https://communities.bentley.com/products/microstation/f/microstation-forum/219890/convert-smart-surface-b-spline-to-a-solidConvert Smart Surface / B-spline to a Solid? I have managed to get a nice-looking helix to represent a threaded bolt. It’s identified as a smart surface from a B-spline. Now I want to merge this with the bolt rod and the hexagon head, both solids. Ofen-USTelligent Community 12https://communities.bentley.com/thread/673443?ContentTypeID=1Thu, 23 Sep 2021 16:26:13 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:c4a89891-8960-41e9-9eaa-21a228dce97bBrien Bastings<p>You may be able to subtract this surface from a larger radius solid cylinder (half space boolean), hard to say without seeing it. Modeling helical threads isn&#39;t really a great idea for memory/display performance though...if you don&#39;t really need this level a detail I&#39;d recommend using a simplified representation.</p> <p>-B</p><div style="clear:both;"></div>https://communities.bentley.com/thread/673431?ContentTypeID=1Thu, 23 Sep 2021 14:38:32 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:e3cf9b2f-4123-4ba4-b230-deb35d0aacd4Barry Lothian<p><a href="https://docs.bentley.com/LiveContent/web/MicroStation%20Help-v13/en/toolConvertToSolid.html">https://docs.bentley.com/LiveContent/web/MicroStation%20Help-v13/en/toolConvertToSolid.html</a></p><div style="clear:both;"></div>