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Co-authored-by: Cursor <cursoragent@cursor.com>

Tools/model_tools/bl_trial_studio_bake.py

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+"""Isolated A/B trial of the installed Studio baker; never edits the shared backend.
+
+Blender -- --job DIR --output DIR --ray-mode legacy|adaptive
+Uses the same source geometry and Studio UVs, keeping baked/exported normals consistent.
+"""
+import argparse
+import hashlib
+import json
+import sys
+from pathlib import Path
+
+parser = argparse.ArgumentParser()
+parser.add_argument('--job', required=True)
+parser.add_argument('--output', required=True)
+parser.add_argument('--ray-mode', choices=['legacy', 'adaptive'], default='adaptive')
+args = parser.parse_args(sys.argv[sys.argv.index('--') + 1:])
+job, out = Path(args.job).resolve(), Path(args.output).resolve()
+out.mkdir(parents=True, exist_ok=True)
+backend = Path('D:/UD/AI/XModel/LLM3DGraphics/backend/blender_lowpoly_bake.py')
+source = backend.read_text(encoding='utf-8')
+baseline_hash = hashlib.sha256(backend.read_bytes()).hexdigest()
+needle = 'outward_faces = bias_normals_outward(low)'
+assert source.count(needle) == 1
+source = source.replace(needle, 'outward_faces = 0  # Preserve the same tangent basis used by the normal bake')
+if args.ray_mode == 'adaptive':
+    needle = 'ray = estimate_ray_distance(low)'
+    assert source.count(needle) == 1
+    source = source.replace(needle, '''
+# Trial: surface separation rather than a fixed 4% of the full bounding box.
+_bvh = BVHTree.FromObject(high, bpy.context.evaluated_depsgraph_get())
+_distances = []
+for _poly in low.data.polygons:
+    _hit = _bvh.find_nearest(low.matrix_world @ _poly.center)
+    if _hit[0] is not None:
+        _distances.append(float(_hit[3]))
+_diag = float(low.dimensions.length)
+_p99 = float(np.percentile(_distances, 99))
+ray = min(max(_p99 * 1.5, _diag * .0005), _diag * .01)
+print('TRIAL_PROJECTION ' + json.dumps(dict(p99=_p99, bbox_diagonal=_diag,
+    cage_extrusion=ray, legacy_cage_extrusion=_diag*.04)))
+''')
+sys.argv = [str(backend), '--', str(job/'model.glb'), str(out/'model_baked.glb'),
+            '1', '1024', str(job/'model_lowpoly_uv.glb')]
+(out/'baker_snapshot.py').write_text(source, encoding='utf-8')
+(out/'trial_settings.json').write_text(json.dumps(dict(
+    source_job=str(job), shared_backend_sha256=baseline_hash,
+    ray_mode=args.ray_mode, post_bake_normal_bias=False,
+    preserve_studio_uv=True, source_unchanged=True), indent=2), encoding='utf-8')
+exec(compile(source, str(out/'baker_snapshot.py'), 'exec'),
+     {'__file__': str(backend), '__name__': '__main__'})