Creating a Shelled Body from Complex Closed Polysurface

Rhino
, , ,
1

Hi All,

I have a closed polysurface which is rather complex. I would like to remove the top two faces (shown in pink) and shell the rest of the body with a thickness of approximately 1/4"-1/2".

Annotated Image
Closed Polysurface

I have tried offsetsrf and shell commands with no success.

The file is located here; Cathedral.3dm - Google Drive

Thank you for your help.

2

What is this to be used for. I found that shelling the mesh was easiest to a think solid.

image
image1045×690 60.5 KB

Steps i took are:

  1. Extract surface to remove the faces.
  2. Extract Render mesh to get the mesh.
  3. Offset mesh with Solid option.
  4. Then if we want it a NUBS solid use TONurbs on it.
    Cathedral_SD.3dm (215.4 KB)