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Voxel representation and finite element transformation: {i, j, k} and {X, Y, Z} are the indexes of the voxels’ three-dimensional matrix and the global coordinates of the structure, respectively. The coordinate k' means k' = R − k, where Ris the third size (along Z) of the voxels’ three-dimensional matrix (N × M × R). (a) Voxel indexes;(b) hexahedral elements.
