"draw sphere not working!!! :((("
draw2 works
leadfrog integration prototype
particle::draw() working :DDDD
move draw to particlesystem from particle
drawWiredGrid
added stubs for compute force field
sph code complete. need debugging & parameter tuning.
added surface tension. fixed smooth kernels.
moved const to static; changed initps
naive out of boundary check
fixed a bug for if condition inside kernels
fixed bugs for f_pressure and f_gravity
fixed spikykernelgradient sign related to f_press dir
added f_surfaceTension (may need to change thres)
fixed a bug in collision detection. added grid.

grid needs serious debugging.
took out grid. working version.
added maya export.
fixed gradscreen parameter
fixed collision handle bug.