RuntimeError: Failed to create voxels. No valid grid configuration available.

[mypi]

Modifying the jupyter tutorial for the pTxCoil emfdtd, where I have basically just replaced the model with my own, I am incapable of voxeling:

The modelling checks out fine. It plots everything and it looks sane. In the Simulation section, the usual stuff shows up,

Can anyone discuss why voxeling sometimes fail...

This is a summary of the many lines error output:

Error : Unable to retrieve information from model analyzer for entity id ffa14448-e74a-4fb1-add7-d970a1b4afeb
Error : Unable to analyze components: Grid driver task(s) failed.
Error : Failed to update grid after processing all components.
Error : Unable to compute grid.
...
Traceback (most recent call last):
File "...johndoe.py", line 713, in <module>
main()
File "..johndoe.py", line 709, in main
RunTutorial(project_path)
File "..johndoe.py", line 681, in RunTutorial
sim.CreateVoxels(smash_path)
File "C:\Program Files\Sim4Life_8.2.0.16876\Python\Lib\site-packages\s4l_v1\simulation_emfdtd_impl.py", line 1005, in CreateVoxels
self.raw.CreateVoxels()
RuntimeError: Failed to create voxels. No valid grid configuration available.

def RunTutorial(smash_path):
    document.New()
    CreateModel()

    sim = CreateSimulation(use_graphcard=False)

    document.AllSimulations.Add(sim)

    sim.UpdateGrid()
    sim.CreateVoxels(smash_path)
    # Note, keep this flag to true even if no further processing is being done
    # ask PC or MaG
    sim.RunSimulation(True)  # True = wait until simulation has finished


def main(data_path=None, project_dir=None):
    """
    data_path = path to a folder that contains data for this simulation (e.g. model files)
    project_dir = path to a folder where this project and its results will be saved
    """
    import os
    import sys

    print("Python ", sys.version)
    print("Running in ", os.getcwd(), "@", os.environ["COMPUTERNAME"])

    if project_dir is None:
        project_dir = os.path.expanduser(
            os.path.join("~", "Documents", "s4l_python_tutorials")
        )

    if not os.path.exists(project_dir):
        os.makedirs(project_dir)

    fname = os.path.splitext(os.path.basename(_CFILE))[0] + ".smash"
    project_path = os.path.join(project_dir, fname)

    RunTutorial(project_path)


if __name__ == "__main__":
    main()

[bryn]

Not sure what is wrong, but I would look for the model entity with the Id "ffa14448-e74a-4fb1-add7-d970a1b4afeb", i.e.,

import XCore
import XCoreModeling as xcm

all_entities = xcm.GetActiveModel().GetEntities()
all_entities = xcm.CollectEntities(all_entities)

for entity in all_entities:
    if entity.Id = XCore.Uuid("ffa14448-e74a-4fb1-add7-d970a1b4afeb"):
        print(f"Entity {entity.Name}: valid={entity.Valid}, type={type(entity)}")

For some reason the gridder cannot process it. "Valid==False" means it was deleted from the model, but you still have an (invalid) handle.

[mypi]

@bryn
Thank for the advice bryn. It turned out my phantom was passed on as an entitygroup and not a solid with a volume. When extracting it, the voxeling completed for that and the rest of the parts... It currently runs, but I will try your suggestion when it is done.

[bryn]

Hmm, i wonder if that is a bug. The EntityGroup should not be assigned to any simulation settings, like grid settings.

[mypi]

So my problem was solved for the simple phantom a sphere. It can be voxeled. I am having a discussion with chatgpt about how to load Duke into the simulation section because currently it wont be voxeled. Is there a simple few lines of code that loads Duke and all the default tissue electrical properties or is it necessary to assign each tissue type in a loop or via thousands lines of code (as I have seen elsewhere)....