What is G4VNestedParameterisation::GetMaterial(int) supposed to do?

Geometry, Fields and Transportation
1

I cannot find documentation on what G4VNestedParameterisation::GetMaterial(int) is supposed to do, and for that matter G4VNestedParameterisation::GetNumberOfMaterials().

Looking at the code, it seems that the loop

for(int i=0;i<param.GetNumberOfMaterials();++i){
    param.GetMaterial(i);
}

should go through all the materials used by the G4VNestedParameterisation. Is this correct?

2

Anyone? I really think that this should be documented…

3

Hi,

GetMaterial(G4int i) returns the material of the volume with CopyID equal to i.

it seems to me the loop does what you say.

cheers

4

Thank you! Just to confirm: I need to implement my own GetMaterial (for my class deriving from G4VNestedParameterisation), so the definition of CopyID seems to be entirely up to me.

This is in contrast with G4VNestedParameterisation::ComputeMaterial, which is more intuitive to implement, because I know it should return (and set…) the material for the nested volume. But I am not sure where GetMaterial is called and what it is supposed to do…

5

The CopyID of the volume depends on how the parameterised geometry has been done (order of subdivisions along X, Y and Z).

The GetMaterial(i) method in G4VNestedParameterisation is virtual. How I use it in my simulation is to return the material of voxel i. But it seems to me that the use of this method is optional to the user.

6

My apologies, I missed your reply.

As far as I could tell, the method was called for all values of i from 0 to GetNumberOfMaterials()-1. If I did not go through one of the materials set in the volume, my program crashed. I do not think it is optional…