[2] * second[1],
first[2] * second[0] - first[0] * second[2],
first[0] * second[1] - first[1] * second[0],
)
def _signed_volume(mesh: Mesh):
total = 0.0
for a, b, c in mesh.triangles:
cross = _cross(b, c)
total += a[0] * cross[0] + a[1] * cross[1] + a[2] * cross[2]
return total / 6.0
def _topology_ok(mesh: Mesh):
vertex_ids = {}
indexed_faces = []
for triangle in mesh.triangles:
face = []
for point in triangle:
key = _vertex_key(point)
if key not in vertex_ids:
vertex_ids[key] = len(vertex_ids)
face.append(vertex_ids[key])
if len(set(face)) != 3:
return False
indexed_faces.append(face)
parent = list(range(len(indexed_faces)))
def find(item):
while parent[item] != item:
parent[item] = parent[parent[item]]
item = parent[item]
return item
def union(first, second):
root_first, root_second = find(first), find(second)
if root_first != root_second:
parent[root_second] = root_first
edge_owners = {}
for face_index, (a, b, c) in enumerate(indexed_faces):
for edge in ((a, b), (b, c), (c, a)):
key = tuple(sorted(edge))
edge_owners.setdefault(key, []).append(face_index)
if any(len(owners) != 2 for owners in edge_owners.values()):
return False
for owners in edge_owners.values():
union(owners[0], owners[1])
return len({find(index) for index in range(len(indexed_faces))}) == 1
def _ray_hit_x(y, z, triangle):
a, b, c = triangle
v0 = (c[1] - a[1], c[2] - a[2])
v1 = (b[1] - a[1], b[2] - a[2])
v2 = (y - a[1], z - a[2])
denominator = v0[0] * v1[1] - v1[0] * v0[1]
if abs(denominator) < 1e-10:
return None
u = (v2[0] * v1[1] - v1[0] * v2[1]) / denominator
v = (v0[0] * v2[1] - v2[0] * v0[1]) / denominator
if u < -1e-9 or v < -1e-9 or u + v > 1.0 + 1e-9:
return None
return a[0] + u * (c[0] - a[0]) + v * (b[0] - a[0])
def _point_inside(mesh: Mesh, point):
x, y, z = point
hits = []
for triangle in mesh.triangles:
hit = _ray_hit_x(y, z, triangle)
if hit is None or hit <= x + 1e-7:
continue
if all(abs(hit - previous) > 1e-6 for previous in hits):
hits.append(hit)
return len(hits) % 2 == 1
def _rib_ok(mesh: Mesh, center_x):
x_bounds = [center_x - 1.5, center_x + 1.5]
visible_triangle_points = [
(0.875, 5.0),
(25.0, 5.0),
(25.0, 32.5714286),
]
if not all(
_near_vertex(mesh, (x, y, z))
for x in x_bounds
for y, z in visible_triangle_points
):
return False
for y in (5.0, 15.0, 24.0):
slope_top_z = 4.0 + (32.0 / 28.0) * y
for x_offset in (-1.4, 0.0, 1.4):
if not _point_inside(mesh, (center_x + x_offset, y, slope_top_z - 0.3)):
return False
if _point_inside(mesh, (center_x, y, slope_top_z + 0.3)):
return False
thickness_outside_probes = [
(center_x - 1.7, 10.0, 10.0),
(center_x + 1.7, 10.0, 10.0),
]
return not any(_point_inside(mesh, probe) for probe in thickness_outside_probes)
def evaluate() -> bool:
path = OUTPUT_ROOT / OUTPUT_NAME
if not path.is_file() or path.stat().st_size <= 0:
return False
triangles = _parse_stl(path)
if len(triangles) < 40:
return False
mesh = Mesh(triangles)
if len(mesh.vertices) < 24:
return False
if any(
not _close(mesh.mins[axis], EXPECTED_BOUNDS[0][axis])
or not _close(mesh.maxs[axis], EXPECTED_BOUNDS[1][axis])
for axis in range(3)
):
return False
if not _topology_ok(mesh):
return False
if abs(abs(_signed_volume(mesh)) - EXPECTED_VOLUME_MM3) > 8.0:
return False
bracket_solid_probes = [
(0.0, 0.0, 2.5),
(0.0, 27.5, 20.0),
(-49.0, 0.0, 2.5),
(49.0, 27.5, 20.0),
]
if not all(_point_inside(mesh, probe) for probe in bracket_solid_probes):
return False
return all(_rib_ok(mesh, center_x) for center_x in RIB_CENTERS_X)
if __name__ == "__main__":
try:
result = evaluate()
except Exception:
result = False
print("True" if result else "False")
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