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import gmsh
import sys
gmsh.initialize(sys.argv)
s = gmsh.model.occ.addRectangle(0, 0, 0, 3, 2)
gmsh.model.occ.synchronize()
m = gmsh.model.occ.getMass(2, s)
print("mass from occ = ", m)
p = gmsh.model.addPhysicalGroup(2, [s])
gmsh.model.mesh.generate(2)
gmsh.plugin.setNumber("MeshVolume", "Dimension", 2)
gmsh.plugin.setNumber("MeshVolume", "PhysicalGroup", p)
t = gmsh.plugin.run("MeshVolume")
_, _, data = gmsh.view.getListData(t)
print("volume from mesh = ", data[0][3])
gmsh.finalize()
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