Hi Peter,
as far as I see it your result is correct? The resulting vector should be
* [0.0, 0.0, -1.0]* - which is effectively the result of your print
statement.
in your example *vec.Y* has a value of *6.12323399574e-17* which
essentially is *0.0* (due to floating point math precision).
So all is fine - or did I not get your point?
Cheers, Martin
--
Martin Chatterjee
[ Freelance Technical Director ]
[ http://www.chatterjee.de ]
[ https://vimeo.com/chatterjee ]
nbsp;]
On Thu, Feb 21, 2013 at 3:21 PM, Peter Agg <[email protected]> wrote:
> (and yes, rotating [0, 1, 0] by [-90, 0, 0] should actually make make [0,
> 0, -1]) :)
>
>
> On 21 February 2013 14:15, Peter Agg <[email protected]> wrote:
>
>> Hey all,
>>
>> I'm trying to rotate a vector in a Python Script and seem to be running
>> into an odd block. For example: I want to rotate the vector [0, 1, 0] by
>> [-90, 0, 0], which should make [-1, 0, 0] (and does so if I test in ICE
>> using a Rotate Vector node) but I can't seem to work out how to do this via
>> scripting.
>>
>> What I tried:
>>
>> vec = XSIMath.CreateVector3(0, 1, 0)
>> rot = XSIMath.CreateRotation(XSIMath.DegreesToRadians( -90 ),
>> XSIMath.DegreesToRadians( 0 ),
>> XSIMath.DegreesToRadians( 0 ))
>> vec.MulByRotationInPlace( rot)
>> print vec.X, vec.Y, vec.Z
>> # 0.0 6.12323399574e-17 -1.0
>>
>> ...which makes me think that I've misunderstood what MulByRotation does!
>>
>> Any ideas?
>>
>
>
