def selectionCorners(self):
        """ returns the positions of the two selection corners as a pair of 3-tuples, each ordered x,y,z """

        if (None != self.editor.selectionTool.bottomLeftPoint and
                    None != self.editor.selectionTool.topRightPoint):
            return (self.editor.selectionTool.bottomLeftPoint,
                    self.editor.selectionTool.topRightPoint)

        return None
 returns the positions of the two selection corners as a pair of 3-tuples, each ordered x,y,z 
editortools/editortool.py