In cad-based-geometry.ipynb notebook, openmc v0.15.3 reports ERROR: Too few source sites satisfied the constrains ... for the teapot example.
Setting source rejection in block 19 to a smaller value than its default helps:
settings.source_rejection_fraction = 1e-5
In cad-based-geometry.ipynb notebook, openmc v0.15.3 reports
ERROR: Too few source sites satisfied the constrains ...for the teapot example.Setting source rejection in block 19 to a smaller value than its default helps: