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import argparse
import json
import os
import sys
from datetime import datetime, timezone
STEP_OBJECTS = {
"01-foundation": ["heritage.foundation", "heritage.deck"],
"02-frame": [
"heritage.foundation",
"heritage.deck",
"heritage.frame.left",
"heritage.frame.right",
"heritage.spine",
],
"03-cabin": [
"heritage.foundation",
"heritage.deck",
"heritage.frame.left",
"heritage.frame.right",
"heritage.spine",
"heritage.cabin",
"heritage.crossbeam",
],
}
OBJECT_GEOMETRY = {
"heritage.foundation": ((0.0, 0.0, 0.0), (4.8, 0.35, 2.8)),
"heritage.deck": ((0.0, 0.35, 0.0), (4.2, 0.22, 2.3)),
"heritage.frame.left": ((-1.65, 1.35, 0.0), (0.24, 2.0, 2.0)),
"heritage.frame.right": ((1.65, 1.35, 0.0), (0.24, 2.0, 2.0)),
"heritage.spine": ((0.0, 1.45, 0.0), (0.24, 2.2, 1.8)),
"heritage.cabin": ((0.0, 2.15, 0.0), (2.8, 1.1, 1.8)),
"heritage.crossbeam": ((0.0, 2.95, 0.0), (3.3, 0.22, 2.1)),
}
def utc_now():
return datetime.now(timezone.utc).isoformat().replace("+00:00", "Z")
def fail(message, code):
print(message, file=sys.stderr)
raise SystemExit(code)
def clear_scene(bpy):
bpy.ops.wm.read_factory_settings(use_empty=True)
def create_objects(bpy, step_id):
objects = []
for object_id in STEP_OBJECTS[step_id]:
location, dimensions = OBJECT_GEOMETRY[object_id]
bpy.ops.mesh.primitive_cube_add(size=1.0, location=location)
obj = bpy.context.object
obj.name = object_id
obj.data.name = object_id + ".mesh"
obj.dimensions = dimensions
bpy.context.view_layer.objects.active = obj
bpy.ops.object.transform_apply(location=False, rotation=False, scale=True)
obj["object_id"] = object_id
objects.append(obj)
for obj, object_id in zip(objects, STEP_OBJECTS[step_id]):
if obj.get("object_id") != object_id:
fail("source object custom property verification failed", 4)
return objects
def add_render_setup(bpy):
from mathutils import Vector
scene = bpy.context.scene
scene.render.resolution_x = 512
scene.render.resolution_y = 512
scene.render.resolution_percentage = 100
scene.render.image_settings.file_format = "PNG"
if scene.world is None:
scene.world = bpy.data.worlds.new("fixture.world")
scene.world.color = (0.025, 0.035, 0.045)
camera_data = bpy.data.cameras.new("fixture.camera")
camera = bpy.data.objects.new("fixture.camera", camera_data)
bpy.context.collection.objects.link(camera)
camera.location = (7.5, -9.0, 6.5)
camera.rotation_euler = (Vector((0.0, 1.0, 0.0)) - camera.location).to_track_quat("-Z", "Y").to_euler()
camera_data.lens = 52
scene.camera = camera
light_data = bpy.data.lights.new("fixture.key", type="AREA")
light_data.energy = 900
light_data.shape = "DISK"
light_data.size = 5.0
light = bpy.data.objects.new("fixture.key", light_data)
bpy.context.collection.objects.link(light)
light.location = (4.0, -4.0, 8.0)
light.rotation_euler = (Vector((0.0, 1.0, 0.0)) - light.location).to_track_quat("-Z", "Y").to_euler()
def export_glb(bpy, objects, output):
for obj in bpy.context.selected_objects:
obj.select_set(False)
for obj in objects:
obj.select_set(True)
bpy.context.view_layer.objects.active = objects[-1]
result = bpy.ops.export_scene.gltf(filepath=output, export_format="GLB", use_selection=True)
if "FINISHED" not in result or not os.path.isfile(output) or os.path.getsize(output) <= 0:
fail("GLB export failed", 4)
def write_result(path, response):
path = os.path.abspath(path)
os.makedirs(os.path.dirname(path), exist_ok=True)
temporary_path = path + ".tmp"
with open(temporary_path, "w", encoding="utf-8") as stream:
json.dump(response, stream, separators=(",", ":"))
stream.flush()
os.fsync(stream.fileno())
os.replace(temporary_path, path)
def verify_reimport(bpy, output, expected):
clear_scene(bpy)
result = bpy.ops.import_scene.gltf(filepath=output)
if "FINISHED" not in result:
fail("GLB reimport failed", 4)
names = [obj.name for obj in bpy.context.scene.objects if obj.type == "MESH"]
if len(names) != len(expected) or set(names) != set(expected):
fail("GLB reimport object IDs did not match", 4)
return [object_id for object_id in expected if object_id in names]
def main():
parser = argparse.ArgumentParser(add_help=False)
parser.add_argument("--step-id", required=True)
parser.add_argument("--output", required=True)
parser.add_argument("--render-output")
parser.add_argument("--result-output", required=True)
args = parser.parse_args()
if args.step_id not in STEP_OBJECTS:
fail("unknown step id", 2)
if bool(args.render_output) and os.path.abspath(args.render_output) == os.path.abspath(args.output):
fail("render output must differ from GLB output", 2)
try:
import bpy
except Exception as exc:
fail("bpy is unavailable: " + str(exc), 3)
if tuple(bpy.app.version) < (3, 0, 0):
fail("bpy version is unsupported", 3)
output = os.path.abspath(args.output)
result_output = os.path.abspath(args.result_output)
os.makedirs(os.path.dirname(output), exist_ok=True)
try:
clear_scene(bpy)
objects = create_objects(bpy, args.step_id)
export_glb(bpy, objects, output)
exported_at = utc_now()
glb_bytes = os.path.getsize(output)
rendered_at = None
if args.render_output:
render_output = os.path.abspath(args.render_output)
os.makedirs(os.path.dirname(render_output), exist_ok=True)
add_render_setup(bpy)
bpy.context.scene.render.filepath = render_output
result = bpy.ops.render.render(write_still=True)
if "FINISHED" not in result or not os.path.isfile(render_output) or os.path.getsize(render_output) <= 0:
fail("PNG render failed", 4)
rendered_at = utc_now()
verified = verify_reimport(bpy, output, STEP_OBJECTS[args.step_id])
response = {
"ok": True,
"blenderVersion": ".".join(str(part) for part in bpy.app.version),
"exportedAt": exported_at,
"objectIds": STEP_OBJECTS[args.step_id],
"verifiedObjectIds": verified,
"glbBytes": glb_bytes,
}
if args.render_output:
response["renderPath"] = os.path.abspath(args.render_output)
response["renderedAt"] = rendered_at
write_result(result_output, response)
print("fixture result written: " + result_output)
except SystemExit:
raise
except Exception as exc:
fail("fixture failed: " + str(exc), 4)
if __name__ == "__main__":
main()
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