How do I set up a "wrong way" HUD when actor is facing the wrong direction.
Determine this through the Dot Product of two vectors.
The two vectors would be
The possible values when you dot these two together can be seen here: http://chortle.ccsu.edu/vectorlessons/vch09/vch09_6.html
In that diagram, if red is the North vector and blue is the Player vector, then the value will be close to -1 when it is in the opposite direction. So you can check if the player is facing the wrong way when the dot value is, say less than -0.85
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