Re: [script][5.11] Get difference between 2 rotations

[Vladimir Jankijevic <vladimir.jankijevic(at)frame-eleven.com>]

there is a function which does exactely this. it's named "SLERP" ( 
spherical linear interpolation)

'-----------------------------------------------------------
'create three nulls and rotate them how you like and then run the script

set n1 = dictionary.getobject("null")
set n2 = dictionary.getobject("null1")
set n3 = dictionary.getobject("null2")

set t1 = n1.kinematics.global.transform
set t2 = n2.kinematics.global.transform
set t3 = n3.kinematics.global.transform

set q1 = XSIMath.CreateQuaternion
set q2 = XSIMath.CreateQuaternion
set q3 = XSIMath.CreateQuaternion

t1.GetRotationQuaternion q1
t2.GetRotationQuaternion q2

q3.slerp q1,q2,0.5

t3.SetRotationFromQuaternion q3
n3.kinematics.global.transform = t3
'------------------------------------------------------

hope this helps

Bernard Lebel wrote:

> Hello,
>
> I'd need some guidance here. Say I have 3 objects. I want the third
> object to get the rotational difference between the first two.
>
> In a simplified example, the first object has rotx 25.0, the second
> has rotx 15.0, so I'd want the third object to get rotx of 10.0.
>
> I'm not sure at all where to go from there, using the XSI math
> objects. Do I have to perform a subtraction for every axis of the
> rotation?
>
>
> Thanks
> Bernard
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--
Vladimir Jankijevic
3D / Animation

frame eleven ag
Schiffbaustrasse 10
8005 Zurich

tel  +41-1-444 34 44
fax  +41-1-444 34 45

vladimir.jankijevic(at)frame-eleven.com

www.frame-eleven.com

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