Marv
>> just a thought.
I wasn't expressing disinterest in the TDexample - quite the contrary. My first look at it was with something else in mind. I have now tested it big time and really learnt a lot. There is no doubt extension are useful but I like working with the code directly - it seems the best way for me to learn.

a tad off topic but...
My next challenge is testing multiple instances for turn-around on a path/walk collision.
# enemy collides with Left-path-marker = turn around, go right
# enemy collides with Right-path-marker = turn around, go left
The challenge is paths of different lengths. Ie. the shortest path/collision forces all instances to turn (with my current set up).
The ideal would be that each instances can complete the full path length - ie. independent switching.
______any suggestion?