Can you parent and then unparent a linked null mid movement? Trying to use JetStrike from Element 3D

You parent the Null to the aircraft as a reference for the mounting point. The expression is applied to the rocket's position, which isn't parented to anything.

Mylenium 

Hey Mylenium,

Thanks for the quick reply! I'm going to try this out. I'm not super familiar with expressions lingo, but I was curious about the following statement you made:

"You parent a Null to the jet in place of the rocket and then add some sort of slider to blend between positions"

Are you saying to create a Null object, create a layer with a Slider Control, and then parent the rocket to the slider control?

I'm trying to think of this in these types of terms to help me understand the concept better. I'm going to try this and see how it goes.

And thanks, I really appreciate the help!

You wouldn't do any of that. You simply change your setup. You parent a Null to the jet in place of the rocket and then add some sort of slider to blend between positions. Something like this perhaps applied to the position of the rocket:

mNullRef=thisComp.layer("Null");
mNullWld=mNullRef.transform.position.toWorld(mNullRef.transform.anchorPoint);

mBlend=thisComp.layer("Controller").effect("Rocket Blend")(1);

X=linear(mBlend,0,100,value[0],mNullWld[0];
Y=linear(mBlend,0,100,value[1],mNullWld[1];
Z=linear(mBlend,0,100,value[2],mNullWld[2];

[X,Y,Z]

Adjust the references as needed. Can contain errors, as I'm typing this on the fly.

Mylenium