vtk
What is a .vtk file?
model/vnd.vtk
The legacy VTK file format stores scientific visualization datasets such as polygonal meshes, structured grids, and unstructured grids in a compact header plus ASCII or binary data sections. DATASET selects the topology, while POINTS, CELLS, POLYGONS, and attribute blocks describe geometry and associated scalar or vector values.
How to use a .vtk file
Use an example .vtk file to test header and encoding detection, topology counts, numeric parsing, point and cell attributes, and semantic comparison of bounds and connectivity after import or conversion.