Setdrivenkey Help

[megamanzz]

What i was hoping to achieve with the below code is that myCube's translate.Y would follow mySphere's translate.Y in the range of 0-10.

so if mySphere translate.Y is between 0 and 10, myCube's translate.Y will match.

CODE
import maya.cmds as cmds

cmds.select( all=True )
cmds.delete()

cmds.polySphere( name='mySphere' )
cmds.move(  2,0,0, r=True)

cmds.polyCube( name='myCube' )
cmds.move(  -2,0,0, r=True)

cmds.setDrivenKeyframe( currentDriver='mySphere.translateY',
        driverValue=0,
        attribute='myCube.translateY',
        value=0 )

cmds.setDrivenKeyframe( currentDriver='mySphere.translateY',
        driverValue=10,
        attribute='myCube.translateY',
        value=10 )

I'm not sure how to make this work. I did read up on it,but had little luck.

[akjones]

Try this instead:

[codebox]
import maya.cmds as cmds

cmds.file (force= True, new=True)

cmds.polySphere( name='mySphere' )
cmds.move( 2,0,0, r=True)

cmds.polyCube( name='myCube' )
cmds.move( -2,0,0, r=True)

cmds.select ('myCube')
cmds.setDrivenKeyframe( currentDriver='mySphere.translateY',
driverValue=0,
attribute='translateY',
value=0 )

cmds.setDrivenKeyframe( currentDriver='mySphere.translateY',
driverValue=10,
attribute='translateY',
value=10 )
[/codebox]

[megamanzz]

that answers that question, thank you very much..
What would i put in the 'attribute' section if i was dealing with parent constrain values?

example:

CODE
import maya.cmds as cmds

cmds.polySphere( name='mySphere' )
cmds.move(  2,0,0, r=True)

cmds.polyCube( name='myCube' )
cmds.move(  -2,0,0, r=True)

cmds.parentConstraint( 'mySphere', 'myCube', mo=True, weight=1 )

cmds.setDrivenKeyframe( currentDriver='mySphere.translateY',
        driverValue=0,
        attribute='myCube_parentConstraint1.mySphereW0',
        value=0 )

cmds.setDrivenKeyframe( currentDriver='mySphere.translateY',
        driverValue=1,
        attribute='myCube_parentConstraint1.mySphereW0',
        value=1 )

[uiron]

it's safer to get " weightAliasList" to get weighting channel names instead of predicting them

CODE
# create constraint
constraint = cmds.parentConstraint(...)

# retreive channel names
weights = cmds.parentConstraint(constraint,q=True, weightAliasList=True)

# use them
cmds.setDrivenKeyframe(......,attribute=constraint+'.'+weights[0])

[megamanzz]

VERY COOL urion!!!!

I just tried to implement the code that 'urion' supplied and it seems to not work well with the orginization that my current code has. This is not a big deal, but it would be preferable if i could retrieve the channel names of an already created parent constraint.
I understand that this might not be the proper way of coding, but i am pretty far into the coding and it would require a lot of changes that i don't have time to make.

So the main question is: Is there a way to retrieve the channel names and use them for a pre-existing constraint and be able to use it in setDrivenKey's?

[megamanzz]

I'm still trying to get everything working..... my code looks something like this now

CODE
import maya.cmds as cmds

#cmds.file (force= True, new=True)
cmds.select( all=True )
cmds.delete()
cmds.polySphere( name='mySphere' )
cmds.move( 2,0,0, r=True)

cmds.polyCube( name='myCube' )
cmds.move( -2,0,0, r=True)

# create constraint
constraint = cmds.parentConstraint('mySphere', 'myCube', mo=True, weight=1 )

# retreive channel names
weights = cmds.parentConstraint( constraint,q=True, weightAliasList=True )

# use them
cmds.setDrivenKeyframe( currentDriver='mySphere.rotateY',
        driverValue=90,
        attribute=constraint[0]+'.'+weights[0],
        value=0 )

cmds.setDrivenKeyframe( currentDriver='mySphere.rotateY',
        driverValue=0,
        attribute=constraint[0]+'.'+weights[0],
        value=1 )

so from my understanding when the sphere rotates 90 degrees on Y the parent constraint should turn off, but it remains on?
I might be doing something really dumb and not knowing it.. does anyone know whats going on?