You will probably need to use the toWorldVec() layer space transform somewhere and perhaps add another Null somewhere inbetween. Impossible to say exactly without seeing the exact setup. The lazy way would be to use a lookAt() expression on teh 3D Orientation property and let it target an "Up Vector" layer:

 

http://www.motionscript.com/design-guide/auto-orient-y-only.html

 

Mylenium

 

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> Sébastien Périer <yenaphe@gmail.com> hat am 23. März 2013 um 16:09 geschrieben:
>
>
> Hi everyone,
>
> I'm struggling with a project right now and can't seem to find the
> appropriate orientation / rotation expression.
>
> In this project I have 3 layers, the floor, the ladder and the guy.
>
> I have to keep the guy perpendicular to the floor. But the guy layer is
> parented to the ladder, and the ladder is animated on all it's rotation
> axis (imagine a flying carpet, but looking like a ladder).
>
> I can't seem to find the correct expressions to keep the guy
> perpendicular to the floor (which can also be animated on it's
> orientation/rotation axis) in all cases. The guy parenting to the ladder
> adds a lot of complication that my non-math-friendly head can't seem to
> overcome.
>
> Any hint ?
>
> Cheers,
>
> Seb
>
> +---End of message---+
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