Why the warning message occured?

I promoted the Geant4 version from 10.6 to 10.7 in windows plotform, when i run the examples B1 or B4a, the warning message occured:

the geometry can be visualized, but not the particle track?
what cause this warning message?

you probably did not configure geant4 the same as before. The message tells you that the visualization options are different. You’ll find available options here: Building and Installing from Source — Geant4 Installation Guide 10.7 documentation

Look out for GEANT4_USE_OPENGL_WIN32 or GEANT4_USE_QT when carefully studying the documentation :slight_smile:

why geometry visualization worked well, but particle track not?

We have found that this can happen if the graphics driver is not up to date. Find out what graphics card you are using and surf the net for the latest driver and install it. See if that helps.