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Hi Andrea, you may want to try GRAS with the latest Geant4 release, 10.2, as previously the computation of the geometrical volume for a tessellated solid was not done with a precise formula. Hope it helps, Cheers, Gabriele ------------ On Wed, 23 Dec 2015 13:01:16 GMT, andrea lucaroni wrote: > Dear all > > i have a geometry in gdml format. > I created this geometry with Instep, the code is loaded correctly, but it > seems that the volumes are empty, when i run with gras, i'm reporting under > the line of analysis of geometry by gras. > > [GRASGeometryUtil::ListLogicalVolumes]: 471 volumes in the store > Volume <CSP_1_vol> Material: Al Mass: [kg] 1.62854e-12 ([kg] > 1.62854e-12 including sub-tree) > Volume <CSP_2_vol> Material: Si Mass: [kg] 8.45983e-13 ([kg] > 8.45983e-13 including sub-tree) > Volume <CSP_3_vol> Material: Al Mass: [kg] 1.16744e-14 ([kg] > 1.16744e-14 including sub-tree) > Volume <CSP_4_vol> Material: Al Mass: [kg] 1.1665e-14 ([kg] > 1.1665e-14 including sub-tree) > Volume <CSP_5_vol> Material: Al Mass: [kg] 5.7097e-14 ([kg] > 5.7097e-14 including sub-tree) > Volume <CSP_6_vol> Material: Si Mass: [kg] 5.25532e-13 ([kg] > 5.25532e-13 including sub-tree) > Volume <CSP_7_vol> Material: Al Mass: [kg] 4.4183e-14 ([kg] > 4.4183e-14 including sub-tree) > > for example: > mass of CSP_2_vol must be about 4e-3 kg not 8.45983e-13 kg > > Are there commands from put in the gdml file to consider the solid volumes ? > > thanks > best regardes > Andrea