[ODE] camera vs world collision detection

[Matthias Ferch]

hi!

i've integrated ODE in my project and it is working fine. now i'd like 
to add camera vs world collision detection. i want to manually 
translate/rotate the camera, not apply forces. so what i need is a geom 
that is never deactivated, even if auto-disable is turned on and that is 
not affected by any forces if it collides with another geom - it should 
just not be able to pass through. how can i manage that?

thanks in advance, matthias