|Message: Rectangular artifact when visualizing in 3D||Not Logged In (login)|
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I see what seems like a rectangular artifact when visualizing positions of particles emerging from a target in 3D using ntuple->Draw("x:y:z"). This feature doesn't exist in the geometry of the simulation (20 MeV electrons scattering in thin layers of Mylar, phosphor, and ferrite) and doesn't show up in the 2D visualization of the data using using ntuple->Draw("x:y"). I have attached a 4-panel image to show this. (I have used the same mm scale for all axes). The top rows show 2D data (original and magnified), where the position data have circular symmetry as expected and there is no rectangular feature. The bottom row show same data in 3D from 2 different angles. There is a feature which is 80 mm in extent in the X direction which doesn't appear in the 2D data. Where is this coming from? Thank you for helping out. Neil Root commands used to create the attached images: root  TFile f("geant4_output_4_9_6_electron.root") root  c1=new TCanvas("c1", "geant4.9.6") root  c1->Divide(2,2) root  c1->cd(1) root  ntuple->Draw("x:y") root  c1->cd(2) root  ntuple->Draw("x:y","x>-5 && x<5 && y>-5 && y<5") root  c1->cd(3) root  ntuple->Draw("x:y:z") root  c1->cd(4) root  ntuple->Draw("x:y:z") root  c1->SaveAs("geant4.9.6_2D_vs_3D_4panels.png") Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2014/03/18/22.59-33935-.9.6_2D_vs_3D_4panels.png
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