vtk Module Reference

VTK Module containing utilities for VTK file handling. More...

Functions/Subroutines
integer function, dimension(:), allocatable, public	vtk_ordering (cell_type, lx, ly, lz)
	Get the VTK node ordering for a given cell type. For Lagrange cells, returns an array mapping VTK node position to the 0-based tensor-product index (i + lx*j + lx*ly*k).
pure integer function, dimension(lx *ly *lz)	vtk_lagrange_hex_ordering (lx, ly, lz)
	Build the VTK Lagrange hexahedron node ordering for a given lx. Returns an array of size lx*ly*lz mapping VTK node position to the 0-based tensor-product index (i + lx*j + lx*ly*k). Implements VTK's PointIndexFromIJK for Lagrange hexahedra. Node ordering: 8 corners, 4 * (lx - 2 + ly - 2 + lz - 2) edge interiors, 6*(lx - 2)*(ly - 2) face interiors, (lx - 2)*(ly - 2)*(lz - 2) body interior.
pure integer function, dimension(lx *ly)	vtk_lagrange_quad_ordering (lx, ly)
	Build the VTK Lagrange quadrilateral node ordering for a given lx, ly. Returns an array of size lx*ly mapping VTK node position to the 0-based tensor-product index (i + lx*j). Implements VTK's PointIndexFromIJK for Lagrange quadrilaterals. Node ordering: 4 corners, 2*(lx-2) + 2*(ly-2) edge interiors, (lx-2)*(ly-2) face interior.

Detailed Description

References:

• https://vtk.org/doc/nightly/html/vtkCellType_8h_source.html
• https://scicomp.stackexchange.com/questions/42092/vtk-arbitrary-order- lagrange-elements-node-positions-ordering-on-reference-tri
• https://www.kitware.com/modeling-arbitrary-order-lagrange-finite-elements- in-the-visualization-toolkit/#:%7E:text=The%20new%20cells%20in%20VTK, may%20vary%20in%20Lagrange%20cells.

Function/Subroutine Documentation

vtk_lagrange_hex_ordering()

pure integer function, dimension(lx * ly * lz) vtk::vtk_lagrange_hex_ordering ( integer, intent(in)  lx, integer, intent(in)  ly, integer, intent(in)  lz  )

private

Parameters

lx	Number of points per edge in x-direction (polynomial order + 1)
ly	Number of points per edge in y-direction (polynomial order + 1)
lz	Number of points per edge in z-direction (polynomial order + 1)

Returns

Array of 0-based tensor-product indices in VTK order

Definition at line 96 of file vtk.f90.

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vtk_lagrange_quad_ordering()

pure integer function, dimension(lx * ly) vtk::vtk_lagrange_quad_ordering ( integer, intent(in)  lx, integer, intent(in)  ly  )

private

Parameters

lx	Number of points per edge in x-direction (polynomial order + 1)
ly	Number of points per edge in y-direction (polynomial order + 1)

Returns

Array of 0-based tensor-product indices in VTK order

Definition at line 182 of file vtk.f90.

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vtk_ordering()

integer function, dimension(:), allocatable, public vtk::vtk_ordering	(	integer(kind=1), intent(in)	cell_type,
		integer, intent(in), optional	lx,
		integer, intent(in), optional	ly,
		integer, intent(in), optional	lz
	)

Parameters

cell_type	VTK cell type (e.g. 72 for hexahedron)
lx	Number of points per edge in x-direction (polynomial order + 1)
ly	Number of points per edge in y-direction (polynomial order + 1)
lz	Number of points per edge in z-direction (polynomial order + 1)

Returns

Array of 0-based tensor-product indices in VTK order

Definition at line 59 of file vtk.f90.

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