hemisphere with hollow bottom

You need to remove the line 'from netgen.csg import *'. Both the netgen occ and csg submodules have a Sphere object, so the occ one you want is overwritten by the csg one when you do the second import.

I take it you are now using a jupyter-notebook? Otherwise you also need to remove the line 'from ngsolve.webgui import Draw' to visualise in the old netgen gui.

dear sir,

actually I am not using Jupiter-notebook. I am using python (py-charm). I downloaded only the following software to run the Netgen. Am I wrong?

Install Python 3.7 if you do not already have it. Make sure to download one of the "x86-64" installers, and select the option "Add Python 3.7 to PATH" during the installation. Direct link to the installer
Install the Microsoft Visual Studio 2017 Redistributables.
Download the Netgen/NGSolve msi - installer of the latest release
Reboot your system after the installation and proceed to Getting started with Netgen/NGSolve


Do I need to install Jupiter-notebook? Can you please tell me what should I install? I am so sorry to bother you sir. I know this question might be the basic question, but I would really appreciate it, if you can give me the guideline. Thanks a million sir

Dear sir,

A millions of thank you for you. I finally got the geometry that I want based on your suggestions.
Thank you so much for your kind help. I pray everything in your life went ease and smooth.
Thank you so much sir.