Seems to be working with pressure and surface tension/certain variables. Viscosity is off.
Surface tension/pressure look good. Viscosity is the issue.
Viscosity temporarily taken out. Other forces computed correctly.
Added pause (x), exit (space), and pop (p) key commands.
Particle density increased, so viscosity not out of control.
Speedup somewhat working. Need to test w/ better code. Can handle way more particles.
added note on cubes algorithm.
Changed some default values. Added some extra code.
Merge conflicts resolved.