Dear gaters, Since GATEv5.0.0 added the capability of visualizing the source geometry, I tried GATEv5.0.0 few days ago to verify the position of my radiation sources -- though I really use GATEv4.0.0 for the simulation for consistency of my data. However, I noticed something in the photon interactions in the voxelized phantom as what I had seen in the visualization. In GATEv5.0.0, it seems like their are no interactions taking place in the voxelized phantom [see the attached Figure]. But, this situation did not occur in GATEv4.0.0 [see the other attached Figure]. Moreover, in GATEv5.0.0 when the "world volume" is set to be invisible: /gate/world/vis/setVisible 0 the voxelized phantom can't be visualized too. Is there anyone who noticed this too? Sincerely, Jan Mickelle V. Maratas -- #################################################### Physics Department, MSU - Iligan Institute of Technology A. Bonifacio Ave., Tibanga, 9200 Iligan City, Philippines ####################################################