[CIG-SHORT] How to create an ellipsoid magma chamber with CUBIT/Trelis?

[tu xiang]

Hello, everyone,

As shown in the attached figure, I want to create an ellipsoid magma chamber with CUBIT/Trelis. But I don't know how to create an ellipsoid. There is no ellipsoid in the Primitive Geometry. I tried many other methods, but did not succeed.
Hope someone may give me a hand.

Best regards,

Tu Xiang
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.geodynamics.org/pipermail/cig-short/attachments/20180418/c617e51e/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: chamber.jpg
Type: image/jpeg
Size: 35568 bytes
Desc: chamber.jpg
URL: <http://lists.geodynamics.org/pipermail/cig-short/attachments/20180418/c617e51e/attachment-0001.jpg>