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lassoan authored
Convenience function useful for retrieving a coordinate system axis from a homogeneous transformation matrix. Also added a few null-pointer checks and warnings to vtkAddonMathUtilities methods. git-svn-id: http://svn.slicer.org/Slicer4/trunk@27249 3bd1e089-480b-0410-8dfb-8563597acbee
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