I'm still desperated...
Let me show you what I need to solve this problem.
This .capx is currently working like that:
<img src="http://i.imgur.com/30nWdIS.png" border="0" />
Instance 0 is worked after all, it can determine the distances between other instances, the problem about Instance 1 to Instance 2 doesn't work.
I'm looking a solution like this:
<img src="http://i.imgur.com/7rXgvqy.png" border="0" />
Every instances can determine the distances to each instances, it made me headache because I couldn't figure it out.