oSP3D supports the simple legacy VTK file format specification defined in [8]. Support is limited to the
UNSTRUCTURED_GRID dataset type only.
A typical file extension for simple legacy VTK input files is .vtk. The oSP3D simple legacy VTK import interface accepts all file extensions and does not distinguish between them. As described in [8], the input file consists of five basic parts in the following order:
File version and identifier
Header that can be used to describe the data and to include any other pertinent information
File format
Dataset structure
Dataset attributes
The definition of the finite element mesh must be given in the last two parts.
Compared to the simple legacy VTK Syntax in [8], the oSP3D simple legacy VTK import interface supports only some of its syntax elements. The following list, not exhaustive, includes some limitations:
All parts are required
Only the ASCII file format is supported.
Due to the VTK input interface limitations, each passed simple legacy VTK input file must contain a non-empty model data definition. This definition can be given only with the keywords and their parameters in the following table. All other keywords are ignored.
| Keyword | Description | Supported Parameters | Comments |
|---|---|---|---|
ASCII | Defines the file format type | — | The format type BINARY is not supported
and leads to an exception. |
DATASET | Starts the description of the geometry and topology | UNSTRUCTURED_GRID | — |
POINTS | Defines the geometry | n | — |
CELLS | Defines an element directly by specifying its nodes | n | — |
CELL_TYPES | Defines the element type | n | TYPE support is limited to the linear cell
types VTK_TRIANGLE,
VTK_PIXEL,
VTK_QUAD,
VTK_TETRA,
VTK_VOXEL, and
VTK_HEXAEDRON. Other
TYPE values are ignored. |
Note: The oSP3D installation includes a simple VTK input file: vtk.vtk. For more information, see Input File Examples.