[ODE] Gravity setup for solar system simulator

[David Taylor]

Hi,

I want to simulate solar systems using gravity to keep the planets 
circling the star and also affecting spaceships.

The documentation for dWorldSetGravity says giving an x, y, z of 0, 0, 0 
means there is no gravity. Does this mean the gravity system for ODE 
expects to work in a planar environment where there is a "floor" and 
can't be used for space simulations?

Regards,
David Taylor.

PS aside from this question I found the library extremely easy to use 
and was up and running in no time.