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Hi Mikhail,<br>
You should just split the circle in 4, i.e.<br>
<br>
Point(1) = {0,0,0,0.5};<br>
<br>
Point(2) = {1,0,0,0.5};<br>
Point(3) = {0,1,0,0.5};<br>
Point(4) = {-1,0,0,0.5};<br>
Point(5) = {0,-1,0,0.5};<br>
<br>
Circle(1) = {2,1,3};<br>
Circle(2) = {3,1,4};<br>
Circle(3) = {4,1,5};<br>
Circle(4) = {5,1,2};<br>
<br>
Line Loop(5) = {1,2,3,4};<br>
Plane Surface(6) = {5};<br>
<br>
Extrude {0,0,1} {<br>
  Surface{6};<br>
}<br>
<br>
Regards, <br>
Ruth<br>
<br>
<br>
Михаил Артемьев wrote:
<blockquote cite="mid:E1JeQHO-0007CU-00.artmikle-mail-ru@f70.mail.ru"
 type="cite">
  <pre wrap="">Hello!
You created wonderful programm Gmsh.
But I can't understand how it is possible to build cylinder using function "extrude". I'm extruding surface-circle.
I send to you my ".geo" file, which (I think) can build cylinder in Gmsh.
But there is no right result.
I don't know where is my error.
Help, please.

Thanks.

Mikhail Artemjev, Russia, Novosibirsk State Technical University
  </pre>
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<br>
<pre class="moz-signature" cols="72">-- 
Dr. Ir. Ruth V. Sabariego
University of Liege, Institut Montefiore,
Dept. of Electrical Engineering & Computer Science, 
Applied & Computational Electromagnetics (ACE),
Sart Tilman Campus, Grande Traverse, 10 (B28), B-4000 LIEGE, Belgium
phone: +32-4-3663737 -- fax: +32-4-3662910 -- <a class="moz-txt-link-freetext" href="http://elap.montefiore.ulg.ac.be/">http://elap.montefiore.ulg.ac.be/</a></pre>
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