Add an example loading an stl file using numpy-stl

Author: tpaviot

examples/core_mesh_data_source_numpy_stl.py

@@ -0,0 +1,46 @@
+##Copyright 2024 Thomas Paviot ([email protected])
+##
+##This file is part of pythonOCC.
+##
+##pythonOCC is free software: you can redistribute it and/or modify
+##it under the terms of the GNU Lesser General Public License as published by
+##the Free Software Foundation, either version 3 of the License, or
+##(at your option) any later version.
+##
+##pythonOCC is distributed in the hope that it will be useful,
+##but WITHOUT ANY WARRANTY; without even the implied warranty of
+##MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+##GNU Lesser General Public License for more details.
+##
+##You should have received a copy of the GNU Lesser General Public License
+##along with pythonOCC.  If not, see <http://www.gnu.org/licenses/>.
+
+import os
+
+from OCC.Core.MeshDS import MeshDS_DataSource
+from OCC.Core.MeshVS import *
+
+from OCC.Display.SimpleGui import init_display
+
+import numpy as np
+import stl  # numpy-stl
+
+# load a stl file using numpy-stl
+stl_filename = os.path.join("..", "assets", "models", "fan.stl")
+stl_mesh = stl.mesh.Mesh.from_file(stl_filename)
+vertices = stl_mesh.vectors.reshape(-1, 3)
+faces = np.array(
+    [[i, i + 1, i + 2] for i in range(0, len(vertices), 3)], dtype=np.int32
+)
+
+# create data source
+a_data_source = MeshDS_DataSource(vertices, faces)
+a_mesh_prs = MeshVS_Mesh()
+a_mesh_prs.SetDataSource(a_data_source)
+a_builder = MeshVS_MeshPrsBuilder(a_mesh_prs)
+a_mesh_prs.AddBuilder(a_builder, True)
+
+display, start_display, add_menu, add_function_to_menu = init_display()
+display.Context.Display(a_mesh_prs, True)
+display.FitAll()
+start_display()