David Culp:

David Culp:

I'm looking through the AI code, trying to find the bug that's killing the
thermals.  The following things don't look right:

1)  AIManager::101  ,   the Traffic Manager pointer is searched for by name at
every dt.   I'll leave this for you to look at.

2)  AIManager::295  ,  the thermal height is not being set.  We need to
restore the line:         ai_thermal->setHeight(entity->height_msl);
This fixes the thermal problem.

3)  AIManager::328  ,  I changed the fetching of the user state to occur every
sim cycle, and changed the fetching function from by-name lookup to a lookup
by node pointer.  It should be faster now, and more accurate too.  This helps
the air-refueling.