Summary

In this chapter, we created a short and sweet, lightweight graphics engine to build new Cardboard VR applications. We abstracted the low-level OpenGL ES API calls into a suite of Material classes and a Camera class. We defined RenderObject for geometric entities, a Camera and Light components which inherit from a Component class. We defined a Transform class to organize and orient entities (which contain components) hierarchically in 3D space. All of this is integrated under the RenderBox class, which is instantiated and controlled in the MainActivity class, which, in turn, implements the IRenderBox interface. We complete the circle by specifying the MainActivity class as the implementer of IRenderBox and implementing setup, preDraw, and postDraw.

To develop the library, we followed much of what was covered in Chapter 3, Cardboard Box, with less explanation of how to use OpenGL ES and matrix libraries and more focus on implementing our RenderBox software architecture.

The resulting...