ignore "material_allowance" for ContourFollow (for now)

git-svn-id: https://pycam.svn.sourceforge.net/svnroot/pycam/trunk@712 bbaffbd6-741e-11dd-a85d-61de82d9cad9

src/pycam/Toolpath/Generator.py

@@ -146,8 +146,6 @@ def generate_toolpath(model, tool_settings=None,
         # contour model
         trimesh_model = pycam.Geometry.Model.Model()
         contour_model = model
-        # material allowance is ignored for engraving
-        material_allowance = 0
     # create the grid model if requested
     trimesh_models = [trimesh_model]
     if (support_grid_type == "grid") \
@@ -251,6 +249,8 @@ def generate_toolpath(model, tool_settings=None,
     cutter = pycam.Cutters.get_tool_from_settings(tool_settings, cutter_height)
     if isinstance(cutter, basestring):
         return cutter
+    if not path_generator in ("EngraveCutter", "ContourFollow"):
+        # material allowance is not available for these two strategies
         cutter.set_required_distance(material_allowance)
     physics = _get_physics(trimesh_models, cutter, calculation_backend)
     if isinstance(physics, basestring):