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<p>Hello,</p>
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<p>First of all I would like to thank you for making the excellent GMSH software publicly available.<br>
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<p>Now on to my question. I am trying to rotate a surface around an axis four times; thus, generating a structured hex mesh of a volume in the shape of a "shell".</p>
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<p>In the attached example you can try to generate the shape of a hollow pipe (simple example for illustration purposes) with and without `SetFactory("OpenCASCADE");` by rotating a rectangle four times about an axis. By running the example (requires version
3.X) in the GUI you can see how the error `findRootSourceFaceForFace() failed` appears when the OpenCASCADE is used. The attached PNGs are screenshots of the respective result.
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<p>My question is if there is simply something I have completely missed in the manual?</p>
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<p>Regards,</p>
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<p>Sigve Karolius<br>
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