/*! \page double_nodes_control_page Double nodes This mesh quality control highlights the nodes which are coincident with other nodes (within a given tolerance). Distance at which two nodes are considered coincident is defined by "Quality Controls/Double nodes tolerance" preference. \image html double_nodes.png In this picture some nodes are coincident after copying all elements with translation. \sa A sample TUI Script of a \ref tui_double_nodes_control "Double Nodes" filter. */