In my first game, I noticed that a large number of scenes featured only the player-characters taking on various terrain or knowledge-based challenges (such as "break into this building" and "investigate this crime scene") which had no other (notable) characters present.
However, as far as I know the GM has a Fate-point per character available for each scene.
Am I expected to use these to generate opposition (and keep the Fate flowing) even in situations that feature no clear opposition from anything other than environment and circumstance? Or is it perfectly okay to end (many) scenes with the pool still mostly full?
Should I limit it to only when I can somehow justify it coming from passive opposition (you are trying to break into the home, but Shiaman knew you were coming and thinks More security is more better, so the locks have been upgraded) or should I just use it whenever? And in the above situation, how do I determine the difference between just setting the base difficulty higher (which was my choice during the game) or starting lower and then invoking for a higher value during the check?