Fixed and improved the STL exporter example, see issue #296

Author: tpaviot

examples/core_export_stl.py

@@ -17,18 +17,38 @@
 
 import os
 from OCC.StlAPI import StlAPI_Writer
-from OCC.BRepPrimAPI import BRepPrimAPI_MakeBox
+from OCC.BRepPrimAPI import BRepPrimAPI_MakeTorus
+from OCC.BRepMesh import BRepMesh_IncrementalMesh
 
-my_box = BRepPrimAPI_MakeBox(10., 20., 30.).Shape()
+# first, create the shape
+my_torus = BRepPrimAPI_MakeTorus(20., 10.).Shape()
+# then mesh it. This mesh is used by the STL exporter
+# Note : if the mesh is not performed, the STL exporter
+# won't do nothing
+mesh = BRepMesh_IncrementalMesh(my_torus, 0.9)
+mesh.Perform()
+assert mesh.IsDone()
 
 # set the directory where to output the
 directory = os.path.split(__name__)[0]
 stl_output_dir = os.path.abspath(os.path.join(directory, "models"))
 
 # make sure the path exists otherwise OCE get confused
 assert os.path.isdir(stl_output_dir)
-stl_output_file = os.path.join(stl_output_dir, "box.stl")
-
+stl_low_resolution_file = os.path.join(stl_output_dir, "torus_low_resolution.stl")
 stl_exporter = StlAPI_Writer()
 stl_exporter.SetASCIIMode(True)  # change to False if you need binary export
-stl_exporter.Write(my_box, stl_output_file)
+stl_exporter.Write(my_torus, stl_low_resolution_file)
+# make sure the program was created
+assert os.path.isfile(stl_low_resolution_file)
+
+# then we change the mesh resolution
+#
+mesh.SetDeflection(0.05)
+mesh.Perform()
+assert mesh.IsDone()
+stl_high_resolution_file = os.path.join(stl_output_dir, "torus_high_resolution.stl")
+# we set the format to binary
+stl_exporter.SetASCIIMode(False)
+stl_exporter.Write(my_torus, stl_high_resolution_file)
+assert os.path.isfile(stl_high_resolution_file)