Custom material/configuration
Description
Since pixel detectors could have many different configurations, ability to choose sensor type or better define the interaction volume is essential. This could be achieved using Geant4 functionality - access to the predefined material database and possibility of importing special structures via GDML files.
Proposal
The idea could be solved by enabling usage of Geant4 NIST material database (in addition to couple of predefined materials). Furthermore, importing GDML files (configuration of a pixel or its parts) could be added where user can define exact composition of single pixels and its partial materials.
Use cases
Usefulness of this would be in variable definition of sensitive materials (such as Ge, GaAs) or in creating very specific layouts with non-defined materials, layers.
Feature checklist
Make sure these are completed before closing the issue, with a link to the relevant commit.
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Covered by test cases