@halder I hope this message finds you well. I am currently conducting a temporal interference (TI) simulation using the LF Electro Ohmic Quasi-Static solver in Sim4Life, and I have encountered an issue regarding the electric field distribution at the electrode–skin interface. Here are the specific settings I used: There are four electrodes in total. For the first pair of stimulating electrodes, I assigned PEC material type to the other two electrodes (which are not used for stimulation). The stimulating electrodes were not assigned a material type; instead, I only applied Dirichlet boundary conditions to them. In the voxel settings, the four electrodes were set with priority = 1, and the Duke model with priority = 0. For the second pair of electrodes, I applied the same procedure accordingly. However, during post-processing, I noticed that the region where the electrodes overlap with the skin shows no electric field distribution, which seems physically unreasonable. Could you please advise if there might be an issue with my setup or if there are additional steps required to properly model the electrode–skin contact in TI simulations? Thank you very much for your time and support. I truly appreciate your help.

The tutorials are, unfortunately, not automatically synchronized to the cloud version yet. We can make the new ones available soon, though. Sorry for the inconvenience. If you send me an email (lloyd @ zmt.swiss), I can forward the notebook to you. Cheers, Bryn

@bryn ahh, I see. Thank you so much!

I ended up creating my Duke model in a separate script, where I first cloned him as static. Then I removed part of the body not relevant to me by boolean subtraction (entity by entity) and finally export the remain static model to a sab file, which I load in my main script instead of the entire Duke. It has been this confusion about entities and groups and what not disturbing the flow. Thanks for your suggestions bryn

That's helpful. Thank you for the detailed steps @bryn.

To measure the shortest distance between two entities, you can use the Python API: import XCoreModeling as xcm shell = xcm.GetActiveModel().SelectedEntities[0] coil = xcm.GetActiveModel().SelectedEntities[1] res = xcm.GetEntityEntityDistance(shell, coil) print(f"Shortest distance shell-coil: {res[0].Distance}") p1 = xcm.CreatePoint(res[0].ClosestPosition) p1.Name = "Point on Shell" p2 = xcm.CreatePoint(res[1].ClosestPosition) p2.Name = "Point on Coil" # This line is just to visualize where the measured distance was taken line = xcm.CreatePolyLine([res[0].ClosestPosition, res[1].ClosestPosition]) This would create something like this: [image: 1747752108672-c17b7bff-2d64-408c-88a7-fd83a4dadfdb-image.png] Some other snippets are shared here: https://forum.zmt.swiss/topic/565/geometry-modeling-snapping-to-endpoints-in-python-api/3?_=1747746585465

I would add that in the first approach you might change the tissue property of the original bladder to something else, e.g. fat, to get the desired effect of shrinking or stretching the bladder without creating air holes. Btw, you can measure the volume of a tissue surface in the modeler using the measure tool.

Okay, I will take those considerations into account. Thanks for the fast reply!

@bryn Is the 6.8 displayed on the color bar the actual maximum field strength value? I exported the values and found that the maximum is around 5.9 instead. [image: 1735124755536-42fb974e-d830-42c2-8373-84c85ee63339-image.png]

@bryn Thank you again for your reply and the posture file!

Thank you for the detailed answer!

Hi Bryn, I would like to ask a question regarding posing. My aim is to detect the variation in bone position from the skin in different poses (hypothesis being: as the soft tissues deform, the bone wont always be at the same position wrt the skin). I currently have 8 antennas placed around the skin which are supposed to mimic wearable antennas and I would like to move these antennas along with the pose. But if I link these antennas to the bone using "link-parent tool", the bone is always at the same location wrt to the bone irrespective of the pose. But I cannot link the antennas wrt to the skin as the antennas dont move with the pose. How can I do this? I would like the antennas which are placed around the skin to similar to the skin rather than the bone? Based on the first video in this chain, triangular meshes can be posed similar to the body. If I convert the antennas to meshes and then pose it, will I be getting the same issue i.e the bone is always at the same location wrt to the antennas? Thanks

Thank You, It really works.

Thank you! That helps a lot.

You can drag the entire group onto the simulation. The surfaces are tagged, and will be assigned to the correct material properties automatically. The reason for the locks is to prevent users from deleting individual surfaces, or editing them in some way. This would break the poser functionality. If you are bothered by this, or don't need to change the posture of the model, you can always select the bone mesh system and run "Clone As Static" in the context menu. https://youtu.be/CYI6rBPZw7E