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Different situation follows when two surfaces (c-housing.stl and c-interface.stl) have their common intersection to be caught. Utility surfaceBooleanFeatures can extract the intersection between two .stl surfaces.
surfaceBooleanFeatures intersection constant/triSurface/c-housing.stl
Several .obj files were created in the case directory. The one we need, to check the result visualy in paraview, is called c-housing_c-interface_intersection_edgeMesh.obj.
We can remove all the unnecessary files then.
rm -rf *.obj
Figure: Edges, compressor wheel and interface.