Including VTK when building opencv

First, we download VTK and build it.
http://www.vtk.org/download/

and
We set the path where VTK is built, when we build opencv.

Note that, we need to include the build path, not the installed path.

http://cvlecture.marearts.com/2016/12/opencv-build-shared-opencv.html
If you go to the above address, I have built VTK 7.1.
And new content will continue to be added.

Good luck!