sandglass PoC with bullett physics

Sandglass with 5000 sand particles (cubes) animated with blender game engine / bullett physics.

Need a very large scale for the hourglass (dimensions 200x200x400) otherwise the bullett engine doesn't work well...

To make it stick to the reality, you need to increase the particles number and lower the size of the cubes. (I haven't enough power/ram on my PC)

Blend is here:
https://docs.google.com/open?id=0B2BWubg0Qrg4WUNlVTBCOU5EN0E