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Grid generation in 3d

from polymesh.grid import gridH8 as grid
from polymesh import PolyData, PointData, CartesianFrame
from polymesh.cells import H8 as CellData

# create a grid of 30 x 15 cells, with 2 x 2 nodes per cell
gridparams = {
    "size": (1200, 600, 100),
    "shape": (30, 15, 4),
}
coords, topo = grid(**gridparams)

frame = CartesianFrame(dim=3)

pd = PointData(coords=coords, frame=frame)
cd = CellData(topo=topo, frames=frame)

mesh = PolyData(pd, cd)

mesh.plot(notebook=True, jupyter_backend="static", theme="document")