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File Formats  VTK File Formats  The file format used by Paraview
and VTK is quite simple, but there are many subformats that may
lead to confusion. Common to all formats is:    • A right-handed
cartesian coordinate system is used.   •  Both coordinate points
and cells (= the area between the points) are defined in the
file, so data values can be assigned either to points or to
cells.   • The data values can be integer or floating point
numbers (C variable types: int32 or float), of any dimension
(scalars, vectors, tensors).    • ASCII floating point numbers
are written with a decimal point (not comma!); the scientific
notation (like "3.14E-3") can also be used. Binary values are
written in "C style", i.e. without the additional data that
Fortran prepends/appends.    • An arbitrary number of datasets
can be assigned to the points or the cells, but since a file can
contain only one coordinate grid, each dataset must have data
values for every coord