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2022-09-02 17:53 dustin  
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looks similar to "funny flies 28" with fly genders reversed, but there are significant differences.  
  
first of all, the short loop of ff28 was 4 and the long loop 12, while this one has 12/36. all 12 phases are shown in the map!  
  
to understand what happens here, it makes sense to divide the 12 phases into 3x4 like in the cave map:  
  
phases 1-4: "bleft-3", act 1  
the 3 bflies, which are the main actors in the dfs (both fireflies act as pure blockers who are just spinning), start with a mirrored fright-3 formation. but in phase 4, the bottom ffly interferes, kicks a butterfly out of the vortex and lets the third bfly in instead.  
  
phase 5-8: "bleft-3", act 2  
the mirrored fright-3 formation gets another go with a different vortex. in phase 8, the bottom ffly again interferes and does the same thing as before - it kicks a bfly out of the vortex and lets the third bfly in.  
  
phases 9-12: reconstruction  
this time, the bfly who has just moved into the vortex faces into the wrong direction so the vortex cannot really be rebuilt. so these four phases are needed to reconstruct the vortex formation with the help of both fflies. (actually the top ffly is needed only once per short loop! btw it could be replaced by a bfly.)  
  
that's the purely technical point of view, but when i look at the dfs i don't really "see" the reverse fright-3 formation, but rather 3bf in a variety of formations:  
  
|.| .|.  
.|. |.|  
  
|.  
.|  
|.  
  
|.. ..|  
.|. .|.  
..| |..  
  
|- ||  
|| |.  
  
especially striking (to me) is a sequence of four consecutive frames where the bflies alternate between the first two triangular formations.! :d  
  
trying to follow one bfly during a complete 36 frame long loop is also fun :d it makes several loops inside 2x2 and 3x2 rectangles!  
  
next episode: the last new dfs my brother's engine has found so far - a 6fly dfs which is visually especially striking! be curious guys... :d

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2022-09-02 17:54 dustin  
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btw i intentionally slowed down the cave speed to make it easier to follow the flies! :d