This is driving me nuts. I want to have a stroke around an object in 2D space. Can I apply 3D stroke so that I can then turn that 2D object into a 3D object. All I want 3D stroke to do is continue to outline the 2D plan object as it is now a 3D object. Too confusing?
I just want to control the 3D rotation and postion of the outline by the controls of the layer's 3D rotation and position, not 3D stroke's controls. Keep my object outlined and allow me to control how fast the line travels but I'll use AE's controls of the layer to make the full object move.
Is this not possible?
You can do what you are asking, but it is not as simple as applying 3d stroke to your image and then manipulating the image in 3d space.
3d Stroke only works in 3d mode on 2d layers. If you change the layer to 3d, stroke will stay, but be a 2d outline like you drew a line on the layer.
To do what you want, you need to have the layer you want to outline as a 3d layer. Next, outline the part of the picture you want stroked. Duplicate the layer. Turn the layer into a 2d layer. Apply 3d stroke to the new layer. