Need help determing object location

I have a ball that moves (thru plain old physics) down a trajectory but could land in one of 9 slots, i need a way to be notified the slot it fell in.

I played a bit with the at_target event but it didnt seem to do anything

Any ideas?

Ranked easiest to hardest:

1) llVolumeDetect objects in each slot
2) Know all nine regions. If llGetPos is between these points on X/Y/Z, you're here.
3) - llSensor on the slot board
- Compare where you are to where the center is with llDetectedPos/llDetectedRot and local rotations (check the wiki)
- If you've stopped in this threshhold, you're in this slot

Sounds like Plinko... if prims aren't a concern, use 9 prims as collision detectors that only detect a collision with the ball. When a collision is detected, the slot number is sent to the CPU.

If prims are pricey, you could do math. I assume the 9 slots are separated by 10 dividers. When the machine is placed into the world (or it's pos/rot is changed) the machine collectes location data from the slot dividers. When the ball settles into a slot, it gets it's location, then compares that location with the known locations of dividers... it that location is greater than divider#0, but less than divider#1... the ball is in slot 1. However, greater than divider#6, less than divider#7 means slot 7.

Of course, you'd have to detect the rotation to detect if the calculations should be reversed.

I think VolumeDetect may be a good answer here, thanks folks!