The end of the paper points to https://github.com/holomorpheus/topological-flips
I tried cloning it and running it but I'm missing a module; there is no requirements.txt either. :(
Skateboard Tricks and Topological Flips
11–20 of 67 posts
Re: Skateboard Tricks and Topological Flips
#12Earlier quoted context omitted.
Not really, the flipping maneuver remains the same, the stance is more of a modifier. A 360 flip and a switch 360 flip are both still just 36 flips, you’re just facing a different way in each.
They specifically talk about "left handed" rotation for a kickflip and a heelflip being right handed. However for a goofy skater, the opposite is true.
The mechanism for a kick flip and a heel flip are different, it’s not about the spin of the board in relation to the earth, it’s the spin of the board in relation to the skater.
A kick flip uses the front toe to rotate the board towards the skater. A heel flip uses the front heel to rotate the board away from the skater (you’re basically pushing it away from you by sliding your heel up and out off the edge of the board).
Re: Skateboard Tricks and Topological Flips
#13I really like the phrase "quaternionic varial kickflip".
Like something from Snow Crash.
Re: Skateboard Tricks and Topological Flips
#14So what are the 4 tricks? Kickflip, heelflip, flip + shove it in the "natural direction" (e.g. varial kickflip, 360 kickflip), and flip + shove it in the unnatural direction (e.g. hard flip)?
I'm guessing it's kickflip, heelflip, bs shuv, and fs shuv.
Your definition leaves out varial heels and inward heels.
Edit: On second thought I'm still not sure, I saw this in the paper, and I'm guessing they're classifying both direction shuvs as the same, and kick/heelflip as the same
Below we list these four tricks with their corresponding residue class in Z/4Z.
0 ↔ Ollie
1 ↔ 180 Shove-it
2 ↔ 360 Shove-it
3 ↔ 540 Shove-it
Another interesting choice of representatives is given by a combination of the shove-it and the kickflip.
0 ↔ Ollie
1 ↔ 180 Shove-it
2 ↔ Kickflip
3 ↔ Varial Kickflip
Re: Skateboard Tricks and Topological Flips
#15Re: Skateboard Tricks and Topological Flips
#16Generated the animations from the repo linked in the paper: https://imgur.com/a/SJcAvHF
The specific tricks with their matrices are here: https://github.com/holomorpheus/topological-flips/blob/main/...
Re: Skateboard Tricks and Topological Flips
#17The end of the paper points to https://github.com/holomorpheus/topological-flips
I tried cloning it and running it but I'm missing a module; there is no requirements.txt either. :(
It needs a handful of libraries. I generated the animations here: https://imgur.com/a/SJcAvHF
Re: Skateboard Tricks and Topological Flips
#18Generated the animations from the repo linked in the paper: https://imgur.com/a/SJcAvHF The specific tricks with their matrices are here: https://github.com/holomorpheus/topological-flips/blob/main/...
Not sure why these are considered different in the images
360 Pop Shove-it
360 Shove-it
360 Shuvit
Re: Skateboard Tricks and Topological Flips
#19I was hoping they would come up with a mathematical way to distinguish an impossible from a 360 shuv :)
Re: Skateboard Tricks and Topological Flips
#20Generated the animations from the repo linked in the paper: https://imgur.com/a/SJcAvHF The specific tricks with their matrices are here: https://github.com/holomorpheus/topological-flips/blob/main/...
Not sure why these are considered different in the images 360 Pop Shove-it 360 Shove-it 360 Shuvit
I always thought the difference is with a normal shove-it the board pivots on the back trucks, whereas with a pop shove-it all wheels are off the ground for the rotation. They seem to be depicting only the latter in the animations.