* A Vector pseudo-3D Engine from scratch written in Turbo C++ when I was 15. I didn't know about OpenGL, so it was written using the wonderful <graphics.h> pack

* A Vector pseudo-3D Engine from scratch written in Turbo C++ when I was 15. I didn't know about OpenGL, so it was written using the wonderful <graphics.h> packed with turboc. I used it to create a tank wars game, with explosions and fully destructible level, level editor, animated 3D menu, and of course tanks :) * An algorithm to generate a "spine-spline" for an arbitrary 3D closed loop (simplest form is a torus): Essentially a path that passes through the volumetric centroid of the 3D object and closes with itself (for my upcoming game, to generate the pathway for a level just by uploading the 3D model for the level) * Porting bitgym.com's vision processing algorithm to work on Android devices: Getting the camera frame pixel data in realtime, downsampling the image, integrating with a C++ vision processing algorithm through JNI, and making it actually finish a round-trip in under 50ms, and work on hundreds of different Android (versions and) devices. Actually considering there are still occasional crashes and bugs with BitGym on Android, I guess this is an ongoing challenge, still being solved! * Countering the drift and rotational aberration in a high speed stepper motor that was trying to point a laser pointer at multiple precise coordinates on a flat wall, in quick succession (for college robotics class).