Cell lattice, fill, and universe aren't where I expect them to be.

[MicahGale]

Describe the bug

If a cell's modifier (lat, fill, u) are manually set after parsing (or ab initio creation) it does not export properly.

To Reproduce

import montepy

problem = montepy.read_input("demo/pin_cell.imcnp")

surfs = problem.surfaces
right_surf = surfs[104]
left_surf = surfs[103]
y_top_surf = surfs[106]
y_bot_surf = surfs[105]
z_top_surf = surfs[102]
z_bot_surf = surfs[101]

universe = montepy.Universe(1)

unit_cell = montepy.Cell()
unit_cell.number = problem.cells.request_number()
problem.cells.append(unit_cell)
unit_cell.geometry = -right_surf & +left_surf
unit_cell.geometry &= -y_top_surf & +y_bot_surf
unit_cell.geometry &= -z_top_surf & +z_bot_surf
unit_cell.importance.neutron = 1.0

# TODO promote top level
unit_cell.lattice = montepy.data_inputs.lattice.Lattice.HEXAHEDRA
unit_cell.fill.universe = universe

# assign to own universe
lat_universe = montepy.Universe(5)
problem.universes.append(lat_universe)
unit_cell.universe = lat_universe
print(unit_cell.format_for_mcnp_input((6,2,0)))

Prints:

['7 0 -104 103 -106 105 -102 101 IMP:n=1.0 ']

Version

• Version 1.0.0a3

[MicahGale]

Update: this is because problem.print_in_data_block["u"] == True 🤦🏻.

I think we should change the default behavior. Thoughts @tjlaboss?

[tjlaboss]

I agree that the default for all parameters should be on the cell card.