|Message: Re: Add a mother volume at TestEm18||Not Logged In (login)|
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Your DetectorConstruction class seems to be valid, to understand why you got a crash you need to locate it with some debug tool, simplest - gdb.
Also note, that this TestEm18 example is a specific one intended to show effects of energy loss processes without multiple scattering. Due to this the geometry is very simple - only world volume. It was not assumed that this example will be extended to a more complex application. If you wish have more complicate geometry and EM physics, then TestEm3,5,7,8,9 are the best choice for a starting point.