Visualization Toolkit format. Used for storage of 3D models. Native format of the open-source Visualization Toolkit software. ASCII or binary format. VTK is an acronym derived from Visualization Toolkit. Stores a single 3D object as a collection of line, point, and polygon primitives and their properties. Can also store nonlinear graphics primitives. Allows user-defined format elements. Originally developed by Kitware.
Import and Export are fully compatible with the ASCII and binary versions of the VTK format.