On 17/11/10 23:11, bodzette Coignet wrote:
So here's a question:
If I want to make an NPC move I need to know which orientation an NPC has and
what way I want it to go.
So I can pretty much understand a Vector 3 which would be move in the direction
of +/- for x,y,z where x is left-right?,
y is back-forward? and z is up-down?
But quaternions I'm having a hard time getting my head around and I have a hard
time coding something when I don't
understand what it is.
Is it some representation of rotation in 3D similar to the vector but for
rotation instead?
Is it measured in the naively intuitive +/- 0-360 degrees for each of x,y, z or
is it measured in something more
esoteric like radians or something else entirely?
Anyone give me a quaternions-for-dummies elevator speech run-down so I know
what I'm working with?
Unfortunately I can't do that but I do suggest taking a look at the LSL
quaternion/rotation conversion functions, such as
http://lslwiki.net/lslwiki/wakka.php?wakka=rotation
I'm finding that
http://www.amazon.co.uk/Quaternions-Rotation-Sequences-Applications-Aerospace/dp/0691102988/ref=sr_1_1?ie=UTF8&qid=1290040061&sr=8-1
is a good book for understanding these issues, if a little pricey (don't ask me any questions, I haven't got to the good
bits yet!)
--
Justin Clark-Casey (justincc)
http://justincc.org
http://twitter.com/justincc
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