Hartmut
202b06a026
- Add export_extras=True to bpy.ops.export_scene.gltf() call
- Store schaeffler_sharp_angle_deg in scene custom props before export
→ value is embedded in scenes[0].extras in the GLB JSON chunk
→ survives import/export round-trip intact (verified: 30.0 restored)
- Add tools/restore_sharp_marks.py: companion Blender script that reads
the angle from scene.get("schaeffler_sharp_angle_deg") and re-applies
mark_sharp() + mark_seam() on all mesh objects after GLB import
GLB format cannot store per-edge sharp/seam flags natively; the visual
shading is correct via vertex splits. The extras + restore script give
users the ability to reconstruct Edit Mode markers without a second format.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
47 lines
1.8 KiB
Python
47 lines
1.8 KiB
Python
"""Blender companion script: restore sharp + seam edge marks after importing a production GLB.
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After importing a Schaeffler production GLB in Blender, run this script once via
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the Scripting workspace (Text Editor → Run Script). It reads the sharp angle that
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was baked into the GLB at export time and re-applies mark_sharp() + mark_seam() on
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every mesh object.
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The GLB visual shading already encodes the sharp edges via vertex splits (normals).
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This script restores the blue sharp-crease and red seam markers in Edit Mode for
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further editing in Blender.
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Usage:
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1. File → Import → glTF 2.0 (.glb) — open your production GLB
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2. Open the Scripting workspace
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3. Open this file (Text Editor → Open → restore_sharp_marks.py)
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4. Click Run Script
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"""
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import bpy
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import math
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angle_deg = bpy.context.scene.get("schaeffler_sharp_angle_deg", 30.0)
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smooth_rad = math.radians(float(angle_deg))
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mesh_objects = [o for o in bpy.data.objects if o.type == "MESH"]
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if not mesh_objects:
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print("No mesh objects found in scene.")
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else:
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total_sharp = 0
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bpy.ops.object.select_all(action="DESELECT")
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for obj in mesh_objects:
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bpy.context.view_layer.objects.active = obj
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obj.select_set(True)
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bpy.ops.object.mode_set(mode="OBJECT")
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for poly in obj.data.polygons:
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poly.use_smooth = True
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bpy.ops.object.mode_set(mode="EDIT")
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bpy.ops.mesh.select_all(action="DESELECT")
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bpy.ops.mesh.edges_select_sharp(sharpness=smooth_rad)
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bpy.ops.mesh.mark_sharp()
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bpy.ops.mesh.mark_seam()
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bpy.ops.object.mode_set(mode="OBJECT")
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total_sharp += sum(1 for e in obj.data.edges if e.use_edge_sharp)
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obj.select_set(False)
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print(f"Restored sharp/seam marks at {angle_deg}°: "
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f"{total_sharp} edges across {len(mesh_objects)} objects.")
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