Zero G - how?

Hi folks,

I finally started to play with Torque after buying it some months ago. What I want to do is to create a space scene that's empty, except for a few asteroids.

I started by making a copy of stronghold.mis, and removing the TerrainBlock. This works okay, except that I now fall out of the world. So, my next task is to "turn off gravity".

I tried doing this by adding a PhysicalZone to the mission, but it doesn't seem to do anything. Does anyone have suggestions? Is there in fact a mission-wide gravity value that I can turn off? I'd prefer to do this than to tweak individual scene objects.

Here's the PhysicalZone I'm using:

new PhysicalZone(ZeroGZone) {
      position = "0 0 0";
      rotation = "1 0 0 0";
      scale = "1 1 1";
      velocityMod = "1";
      gravityMod = "0";
      appliedForce = "0 0 0";
      polyhedron = "-500 -500 -500 500 500 500";
   };

Thanks!