Hello,
If OpenMEEG doesn’t crash and returns a gain matrix, it’s not a memory issue.
If you only have a few very strong values and zeros everywhere, it could be due to some anatomical singularities that are not handled well by OpenMEEG.
You can try to increase the resolution of the BEM meshes you are using to generate your model (>2000 vertices per layer).
Or use a spherical head model…
I’ll transfer your message to the OpenMEEG developers, in case they have anything to add.
Cheers,
Francois