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    <title>tema Re: Erratic polygon extrusion en AutoCAD Forum</title>
    <link>https://forums.autodesk.com/t5/autocad-forum/erratic-polygon-extrusion/m-p/11976887#M1106473</link>
    <description>&lt;P&gt;How are you making the octagons?&amp;nbsp; The wrong result sounds like the octagons have had their corners Chamfered, at a tiny chamfer distance if it's not visually apparent.&amp;nbsp; When the result with triangular faces happens, check whether the Polyline "octagon" really has only 8 vertices.&lt;/P&gt;
&lt;P&gt;&amp;nbsp;&lt;/P&gt;
&lt;P&gt;Also, are your "8 rectangular faces" when it goes wrong really rectangular?&amp;nbsp; When I try the situation I described, between the "triangular" faces [which are really trapezoidal with a near-zero bottom width] are faces that are not rectangular, but trapezoidal, only at less taper than your intended result:&lt;/P&gt;
&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Kent1Cooper_0-1684581020406.png" style="width: 600px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1216989i483D4885C4555769/image-size/medium?v=v2&amp;amp;px=400" role="button" title="Kent1Cooper_0-1684581020406.png" alt="Kent1Cooper_0-1684581020406.png" /&gt;&lt;/span&gt;&lt;/P&gt;</description>
    <pubDate>Sat, 20 May 2023 11:11:34 GMT</pubDate>
    <dc:creator>Kent1Cooper</dc:creator>
    <dc:date>2023-05-20T11:11:34Z</dc:date>
    <item>
      <title>Erratic polygon extrusion</title>
      <link>https://forums.autodesk.com/t5/autocad-forum/erratic-polygon-extrusion/m-p/11976611#M1106462</link>
      <description>&lt;P&gt;I'm an OG user with ACAD 2000. I'm creating 8 sided prismatic truncated cones. I'm extruding octagons from the small end with a negative taper. Sometimes I get my desired solid with 8 trapezoidal faces. Other times, with the exact sequence of extrude commands, I get a solid with 8 rectangular faces and 8 additional triangular faces. I can't control which I get.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;Confused in Detroit&lt;/P&gt;&lt;P&gt;Donna&lt;/P&gt;</description>
      <pubDate>Sat, 20 May 2023 05:43:49 GMT</pubDate>
      <guid>https://forums.autodesk.com/t5/autocad-forum/erratic-polygon-extrusion/m-p/11976611#M1106462</guid>
      <dc:creator>donnaphier</dc:creator>
      <dc:date>2023-05-20T05:43:49Z</dc:date>
    </item>
    <item>
      <title>Re: Erratic polygon extrusion</title>
      <link>https://forums.autodesk.com/t5/autocad-forum/erratic-polygon-extrusion/m-p/11976887#M1106473</link>
      <description>&lt;P&gt;How are you making the octagons?&amp;nbsp; The wrong result sounds like the octagons have had their corners Chamfered, at a tiny chamfer distance if it's not visually apparent.&amp;nbsp; When the result with triangular faces happens, check whether the Polyline "octagon" really has only 8 vertices.&lt;/P&gt;
&lt;P&gt;&amp;nbsp;&lt;/P&gt;
&lt;P&gt;Also, are your "8 rectangular faces" when it goes wrong really rectangular?&amp;nbsp; When I try the situation I described, between the "triangular" faces [which are really trapezoidal with a near-zero bottom width] are faces that are not rectangular, but trapezoidal, only at less taper than your intended result:&lt;/P&gt;
&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Kent1Cooper_0-1684581020406.png" style="width: 600px;"&gt;&lt;img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1216989i483D4885C4555769/image-size/medium?v=v2&amp;amp;px=400" role="button" title="Kent1Cooper_0-1684581020406.png" alt="Kent1Cooper_0-1684581020406.png" /&gt;&lt;/span&gt;&lt;/P&gt;</description>
      <pubDate>Sat, 20 May 2023 11:11:34 GMT</pubDate>
      <guid>https://forums.autodesk.com/t5/autocad-forum/erratic-polygon-extrusion/m-p/11976887#M1106473</guid>
      <dc:creator>Kent1Cooper</dc:creator>
      <dc:date>2023-05-20T11:11:34Z</dc:date>
    </item>
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