a simple cube.
- press up/down/left/right/pgup/pgdown to rotate the cube.
- press i/j/k/l/u/o to move the cube in space.
- press w/a/s/d/q/e to change the cube's size along any axis*.
- press l to lock size scaling so that all axes scale together.
- press r to reset everything.
* cubeness no longer guaranteed under non-uniform scaling.
MIT license; see LICENSE.md.