How to use neBEM of GARFIELD++ to add chargs?

Dear GARFIELD++ people:
I try to use the nebem to calculate the field map of the THGEM for simulation of charging-up effect.
but I can’t find the way to add charge density. There is no macro or example to use garfield++ to finish this.
Thanks for any help.

I guess @hschindl can help.

there is indeed no mechanism at the moment to set charge densities through the Garfield++/neBEM interface, but it’s probably not too difficult to implement the necessary functions.
Could you get in touch with the author of neBEM (

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