I read:

I'm building a GEM patch with some kinematics simulation (like gravity, inertia, collisions). Is there a way to check if two GEM objects share space?

I don't think so , but then again I'm not a |gemhead| ;)

How can I obtain the screen coordinates of a GEM object? Or test if a

I guess your patches should know

screen coordinate lies within a certain GEM object?

roll your own I guess such abstraction would be very useful for many people all I googled up in the short time was:

http://www.gamasutra.com/features/20000330/bobic_01.htm

or if you want to go the externals road you might find

http://photoneffect.com/coldet/

interesting

regards,

x