{
 "slug": "tunnel-entrance",
 "triangles": 9692,
 "texture_px": 2048,
 "triangles_light": null,
 "texture_px_light": null,
 "files": {
  "glb": {
   "name": "tunnel-entrance.glb",
   "bytes": 811492
  },
  "blend": {
   "name": "tunnel-entrance.blend",
   "bytes": 706906
  },
  "fbx": {
   "name": "tunnel-entrance.fbx",
   "bytes": 1336172
  },
  "obj": {
   "name": "tunnel-entrance-obj.zip",
   "bytes": 669291
  },
  "usdz": {
   "name": "tunnel-entrance.usdz",
   "bytes": 1236606
  }
 },
 "extras": {
  "license": "CC0-1.0",
  "source": "grab3d.com",
  "dimensions_m": "29.065 x 23.275 x 12.180",
  "triangles": 9692,
  "textures": "PBR 2048px: base color, roughness, metallic, normal (baked)",
  "generator": "Created by grab3d",
  "created": "2026-10-25",
  "real_size": "road tunnel entrance, concrete portal 24 m wide and 8.5 m high, 12.4 m wide segmental arch opening (6.6 m crown), two lanes plus raised walkways, approx. 18 m of road incl. 8 m of tunnel tube",
  "notes": "front faces -Y (road enters towards +Y); tunnel tube is 8 m deep and closed by a dark end wall; emissive ceiling and wall lights, two street lights; no signs, no lettering, no brand; no movable parts",
  "set": "Cozy Buildings Kit"
 },
 "origin": {
  "method": "procedural",
  "detail": "Built procedurally with Blender scripts. The scripts were written with the help of an AI coding assistant. No generative AI model produced the geometry or textures directly.",
  "ai_content": false,
  "ai_assisted_code": true
 }
}