libvtk6-dev 6.3.0+dfsg2-5build2 (amd64 binary) in ubuntu focal

 The Visualization Toolkit (VTK) is an open-source software system
 for 3D computer graphics, image processing, and visualization.
 .
 This package provides the VTK header files required to compile
 C++ programs that use VTK to do 3D visualisation.