This window lets you clear a boundary condition interactively by creating a 2D polygon in the graphics display. The boundary condition is removed from any nodes or faces that lie within the 2D polygon.
Interactive selection (Apply/Clear) of boundaries is not available when the Shell Thickness plot is active.
Select the boundary condition you want to apply from this pull-down menu.
Close the window with the button, to enter the polygon definition stage.
Select the polygon using Alt+left mouse button. To delete the last polygon point, use Shift+left mouse button. To complete the polygon, use Ctrl+left mouse button.
After completing the polygon, the selected nodes or faces are displayed. Click the button to accept this selection, and apply the boundary condition. At any stage, the button can be used to cancel the process.