# .font: font.text_2
2022-08-16 17:35 dustin  
# .font: font.text_1
in "funny flies 20", butterflies are forced onto a big rectangular path only with the help of other blocking butterflies.   
  
now i wonder if it's also possible to force bflies onto a rectangular path only with blocking fflies? :d  
  
but there are several new problems with that idea:  
  
| first of all, there's a kind of "parity problem" with the loop length of the bflies. if ffly vortices are used for the blockades (and what else?), then the side lengths of the rectangle are even numbers, which means that the whole perimeter of the rectangle is divisible by 4. if we add the two frames where the bflies must halt, then the whole loop length is always an even number but not divisible by 4.   
on the other hand, the looping fireflies which stop the bflies for one frame have a loop length of 4, which does not fit with the butterflies' loop length.  
  
a special cso effect makes it possible to solve this problem by adding two additional halts to the bflies' path (see left side). now the loop length of the bflies is divisible by 4 and everything looks fine.  
  
except it doesn't.  
  
unfortunately, the very same cso effect makes it impossible to block the bflies with ffly vortices at the right side. the bflies would always break into the vortices! that's why i used bflies there, which of course i didn't want to do, but there seems to be no other (simple) possibility.   
  
all in all, the challenge is almost possible but the cso problem at the right side is quite not an easy nut to crack (if even possible).  
  
the next two "funny flies" episodes will be about the reverse challenge: trying to force fflies onto rectangular paths only with the help of bflies! :d

# .font: font.text_2
2022-08-16 17:43 dustin  
# .font: font.text_1
and btw, i've got one more 5-fly dfs to show (one more result by my brother's computer search so far) - it's a really crazy one! just as an appertizer to make you curious... :d

# .font: font.text_2
2022-08-16 18:03 dustin  
# .font: font.text_1
i forgot to mention why the parity problem did not occur in "funny flies 20" - there the bflies moved i n t o the vortices at the left side, which means that their loop length is then a multiple of 4! :d  
  
but this idea does not work with flies of different genders...

# .font: font.text_2
2022-08-16 18:04 DarkStoorM  
# .font: font.text_1
I was actually wondering if you can somehow convert FF20 cave to fireflies. I tried to experiment some, but I couldn't figure out just one corner, they kept breaking the belt. :D my attempt was to keep the same exact positioning, except I had to rotate the cave to the right and flip horizontally, then change fly directions, such as:  
  
- BFly Up/Down became FFly Left/Right  
- BFly left/right became ffly up/down  
  
I believe these were the steps, I can't check it anymore as I deleted the test cave :D

# .font: font.text_2
2022-08-16 18:58 dustin  
# .font: font.text_1
 darkstoorm , it was the bottom-right corner that troubled you, correct? there's a cso problem in that corner if fireflies are used. it would be possible, however, if you use butterflies at the right side and fireflies everywhere else.

# .font: font.text_2
2022-08-16 18:59 DarkStoorM  
# .font: font.text_1
Yep, it was that corner :D

# .font: font.text_2
2022-08-16 19:04 dustin  
# .font: font.text_1
just as in this cave here, only with fireflies in the outer circle, and with some small adaptions.

# .font: font.text_2
2022-08-16 22:40 dustin  
# .font: font.text_1
see "funny flies 22" now :d