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 Post subject: Worst Rubik's Cube animation ever?
PostPosted: Sun Aug 14, 2011 1:16 pm 
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Joined: Mon Mar 30, 2009 5:13 pm
I just saw this and had to laugh. :lol:

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 Post subject: Re: Worst Rubik's Cube animation ever?
PostPosted: Sun Aug 14, 2011 1:24 pm 
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AH.
it's late but you made my day with this.
Come on, you made that for a joke.
I mean why does the middle layer get a seizure und why does the top center rotate? :lol:

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 Post subject: Re: Worst Rubik's Cube animation ever?
PostPosted: Sun Aug 14, 2011 1:35 pm 
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No, that was certainly not me. The real funny thing is that the comments say this was his 1000th attempt! :lol:

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 Post subject: Re: Worst Rubik's Cube animation ever?
PostPosted: Sun Aug 14, 2011 1:44 pm 
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Location: The land of dreams, coincedentally located in Alberta
That was actually one of Oskar's puzzles-under-construction (the Seizure Cube, which would have been available for $374 on Shapeways), but it gained sentience after a freak lab accident and ran away, only to end up being filmed and mocked.

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 Post subject: Re: Worst Rubik's Cube animation ever?
PostPosted: Sun Aug 14, 2011 1:47 pm 
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Location: Los Angeles
There's two things that are happening:
Each piece has a rotation in X, Y, and Z between 0 and 360.
However, when you move the pieces by hand, a rotation of 360 gets changed to 0.
So Those pieces are rotating backwards 270 degrees when they should rotate forward 90.

Also, there's something called "Gimbal Lock".
(http://www.youtube.com/watch?v=zc8b2Jo7mno, watch the video for a good visual explanation)
The way Euler rotations work, you first rotate something in the object's X axis, then the Y, then the Z.
The problem is that when you rotate along the X axis, the Y and Z axes rotate along with the object. And if you rotate the Y axis, the Z axis follows the object but the X doesn't. Most of the time, this doesn't cause a problem.
However, if you start with a 90 degree rotation in Y, you make it so that the X and Z axes are pointing the same direction. So with the X and Z pointing the same direction, and the Y pointing a second direction, there's no axis to twist for the third direction.
There's something called a quaternion rotation that fixes that problem. Unfortunately the numbers aren't really intuitive.


Last edited by TBTTyler on Sun Aug 14, 2011 1:53 pm, edited 1 time in total.

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 Post subject: Re: Worst Rubik's Cube animation ever?
PostPosted: Sun Aug 14, 2011 1:51 pm 
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Interesting, but it's completely ruined all the fun. :lol: :arrow: :|

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 Post subject: Re: Worst Rubik's Cube animation ever?
PostPosted: Sun Aug 14, 2011 2:02 pm 
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Sorry. I tend to take a long time to write my replies. Everybody started having fun while I was still searching for a good youtube video ;)
I tried to animate a 3D Rubik's cube at one point in college, and that exact problem showed up.


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 Post subject: Re: Worst Rubik's Cube animation ever?
PostPosted: Sun Aug 14, 2011 2:04 pm 
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Hey no worries, i did find your post very interesting, and also your video link. :D

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 Post subject: Re: Worst Rubik's Cube animation ever?
PostPosted: Mon Aug 15, 2011 8:26 pm 
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I personally think this is the worst Rubik's Cube animation ever.

http://www.youtube.com/watch?v=LYs_GCy9PRk


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