MakeHalfSpace Runtime Error - Only when run on Linux


I am working on a code to use the BRepPrimAPI_MakeHalfSpace command.  It works with Windows 7, but has an error on Linux (CentOS 7.7).  The error is:

Traceback (most recent call last):
  File "", line 10, in <module>
    half_space_obj = BRepPrimAPI_MakeHalfSpace(temp_face, gp_pnt_obj)
  File "./.conda/envs/occt/lib/python3.7/site-packages/OCC/Core/", line 238, in __init__
    _BRepPrimAPI.BRepPrimAPI_MakeHalfSpace_swiginit(self, _BRepPrimAPI.new_BRepPrimAPI_MakeHalfSpace(*args))
RuntimeError: Standard_ConstructionError
gp_Dir() - input vector has zero norm
wrapper details:
  * symname: new_BRepPrimAPI_MakeHalfSpace
  * wrapname: _wrap_new_BRepPrimAPI_MakeHalfSpace__SWIG_0
  * fulldecl: BRepPrimAPI_MakeHalfSpace::BRepPrimAPI_MakeHalfSpace(TopoDS_Face const &,gp_Pnt const &)

The code I am running is:

from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeFace
from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeHalfSpace
from import gp_Pnt, gp_Dir, gp_Pln
gp_pnt_obj = gp_Pnt(0., 0., 0.)
gp_dir_obj = gp_Dir(1, 0, 0)
gp_pln_obj = gp_Pln(gp_pnt_obj, gp_dir_obj)
face_obj = BRepBuilderAPI_MakeFace(gp_pln_obj)
temp_face = face_obj.Face()
half_space_obj = BRepPrimAPI_MakeHalfSpace(temp_face, gp_pnt_obj)
temp_shape = half_space_obj.Shape()

Any help would be greatly appreciated.

Forum supervisor's picture

Hello Cory,

There is a mistake in the input data - the point gp_pnt_obj should not lay on the face temp_face.
This point selects the side of the face that will be the external to the halfspace, so placing it on the face makes such selection ambiguous.

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Forum supervisor

carthur3_154564's picture

Added the point and the vector to get a new point and it worked wonders.

Excellent help!