Can any help me to edit the geometry of the OpNovice example?

I tried to edit the GDML file, but it was not going to update the value provided in the GDML file.

How did you modify the file, and what did you see when running example with it?

I change these values in GDML file

How are you running OpNovice and have you’re passing the GDML file you modified to it (via the -g argument)? Does your Geant4 install have GDML support?

Sir, Now give the dimension without the GDML file. Now it’s working, but I want to generate the hologram in geant4 count vs Energy.

I believe we already covered the topic of scoring here: To measure the precise position of beam strike on the front and back chamber and the number of beams passed through the middle block - #7 by bmorgan