Having a Null follow layer rotation in 3d space

[Bad Prop Gun Productions]

So, I honestly cannot figure this one out. I have even delved as deep as I felt safe in doing into expressions before coming here and searching for an answer. Alas, I have not found one, so here is my question:

Let's say I have a composition with a single layer that contains an image (we'll say its dimensions are 100x100). I have made it a 3d layer.

Next, I set the image layer to rotate on it's Y axis 360 degrees in ten seconds.

Next, I added a null object (also 3d).

What I am trying to accomplish is to have the null object attach to the lower left corner of the image layer and follow it on its rotation, affecting its position on the x and z axis as the image layer spins. Is this possible? I may be overlooking a simple solution, but I have sat at my system for over four hours trying to get this one thing to work, and nothing I do is working. Thanks in advance, and if I have overlooked an answer already in the forum, if you could point me to it with a link I would appreciate it. Thanks again.

[ScooterD76 · Accepted solution]

Heres how I got it to work...

I made my solid ( in place of your photo) and did the rotation. Next I added the Null, made it a 3D layer, then used the parent whip-stick thingie ( see screenshot) Drag the null's whip to the solid's. The null is in the center so you can use the x and y transformers to move it to the corner and it will follow accordingly.

[Bad Prop Gun Productions]

I was SO over-complicating things with this. Thanks for the quick reply!

[ScooterD76]

No problem! Null objects are commonly used like this in (actual) 3D programs for parenting and resetting transformations, etc...