Using scripting in expressions

[pixelsklave]

i recently switched to xsi . while trying to figure out scripting in xsi , i wrote a small test script.
this script rotates a bone depending upon another bone's rotation .

                       my basic doubt is whether we can use 

vbscript & jscript in expression editor ?

   now i explain it  more specifically .


             dim a,b 
             a = GetValue ( "bone1.kine.global.rotz")
             b = a- 40 
             SetValue "bone1.kine.global.rotz",b 


                        this works fine from script editor. but

once i put this in expression editor, it shows error
" variable not defined or empty "

                            are variables ,loop constructs not

available for expressions ?

                                  what do i do if i wish to run this 
 code everyframe ,so that the "b" value will be updated  every frame ?  
                          (  say  ,  i wish to add secondary motion  to tails or ears based on main character movement     

               can i do it  through  expressions .because i can  do it in maya in this way.

         thanx in advance .

[devdoka]

loops are implied with the expression editor. If you need to reference the current frame, then use the 'Fc' (Frame current) variable.

As far as your example is concerned, you're reading and writing to the same parameter - that's an illegal expression. To get the offset effect displayed in your example, try this:

bone.kine.globa.rotz = bone1.kine.global.rotz - 40

The left side of the expression is the affected parameter shown at the top of the expressions PPG and not explicitly typed into the editor.

If you want to use script over a sequence of frames, then you need to use scripted operators, not expressions. Details in the animation manual.

Matt

---

Matt Lind
Animator / Technical Director
Softimage certified instructor:
Softimage|3D
Softimage|XSI
speye_21@hotmail.com

[door]

Try to use script operate editor with Object Model