create 3d curve or helixhttps://communities.bentley.com/products/microstation/f/microstation-forum/115154/create-3d-curve-or-helixHi all I need to create a ramp between c-c&#39; en d-d&#39;. Same for a-a&#39; and b-b&#39;. To take on example: the radius on c-c&#39; = 325 cm en the height is 350 cm. But the angle between c and c&#39; = 227.8652&#176;. See image below. How to create this 3d curve or helixen-USTelligent Community 12RE: create 3d curve or helixhttps://communities.bentley.com/thread/353273?ContentTypeID=1Mon, 18 Jan 2016 14:57:27 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:e52e9e75-a384-40cf-8f73-76e03758ef60TSLThanks Ron and Jon for replying my question.<br /> I could create my two ramps with the keyin from Ron.<div style="clear:both;"></div>RE: create 3d curve or helixhttps://communities.bentley.com/thread/353182?ContentTypeID=1Sun, 17 Jan 2016 22:31:16 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:6db1861b-ca67-42b6-a3d1-68a3b18ffcfcRon Jones<p>Hi Jean,<br /> You can can use Surface by Extrusion Along. <br />Key-in: CONSTRUCT SURFACE ALONG</p> <p>Just draw your 350 cm vertical axis and line C-D, and set the spin angle to 227.8652. Now extrude line C-D along the vertical axis.<br /> <br /> Cheers,<br /> Ron</p><div style="clear:both;"></div>RE: create 3d curve or helixhttps://communities.bentley.com/thread/353168?ContentTypeID=1Sun, 17 Jan 2016 16:16:41 GMT6dad98f5-dbc9-4c4d-a9ba-e9da8dc6aa8e:a6acd93c-fc67-4fcf-99a8-001f0ea1b41eJon Summers<p>[quote user=&quot;TSL&quot;]How to create this 3d curve or helix?[/quote]</p> <p>Type <em>helix</em> into MicroStation&#39;s help <em>Search</em> tab to see several answers.</p> <p>You can create a helical curve, surface or feature.&nbsp; Key-ins:</p> <ul> <li>CONSTRUCT SURFACE HELICALSURFACE</li> <li>PLACE HELIX</li> <li>MODELER HELIX</li> </ul> <p></p><div style="clear:both;"></div>