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    <title>tema Re: Sweep a handrail profile along an irregular helical curve in 3D? en AutoCAD Forum</title>
    <link>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10945871#M1072849</link>
    <description>&lt;P&gt;To get good control on twist I would use LOFT for curved sections of the railing,&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;For my first attempt at a 90° rising corner I used 4 cross sections.&amp;nbsp; I copied a cross section from the end of the bottom straight railing and then rotated it by 30° about the world Z axis. The 3rd section was rotated by 60°. The section for the beginning of the top straight section was rotated 90°.&amp;nbsp;&lt;/P&gt;&lt;P&gt;Note, the magenta line is a spline that was constructed using the CV method ensuring that the slope of the curve was tangent at the two ends to the straight railings to which they mate.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_0-1644619048279.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024244i4CB5B51BB1FA214A/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_0-1644619048279.png" alt="leeminardi_0-1644619048279.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_1-1644619089028.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024245i358ED217A90D5B1E/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_1-1644619089028.png" alt="leeminardi_1-1644619089028.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;I did not like the result as the there was an undesirable twist/bulge midway through the curve which you can see better in the image below.&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_2-1644619352319.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024246i3D174385767968F1/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_2-1644619352319.png" alt="leeminardi_2-1644619352319.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;To correct this I rotated the 2nd and 3rd sections about their local Z axis. To gauge the amount of rotation I created construction lines from the top center of each straight railings (red lines) then used these to create a smooth spline (white) with CVs at each end and one at the intersection of the two red lines.&amp;nbsp; Using these 3 CVs ensured slope tangency at the ends. Using UCS OBject I could then use 2D rotate and adjust the rotation until the top center of the cross section was by the top magenta spline.&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_3-1644619767366.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024249i53DE93C212172875/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_3-1644619767366.png" alt="leeminardi_3-1644619767366.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_4-1644619809386.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024250iB10FC33D404E0ED4/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_4-1644619809386.png" alt="leeminardi_4-1644619809386.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;Note, I tried using sweep with guides and paths but could not get much control of the twist or teeter.&amp;nbsp; &amp;nbsp;I think lofting is the best approach.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_0-1644620359670.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024252i7FBDD3A49631AD90/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_0-1644620359670.png" alt="leeminardi_0-1644620359670.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;</description>
    <pubDate>Fri, 11 Feb 2022 22:59:23 GMT</pubDate>
    <dc:creator>leeminardi</dc:creator>
    <dc:date>2022-02-11T22:59:23Z</dc:date>
    <item>
      <title>Sweep a handrail profile along an irregular helical curve in 3D?</title>
      <link>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10945663#M1072838</link>
      <description>&lt;P&gt;Hello all I am in the custom iron railing business and would like to provide my client with a 3d rendering of what the railing return will look like at a landing. The shape will be a helix similar to a volute and retain the handrail section profile's vertical orientating (no banking or twisting or tilting along the path. I have been successful in the past, but only with a simple rectangle, by creating a mesh between two legitimate helixes and press pulling or extruding that. This is something I will need to know going forward, having a method of accurately creating these 3d renders in such a way I could use them for shop and installation drawings as well.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;I am trying to replicate a shape like this...&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture1.JPG" style="width: 557px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024202i43535BBAE8C085B0/image-size/large?v=v2&amp;amp;px=999" role="button" title="Capture1.JPG" alt="Capture1.JPG" /&gt;&lt;/span&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;This is what I keep having happen when I do get a successful sweep. This was broken up into three parts.&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Capture.JPG" style="width: 999px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024201i39BFA5040C140A05/image-size/large?v=v2&amp;amp;px=999" role="button" title="Capture.JPG" alt="Capture.JPG" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;Anything you have or commands to try would be very much appreciated. This is my first post on the CAD forum, but I am stumped. Thank you&lt;/P&gt;</description>
      <pubDate>Fri, 11 Feb 2022 20:41:39 GMT</pubDate>
      <guid>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10945663#M1072838</guid>
      <dc:creator>JustinDT47Q</dc:creator>
      <dc:date>2022-02-11T20:41:39Z</dc:date>
    </item>
    <item>
      <title>Re: Sweep a handrail profile along an irregular helical curve in 3D?</title>
      <link>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10945700#M1072839</link>
      <description>&lt;P&gt;&lt;STRONG&gt;Extrude / Path&lt;/STRONG&gt; is a good start. Your geometry must be a close polyline to extrude along a path and rotated in the axis of extrusion. Have a look at the attached dwg.&lt;/P&gt;</description>
      <pubDate>Fri, 11 Feb 2022 20:54:30 GMT</pubDate>
