Build:
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In the directory demo/external clone the following repositories:

$ git clone https://github.com/jtsiomb/gph-math.git
$ git clone https://github.com/jtsiomb/libimago.git

and build/install the libraries.

In the root (demo) directory run:

$ make

Run:
-----
To use the OpenGl backend:
$ ./demo -opengl

To use the Vulkan backend:
$ ./demo -vulkan

Default:
$ ./demo
(uses the OpenGL backend)

Use mouse motion + left click to rotate the camera and
right click + mouse motion to zoom in/out.