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Use is not operator rather than not ...is
This is advocated by both PEP8 and the Google Python Style Guide
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@ -493,7 +493,7 @@ class X3DReader(MeshReader):
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# Columns are the unit vectors for the xz plane for the cross-section
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if orient:
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mrot = orient[i] if len(orient) > 1 else orient[0]
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if not mrot is None:
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if mrot is not None:
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m = m.dot(mrot) # Tested against X3DOM, the result matches, still not sure :(
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if scale:
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