This is a threaded CPU ray tracer written in native C++. On a multi-core device, it should run at close to real time (About 10 interlaced frames per second on my Nexus 7). Thank you for your interest! Features: -Acceleration structures, interlacing, native implementation and multi-threading make this a very fast ray tracer. You can interact with the spheres during the render: something that is not possible with any other ray tracer currently on the Android Play Store. -Environment mapping and recursive reflections. Source code available at: https://github.com/ndahlquist/raytracer