Add Base to Open Mesh

Rhino
,
1

Hey there,

I’ve got an open mesh from a topo file and was hoping to add a rectangular base underneath to show some sections nicely. I see there’s a solution with Grasshopper but I’m not as educated there. Shrinkwrap isn’t able to provide a tight enough solid since I’m working with a complex surface.

Thanks everyone!

2

Is the mesh rectangular? If so:

DupBorder the mesh
ProjectToCPlane a copy - or use SetPt and Z to flatten a copy at the desired z height
Loft between the two curves to make a (complex) polysurface - your vertical sides
Mesh the lofted polysurface
Join the meshed sides with the topo mesh
FillMeshHole to close the bottom.