I am trying to run a case where an electron beam hits a tile. I am facing some issues with geometry even if the geometry is defined in the correct way since no errors are shown in the geometry tab. In particular, the error occurs when I define two planes that cut a RPP in order to have a certain shape at the top of the tile.
I am attaching here the .flair file where the error occurs. PROVA.flair (2.0 KB)

Dear @Singh ,
Thank you for your message. The error comes from the fact that particles are transported infinitely in the geometry, given that the blackbody region does not cover completely your geometry. When you define the VOID region with the expression (void -base -triangle | -taglio1 | -taglio2), the planes taglio1 and taglio2 are infinite, so the union is infinite as well. Try defining the regions as unions of finite bodies, so that the target is fully surrounded by a blackbody region.