Install C++ and OpenGL.
Have a STL file viewer also installed.
git clone https://github.com/vickymmcd/3DFractalMountains.git
cd 3DFractalMountains/code
make stl_from_hm
The STL file you generated will be titled "mountain.stl"
Open this file in an STL viewer such as MeshLab to see the terrain you generated.
cd 3DFractalMountains/terrain
make
./tg
The render can be controlled with mouse and arrow key input.