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Quaternions
show user profile  3joez
The most obscure topic on 3d graphics. Is there somebody knowing something about it and willing to share a simple explanation?
I just know they represent a rotation. That's it.
Photobucket

read 509 times
11/7/2014 10:17:54 AM (last edit: 11/7/2014 10:17:54 AM)
show user profile  reeves1984
In what context - Im sure context is irellevant to your actual question, but I'm curious..

I know some of the basics when it comes to vector maths from doing stuff in ICE in xsi... It has been good to learn those fundamentals..

Here it is in ICE, so its a vector with an angle.....Like a roll on a camera...

https://www.dropbox.com/s/za7sz3yc69b2s14/Screenshot%202014-11-07%2010.03.10.png


--
Simon Reeves


www.simonreeves.com - VFX Artist & Blog
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www.analogstudio.co.uk <-- I work here

read 506 times
11/7/2014 10:56:31 AM (last edit: 11/7/2014 11:04:07 AM)
show user profile  LionDebt
From what I've gathered through Unity development...

1. A quaternion is just a compact way of representing a rotation.
2. They can easily be interpolated and don't suffer from gimbal lock.
3. They are based on complex numbers (which leads into 4.)
4.The mathematics involved is mind boggling - so quaternions are (pretty much) never modified directly.
5. Luckily they are used internally in Unity and we can access rotations with euler angles which are much easier to understand.
6. Quaternions were first described by an irish mathematician... Which, really, goes to show how incomprehensible they are.
read 481 times
11/7/2014 2:34:21 PM (last edit: 11/7/2014 2:34:21 PM)
show user profile  Mr_Stabby
A quaternion is 2 vectors in 2d space that form 1 vector in 3d space. Not really made for human consumption, its popular because its easy to handle by matrices (what modern gpu's are hardware optimized for). Anything a quaternion can represent, a xyz can just as well.

read 466 times
11/7/2014 6:28:17 PM (last edit: 11/7/2014 6:28:17 PM)
show user profile  K-tonne
there you go:


Website and Portfolio

read 465 times
11/7/2014 6:33:28 PM (last edit: 11/7/2014 6:33:28 PM)
show user profile  Octopuzzy
Ask the almighty Youtube..they have a bunch of videos attempting to explain quaternions..one of em might bite.




read 462 times
11/7/2014 6:55:52 PM (last edit: 11/7/2014 6:55:52 PM)
show user profile  aca88
You can find a complete explanation of quaternions in this
phd:
http://characters.media.mit.edu/Theses/johnson_phd.pdf

By the way, quaternions are much more simplified when
used in 3d graphics, than they are actually used in math.

read 418 times
11/10/2014 8:45:44 AM (last edit: 11/10/2014 8:45:44 AM)
show user profile  3joez
Thanks aca,88 I'll stick to quaternions. Then I'm waiting for a tutorial to use sedenions in cg...
Photobucket

read 381 times
11/13/2014 11:42:32 AM (last edit: 11/13/2014 11:42:32 AM)
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