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Question Problem defining FastSimulationModel with Logical World Volume 

Keywords: Problem FastSimulationModel World Volume
Forum: Fast Simulation, Transportation & Others
Date: 24 Feb, 2006
From: Apostolos Tsirigotis <Apostolos Tsirigotis>

Hi,

I want to implement a Fast Simulation Model in the World Logical Volume with Geant 4.8. I have the following code in the Detector Construction:

**************************************************************

G4VPhysicalVolume* MyDetector::Construct( )
{
......
......
  G4Region* detectorRegion = new G4Region("EM_Detector_Region");
  detectorRegion->AddRootLogicalVolume(logicalMyWorld);
  MyEMShowerModel* myShowerModel =
    new MyEMShowerModel("emShowerModel",detectorRegion);
......
......
}

***************************************************************

MyEMShowerModel class inherits from the Abstract Class G4VFastSimulationModel

But, when I run the program I get the following error:

****************************************************************

......... ......... .........

The world volume has a user-defined region <EM_Detector_Region>.

*** G4Exception : RUN:WorldHasUserDefinedRegion
      issued by : G4RunManager::DefineWorldVolume
World would have a default region assigned by RunManagerKernel.
*** Fatal Exception *** core dump ***

*** G4Exception: Aborting execution *** Aborted

****************************************************************

I have done this , and is working properly with Geant 4.7.

How can I do this in Geant 4.8 without having to change the detector geometry?

thanks...

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1 None: Re: Problem defining FastSimulationModel with Logical World Volume   (Makoto Asai - 27 Feb, 2006)
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