|Message: Changing Density for a Material||Not Logged In (login)|
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It is not possible to change the density on-the-fly for a given material in Geant4.
Typically, what one does for DICOM data is to map density to a limited number of materials. For each material, various cross sections are computed on-the-fly at startup (density cannot be changed after that).
A reasonable number of materials would be something from a few tens to a hundred or so.
Once you have a set of materials, it is no problem to assign a different one of these materials to each voxel in a nested parameterization. This part is done in the "ComputeMaterial" method of the NestedParameterisation class. An example of this is in examples/extended/runAndEvent/RE02
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