Examples

A minimal usage pattern for writing an UnstructuredGrid file is:

use vtkhdf_ug_file_type
type(vtkhdf_ug_file) :: file
integer :: stat
character(:), allocatable :: errmsg

call file%create("mesh.vtkhdf", comm, stat, errmsg)
call file%write_mesh(points, cnode, xcnode, types)
call file%write_cell_data("pressure", pressure)
call file%close()

This illustrates the required ordering of calls: create the file, write the mesh, write any static or temporal datasets, and finally close. For temporal datasets, first capture the returned cell or point data handle and then use that handle for each temporal write. For each step, call start_time_step(time), write temporal datasets, then call finalize_time_step().

For MultiBlock output, first capture the handle returned by add_block and use that handle for subsequent block operations:

use vtkhdf_mb_file_type
type(vtkhdf_mb_file) :: file
type(vtkhdf_block_handle) :: block

call file%create("mb.vtkhdf", comm, stat, errmsg)
block = file%add_block("fluid", is_temporal=.true.)
call file%write_mesh(block, points, cnode, xcnode, types)
call file%close()

More complete examples (serial and MPI-parallel, UnstructuredGrid and MultiBlockDataSet) are provided in the examples directory of the project repository.