      <guid>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10945700#M1072839</guid>
      <dc:creator>dany_rochefort</dc:creator>
      <dc:date>2022-02-11T20:54:30Z</dc:date>
    </item>
    <item>
      <title>Re: Sweep a handrail profile along an irregular helical curve in 3D?</title>
      <link>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10945871#M1072849</link>
      <description>&lt;P&gt;To get good control on twist I would use LOFT for curved sections of the railing,&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;For my first attempt at a 90° rising corner I used 4 cross sections.&amp;nbsp; I copied a cross section from the end of the bottom straight railing and then rotated it by 30° about the world Z axis. The 3rd section was rotated by 60°. The section for the beginning of the top straight section was rotated 90°.&amp;nbsp;&lt;/P&gt;&lt;P&gt;Note, the magenta line is a spline that was constructed using the CV method ensuring that the slope of the curve was tangent at the two ends to the straight railings to which they mate.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_0-1644619048279.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024244i4CB5B51BB1FA214A/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_0-1644619048279.png" alt="leeminardi_0-1644619048279.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_1-1644619089028.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024245i358ED217A90D5B1E/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_1-1644619089028.png" alt="leeminardi_1-1644619089028.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;I did not like the result as the there was an undesirable twist/bulge midway through the curve which you can see better in the image below.&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_2-1644619352319.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024246i3D174385767968F1/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_2-1644619352319.png" alt="leeminardi_2-1644619352319.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;To correct this I rotated the 2nd and 3rd sections about their local Z axis. To gauge the amount of rotation I created construction lines from the top center of each straight railings (red lines) then used these to create a smooth spline (white) with CVs at each end and one at the intersection of the two red lines.&amp;nbsp; Using these 3 CVs ensured slope tangency at the ends. Using UCS OBject I could then use 2D rotate and adjust the rotation until the top center of the cross section was by the top magenta spline.&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_3-1644619767366.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024249i53DE93C212172875/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_3-1644619767366.png" alt="leeminardi_3-1644619767366.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_4-1644619809386.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024250iB10FC33D404E0ED4/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_4-1644619809386.png" alt="leeminardi_4-1644619809386.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;Note, I tried using sweep with guides and paths but could not get much control of the twist or teeter.&amp;nbsp; &amp;nbsp;I think lofting is the best approach.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="leeminardi_0-1644620359670.png" style="width: 400px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1024252i7FBDD3A49631AD90/image-size/medium?v=v2&amp;amp;px=400" role="button" title="leeminardi_0-1644620359670.png" alt="leeminardi_0-1644620359670.png" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Fri, 11 Feb 2022 22:59:23 GMT</pubDate>
      <guid>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10945871#M1072849</guid>
      <dc:creator>leeminardi</dc:creator>
      <dc:date>2022-02-11T22:59:23Z</dc:date>
    </item>
    <item>
      <title>Re: Sweep a handrail profile along an irregular helical curve in 3D?</title>
      <link>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10952870#M1073035</link>
      <description>&lt;P&gt;Do you have a plan and elevation view of the stairway as well as a cross-section of the railing you could post?&lt;/P&gt;</description>
      <pubDate>Wed, 16 Feb 2022 01:06:43 GMT</pubDate>
      <guid>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10952870#M1073035</guid>
      <dc:creator>Washingtonn</dc:creator>
      <dc:date>2022-02-16T01:06:43Z</dc:date>
    </item>
    <item>
      <title>Re: Sweep a handrail profile along an irregular helical curve in 3D?</title>
      <link>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10954815#M1073115</link>
      <description>&lt;P&gt;Using loft with one guide will resolve the roll problem. In my drawing I ran two lofts and then joined them using union. The first loft is at the base and the second is the long run. dwg is attached.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Screenshot 2022-02-16 100729.png" style="width: 575px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1026037iD7D83731EDBCD719/image-size/medium?v=v2&amp;amp;px=400" role="button" title="Screenshot 2022-02-16 100729.png" alt="Screenshot 2022-02-16 100729.png" /&gt;&lt;/span&gt;&lt;/P&gt;</description>
      <pubDate>Wed, 16 Feb 2022 18:18:37 GMT</pubDate>
      <guid>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10954815#M1073115</guid>
      <dc:creator>R_Tweed</dc:creator>
      <dc:date>2022-02-16T18:18:37Z</dc:date>
    </item>
    <item>
      <title>Re: Sweep a handrail profile along an irregular helical curve in 3D?</title>
      <link>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10959258#M1073253</link>
      <description>&lt;P&gt;This worked great for me! Thank you! I have tons of control of their twist and can tweak it in any direction to achieve the look I want.&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Fri, 18 Feb 2022 15:58:32 GMT</pubDate>
      <guid>https://forums.autodesk.com/t5/autocad-forum/sweep-a-handrail-profile-along-an-irregular-helical-curve-in-3d/m-p/10959258#M1073253</guid>
      <dc:creator>JustinDT47Q</dc:creator>
      <dc:date>2022-02-18T15:58:32Z</dc:date>
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