Line of Sight...
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Here's my example of using the "invisible bullet" method to determine line of sight when obstacles are present, and then having only the instance(s) with LOS react.
many thanks :)
Yann: yes, found this thread before few hours, and just made it through the line-of-sight solution, which seems to be fastest and free of bugs.
<img src="http://construct-games.de/wcf/attachments/public/solution.png" border="0" />
best regards :)