Thank you so much for the videos. I literally understood nothing during my Computer Graphics lecture. Now I finally understand what the hell a quaternion is!
@JorgeVinoRodriguez
8 жыл бұрын
My pleasure!
@julianaskuratovsky8701
Ай бұрын
this is awesome!! Thank you very much!
@Linck192
9 жыл бұрын
I'm confused about the order of this videos. If I look at the playlist, the very first video about quaternions is "Math for Game Developers - Rotation Quaternions", then the next one is this one I'm commenting on. But you said "we discussed last time about the identity quaternion", which I don't recall.
@JorgeVinoRodriguez
9 жыл бұрын
Linck192 Sorry - the unit quaternion is (1, 0, 0, 0). In this case theta = 0 and the axis of rotation is undefined. But it being undefined doesn't matter, since it doesn't do any rotation.
@markb5719
10 жыл бұрын
Good stuff, Mr. Rodriguez! Congrats! If I want to follow your lectures from "knows nothing" to "Expert", is there a guide somewhere showing the best viewing order? Thanks!
@JorgeVinoRodriguez
10 жыл бұрын
All of these videos are in a playlist that you can find on my profile :)
@markb5719
10 жыл бұрын
Jorge Rodriguez THanks!
@mariafonseca2405
7 жыл бұрын
Thank you! They are amazing videos. So probably today I'm too "slow" but the wheels are not rotating clockwise when the car is moving backwards? Which video can I understand more about the w? Thank you again!!!!
@JorgeVinoRodriguez
7 жыл бұрын
A very good question! The car analogy may have been the wrong analogy, maybe think of a unicycle instead. If the cyclist is pedaling 'forward' and going right, from your perspective the wheel is rotating clockwise. Then the cyclist turns around and is going left but still pedaling forward, the wheel is facing the other way so from your perspective it's now rotating counter-clockwise. But then the cyclist pedals backwards, and the wheel is still facing left, but is now rotating clockwise again. I think I explain the w in one of the introductory quat videos. It starts at 1 if there's no rotation and it continues as cos(angle/2), in other words it gets smaller as the rotation gets bigger.
@ravi78603
5 жыл бұрын
The last 3 seconds says there is transformation of vectors. cant find it easily
@anzatzi
10 жыл бұрын
One might wonder: "why theta over 2"? "why scale the axis of rotation"? Or "why have 2 videos on quaternions and not address the most obvious intuition issues"?
@dbuezas
10 жыл бұрын
You missed the first video in the series where he explains that this makes the vector's length to be 1, giving this representation very nice properties.
@DenisRizovBG
9 жыл бұрын
Hi Jorge, I really like your tutorials, but I am a little confused. Isn't this called a "Complex Conjugate" of a Quaternion, not an "Inverse" of a Quaternion?
@JorgeVinoRodriguez
9 жыл бұрын
(w, -v) would be the quaternion conjugate, yes. But inverses and conjugates aren't always the same thing, since (-w, v) also gives you an inverse.
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