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zoomy-prepost

Shared pre/postprocessing conversions for Zoomy — the general place for format conversion so backends don't each ship custom writers.

Today it converts VTK / ParaView .pvd → zoomy HDF5 (the format zoomy_plotting.read_hdf5 and the GUI read), so any backend that emits VTK (firedrake .pvd, foam / dmplex .vtu/.vtk) does one call and the normal postprocessing just works.

from zoomy_prepost import vtk_to_hdf5
vtk_to_hdf5("simulation.pvd", "simulation.h5")   # .pvd collection, .vtu, or [frames]
zoomy-convert simulation.pvd simulation.h5

Output layout (zoomy_core.misc.io convention):

/mesh/{dimension, type, n_cells, n_inner_cells,
       vertex_coordinates:(dim,n_vert), cell_vertices:(k,n_cells)}
/fields/iteration_i/{time, Q:(n_vars,n_cells)}

Install it only in the containers that need it (firedrake, foam, dmplex). Mesh conversion helpers can grow here too.

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