Thank you for the response, it has helped me get a couple of steps closer.
Here is what I see after I load the model, convert to segmentation, create ROI node, and then use the ROI to define the segment geo (it is now generating a master volume, though Slicer says that the volume is out of frame in the bottom views):
When I then run Segment Mesher on the segmentation I get the same error as before, but a Label Map Volume is created (when I enable view of it nothing seems to show up except its name in the bottom views):
Ignoring Segment Mesher and going straight to using Cleaver Test Mesher extensions, I can run the mesher on my segmentation master volume without error but nothing seems to change at all…
(At one point I was able to get the sides of the cube to render in the bottom views but I cannot recreate it again)
I would appreciate any form of clarification of the steps to go from a simple model(surface mesh) to Cleaver’s output.