Are you sure you need the guy to parent to the ladder?
What about linking the guys position + scale to the ladder, but its rotation to the floor?

Cheers,
Mathias


Am 24.03.2013 00:00, schrieb After Effects Mail List:

Message-ID:<514DC5A0.1030904@gmail.com>
Date: Sat, 23 Mar 2013 16:09:20 +0100
From: =?ISO-8859-1?Q?S=E9bastien_P=E9rier?=<yenaphe@gmail.com>
Subject: Rotation Expression Problem

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

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