The Visualization Toolkit

Toolkit for 3D computer graphics and image processing

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Hunter's comment

The Visualization Toolkit, commonly abbreviated as VTK, is an opensource software system application used for 3D computer graphics, image processing and visualization.

VTK is the basis of a number of visualization applications such as QGIS, Molekel, MOOSE and many more.

Here is one example of it's implementation;

Link

https://vtk.org/