[Opensim-users] NPCs: Quaternions and Vector3?

[bodzette Coignet]

Thanks Justin, I think I have more than enough to get the answer, lol....




On Wed, Nov 17, 2010 at 5:28 PM, Justin Clark-Casey <
jjustincc at googlemail.com> wrote:

>  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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