Quote: "Yeah, 473892165083426487310546237189578493.0083 should do."
A few million should be more than enough. A number that high probably won't work. I'm not sure what size the pipeline is or what PhysX uses, but a safe bet is 32bits. A 32bit float would mean that you can't get more than 7 significant digits. So the number you quoted would likely clip out to 473892100000000000000000000000000000.0 and that's assuming it can even hit that many zeros.
Also, if you have it constantly apply an upward velocity of 9.8, then it won't fall...
You take a basketball and make it accellerate upward at a constant rate of 9.8 (that's 9.8 meters per second, per second), then it'll suspend itself in mid air. You do the same thing with a car, a tank, or with NASA's "Crawler", they'll all be suspended. All you have to do is negate gravity by applying an opposite force. This is why I suggest trying a large mass and giving it a constant upward velocity of 9.8. If it still falls, try 9.8 times object's mass.
It really all depends on whether the application of force to an object in the DP commands takes mass into account. If the force is "absolute speed of x" or "this much energy is applied". The latter needs you to multiply by mass.
Nothing I say is intended to be rude. My autism means that I do not know what is rude and what isn't rude. I apologize if I seem rude. It is not my intention.
