To create surface from sub-mesh, although user can select a sub-mesh by polyline in shell selection panel and create a surface from the selected sub-mesh directly, it seems difficult to get a surface with smooth boundary line since the selected sub-mesh boundary is often zig-zag. The following two pictures shows the sub-mesh and surface with zig-zag boundary line.
surface with zig-zag boundary In order to avoid this zig-zag boundary line, we add a new checkbox Boundary curve for surface in the dialog panel. This checkbox let user select a boundary loop to define a sub-mesh and keep the surface boundary line smooth.
Open the demo file chest_submesh.proj , you will see the mesh model displaying in LSPP mainpage. Click the menu button Geometry->Surface->Fit from pnts/mesh . Select option Surface by Mesh . Click checkbox Mesh to select the whole mesh model by selecting ByPart radio. Click checkbox Boundary curves for surface to select the curves.
select sub-mesh
Click checkbox Untrimmed boundary and set it to be checked. Click button Preview , a surface created.
preview untrimmed surface
Click button Apply. The surface is added to database.
untrimmed surface