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0_glb_to_obj.py

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+import bpy
+import sys
+import os
+import argparse
+
+glb_input = "trellis_out/sample.ply"
+obj_output = "obj_output/sample.obj"
+
+
+def parse_args():
+    argv = sys.argv
+    argv = argv[argv.index("--") + 1:] if "--" in argv else []
+    p = argparse.ArgumentParser()
+    p.add_argument("-i", "--input", default=True)
+    p.add_argument("-o", "--output", required=True)
+    return p.parse_args(argv)
+
+
+def clean():
+    bpy.ops.object.select_all(action='SELECT')
+    bpy.ops.object.delete(use_global=False)
+
+
+def main():
+    args = parse_args()
+    clean()
+
+    bpy.ops.import_scene.gltf(filepath=args.input)  # 支持 .glb/.gltf
+
+    # 只保留 mesh，并合并成一个（符合你“单资产”假设）
+    meshes = [o for o in bpy.context.scene.objects if o.type == "MESH"]
+    if not meshes:
+        raise RuntimeError("No mesh objects found in GLB/GLTF.")
+    bpy.ops.object.select_all(action='DESELECT')
+    for o in meshes:
+        o.select_set(True)
+    bpy.context.view_layer.objects.active = meshes[0]
+    if len(meshes) > 1:
+        bpy.ops.object.join()
+
+    obj = bpy.context.view_layer.objects.active
+    obj.select_set(True)
+
+    out_dir = os.path.dirname(args.output)
+    if out_dir:
+        os.makedirs(out_dir, exist_ok=True)
+
+    # bpy.ops.wm.obj_export(
+    #     filepath=args.output,
+    #     export_selected_objects=True,
+    #     export_normals=True,
+    #     export_uv=True,
+    # )
+
+    bpy.ops.export_scene.obj(
+        filepath=args.output,
+        use_selection=True,  # 只导出选中的对象
+        use_normals=True,
+        use_uvs=True,
+        use_materials=True,  # 根据需要改（你原来没导出材质）
+        axis_forward='-Z',  # glTF 通常是 -Z forward，Y up，可根据需要调整
+        axis_up='Y',
+        # keep_vertex_order=True,    # 可选：保持顶点顺序
+    )
+
+
+if __name__ == "__main__":
+    main()