Interface of the 3D Playground

This is just the interface of the 3D playground. You'll need an actual platform library to compile your application, and a 2D one with it (the 3D playground is built on the 2D one, which draws its HUD): elm_playground_3d_opengl with elm_playground_software for the desktop, elm_playground_3d_webgl with elm_playground_web for the browser. elm_playground_3d_software draws every pixel with our own code, for teaching; elm_playground_3d_web draws small scenes as SVG, without a GPU.