To automatically detect and collapse regions of faces narrower than a specified size, in the Geometry toolbar, from the Virtual Operations menu (), select Collapse Face Regions (). You can also select it from the Geometry node’s context menu’s Virtual Operations submenu. Such narrow regions of faces can cause unwanted mesh refinement or even meshing failure. The collapse face regions operation determines narrow regions of a face and then collapses those resulting sliver faces.

Select the faces for which you want to collapse narrow face regions in the Graphics window. They then appear in the Faces list. If the geometry sequence includes user-defined selections above the Collapse Face Regions node, choose Manual to select faces, or choose one of the selection nodes from the list next to Faces.

Click the Active button to toggle between turning ON and OFF the Faces selections.

By default, the Narrow regions tolerance list is set to Automatic. Select Manual to enter a value in the Maximum width field that appears. The tolerance is the maximum width of a face region to be considered as narrow. If you build the operation with Automatic and then switch to Manual, the Maximum width field shows the value of the parameter that was used when the operation was built.