Using Python Scripting to set a Zero key on selected object

[vdebaie]

Hi! I'm a long-time lurker, first-time poster.

I am trying to create a script that will add a "Zero" key to my selected object.

I have about 10 days of MotionBuilder python experience and I am a bit stuck trying to figure out how to use  FBAnimationNode and 

FCurve within python.

The supplied examples and google searches are bringing me little help.

Thanks. 

[jps · Accepted solution]

There are several ways to approach the problem.

Setting a key with a value of 0 on the fCurve. This will work like using the Zero Key button in the Keys Controls:

from pyfbsdk import *

def setTRKeyToZero( yourObject, currentTime 😞

    yourObject.Translation.SetAnimated(True) # make sure translations are "animatable"

    yourObject.Translation.GetAnimationNode().Nodes[0].FCurve.KeyAdd(currentTime,0)  #Node[0] is X, [1][ is Y, [2] is Z

    yourObject.Translation.GetAnimationNode().Nodes[1].FCurve.KeyAdd(currentTime,0) #  the last 0 is the key value

    yourObject.Translation.GetAnimationNode().Nodes[2].FCurve.KeyAdd(currentTime,0)

    yourObject.Rotation.SetAnimated(True)

    yourObject.Rotation.GetAnimationNode().Nodes[0].FCurve.KeyAdd(currentTime,0)

    yourObject.Rotation.GetAnimationNode().Nodes[1].FCurve.KeyAdd(currentTime,0)

    yourObject.Rotation.GetAnimationNode().Nodes[2].FCurve.KeyAdd(currentTime,0)

lPlayer = FBPlayerControl()

currentTime = lPlayer.GetEditCurrentTime()

selectedModelList = FBModelList()

FBGetSelectedModels( selectedModelList )

for selectedModel in selectedModelList:

    setTRKeyToZero( selectedModel, currentTime )

On other way will be to directly move the object and create a key using the transport control:

from pyfbsdk import *

def zeroTRTransforms( yourObject 😞

    yourVector = FBVector3d( 0, 0, 0 )

    yourObject.SetVector (yourVector, FBModelTransformationType.kModelTranslation, False) # False for local transform, True(default) for global transform.

    yourObject.SetVector (yourVector, FBModelTransformationType.kModelRotation, False)

lPlayer = FBPlayerControl()

selectedModelList = FBModelList()

FBGetSelectedModels( selectedModelList )

for selectedModel in selectedModelList:

    zeroTRTransforms( selectedModel )

    lPlayer.Key()

A symplified version were it's always a local tarnsform.

from pyfbsdk import *

def zeroTRTransforms( yourObject 😞

    yourObject.Translation = FBVector3d()

    yourObject.Rotation = FBVector3d()

lPlayer = FBPlayerControl()

selectedModelList = FBModelList()

FBGetSelectedModels( selectedModelList )

for selectedModel in selectedModelList:

    zeroTRTransforms( selectedModel )

    lPlayer.Key()

Sometimes you will need to use FBSystem().Scene.Evaluate() after changing the transforms of an object to make sure current transforms values are updated.

[vdebaie]

Thanks jps. I will give this a try. 🙂