Making Expressions Relative

[Steve Roberts]

If you pickwhip the rotation value of one layer to (say) the Y-position value of another layer, the rotation value will match the position value. The numbers will match. If the position value is 397, the angle will be 397.

So that’s how they work.

If your position values change, your rotational values should change. Given your stated result, I’d say you either used orientation (not rotation) or the position values didn’t change. Not sure though.

What is the result you want? (not the solution or the method)
Is there a range, where if position goes from 0 to 1094, you want the angle to go from 0 to 90?

[Larry Winters]

Thanks for responding.

Here’s what I’m trying to do:
I’m making a character animation. I have the character’s lip as one layer. I have key-framed this layer using only position key frames.

This layer is parented to a head a layer. I want to set the head layer’s rotation to the key frames from the lip layer.

I don’t know if this helps, but I am used to using Motion Math in older AE versions. In Motion Math I used the “copy relative values” script to achieve what I want. I think I just need to modify the expression so that it uses relative position/rotation instead of actual position/rotation.

Does this make sense?

[Mylenium]

Use the interpolation methods. Something like

linear(lips_position_Y,lips_min_position_Y,lips_max_position_Y,min_head_rotation,max_head_rotation)

This wil remap you linear motion values to rotation values. Just fill in the appropriate values and experiment a little.

Mylenium

[Pour Myl

[Larry Winters]

Hey, thanks. I have not had a chance yet to try this out due to visiting relatives. Hopefully, I will get to it tonight.