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I was hoping they would come up with a mathematical way to distinguish an impossible from a 360 shuv :)
“I know it when I see it” (maybe)
Generated 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
A pop shuvit will be higher while a non-popped shuvit may barely leave the ground. Popping can actually make it easier to keep the axis of rotation closer to the center of the board.
Earlier quoted context omitted.
Not sure why these are considered different in the images 360 Pop Shove-it 360 Shove-it 360 Shuvit
Popping, i.e. hitting end of the board on the ground, to get height is the difference. A pop shuvit will be higher while a non-popped shuvit may barely leave the ground. Popping can actually make it easier to keep the axis of rotation closer to the center of the board.
Also "shuvit" distinction is just a synonym
Is it? Isn't a hardflip just a mirror of the varial kickflip they describe, and rotation around their x-axis something else entirely?
I was hoping they would come up with a mathematical way to distinguish an impossible from a 360 shuv :)
I don’t know about mathematical, but I’ve always thought of it as a vertical vs horizontal motion with the front foot used as as kind of rotation axis for an impossible… “I know it when I see it” (maybe)
Correct me if I'm wrong, but the whole beginning of the article implies that the skateboarder is "regular" in terms of foot placement, meaning the right foot is on the tail and the left foot is at the front. The fact that each skater can reverse their stance (aka switchstance), doesn't that double the possible number of flip tricks?
It’s the same trick but you essentially have to relearn it with your other “hand”. Tricks are then flagged with the “switch” qualifier to indicate the rider wasn’t in their normal stance. Example: a regular (footed) skater skating right foot forward (switch) doing a kickflip is simply doing a switch kickflip (switch flip).
> As a last example we will describe the hardflip. This is a simultaneous half kickflip (a 180 degree rotation about the axis joining the tail to the nose of the skateboard) and a 180 degree rotation about the x-axis in the right-hand orientation. Is it? Isn't a hardflip just a mirror of the varial kickflip they describe, and rotation around their x-axis something else entirely?
The problem comes around that your front foot is very much in the way of the board if it is only doing an "inverse varial". The vertical (end over end) rotation comes out of necessity to get the front foot out of the way.
Plus it looks really cool.
> As a last example we will describe the hardflip. This is a simultaneous half kickflip (a 180 degree rotation about the axis joining the tail to the nose of the skateboard) and a 180 degree rotation about the x-axis in the right-hand orientation. Is it? Isn't a hardflip just a mirror of the varial kickflip they describe, and rotation around their x-axis something else entirely?
It both is and isn't. Technically the rotation is just the inverse of the varial kickflip (a frontside varial kickflip as opposed to the "normal" backside varial kickflip"). The problem comes around that your front foot is very much in the way of the board if it is only doing an "inverse varial". The vertical (end over end) rotation comes out of necessity to get the front foot out of the way. Plus it looks really coo…
I was hoping they would come up with a mathematical way to distinguish an impossible from a 360 shuv :)
> As a last example we will describe the hardflip. This is a simultaneous half kickflip (a 180 degree rotation about the axis joining the tail to the nose of the skateboard) and a 180 degree rotation about the x-axis in the right-hand orientation. Is it? Isn't a hardflip just a mirror of the varial kickflip they describe, and rotation around their x-axis something else entirely?
Hardflip = 180 frontside shuvit + kickflip
The hardflip is unique in that it has two main variations. One is the end-over-end style that I think they're describing, where the board only does half a kickflip. The other is "flatter," and explicitly a 180 shuvit with a complete kickflip. In practice the end-over-end style is much more common, easier to perform, and nicer looking.