Hartmut
95cfe0aa93
- export_step_to_gltf.py: STEP→GLB via RWGltf_CafWriter + BRepBuilderAPI_Transform (mm→m pre-scaling, XCAFDoc_ShapeTool.GetComponents_s static method) - Blender scripts (blender_render.py, still_render.py, turntable_render.py, export_gltf.py, export_blend.py): import GLB instead of STL, remove _scale_mm_to_m - step_tasks.py: add generate_gltf_production_task, remove generate_stl_cache, replace _bbox_from_stl with _bbox_from_glb (trimesh), auto-queue geometry GLB after thumbnail render - render_blender.py: replace _stl_from_cache_or_convert with _glb_from_step, remove convert_step_to_stl and export_per_part_stls - domains/rendering/tasks.py: update render_turntable_task, export_gltf/blend tasks to use GLB instead of STL - cad.py: remove STL download/generate endpoints, add generate-gltf-production - admin.py: generate-missing-stls → generate-missing-geometry-glbs - Frontend: replace STL cache UI with GLB generate buttons, remove stl_cached field Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
"""Blender headless script: export a STEP-derived scene as a production GLB.
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Usage:
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blender --background --python export_gltf.py -- \\
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--stl_path /path/to/file.stl \\
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--output_path /path/to/output.glb \\
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[--asset_library_blend /path/to/library.blend] \\
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[--material_map '{"SrcMat": "LibMat"}']
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The script:
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1. Imports the STL file (with mm→m scale).
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2. Optionally applies asset library materials from a .blend.
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3. Exports as GLB (Draco-compressed if available, otherwise standard).
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"""
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from __future__ import annotations
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import argparse
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import json
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import sys
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import traceback
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def parse_args() -> argparse.Namespace:
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argv = sys.argv
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if "--" not in argv:
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print("No arguments after --", file=sys.stderr)
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sys.exit(1)
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rest = argv[argv.index("--") + 1:]
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parser = argparse.ArgumentParser()
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parser.add_argument("--glb_path", required=True,
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help="Geometry GLB from export_step_to_gltf.py (already in metres)")
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parser.add_argument("--output_path", required=True)
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parser.add_argument("--asset_library_blend", default=None)
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parser.add_argument("--material_map", default="{}")
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return parser.parse_args(rest)
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def main() -> None:
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args = parse_args()
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material_map: dict = json.loads(args.material_map)
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import bpy # type: ignore[import]
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import math as _math
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# Clean scene
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bpy.ops.wm.read_factory_settings(use_empty=True)
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# Import geometry GLB from export_step_to_gltf.py (already in metres, Y-up)
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bpy.ops.import_scene.gltf(filepath=args.glb_path)
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print(f"Imported geometry GLB: {args.glb_path} "
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f"({len([o for o in bpy.data.objects if o.type == 'MESH'])} mesh objects)")
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# Apply smooth shading with 30° angle threshold (Blender 4.1+ API)
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for obj in bpy.data.objects:
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if obj.type == "MESH":
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bpy.context.view_layer.objects.active = obj
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obj.select_set(True)
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try:
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bpy.ops.object.shade_smooth_by_angle(angle=_math.radians(30))
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except Exception:
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pass
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# Apply asset library materials if provided.
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# link=False (append) is required: the GLTF exporter can only traverse
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# local (appended) Principled BSDF node trees to extract PBR values.
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if args.asset_library_blend and material_map:
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import os
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sys.path.insert(0, os.path.dirname(__file__))
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from asset_library import apply_asset_library_materials
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apply_asset_library_materials(args.asset_library_blend, material_map, link=False)
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# Export production GLB with full PBR material data
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try:
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bpy.ops.export_scene.gltf(
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filepath=args.output_path,
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export_format="GLB",
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export_apply=True,
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use_selection=False,
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export_materials="EXPORT",
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export_image_format="AUTO",
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)
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except Exception as exc:
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print(f"GLB export failed: {exc}", file=sys.stderr)
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sys.exit(1)
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print(f"Production GLB exported to {args.output_path}")
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try:
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main()
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except SystemExit:
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raise
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except Exception:
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traceback.print_exc()
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sys.exit(1)
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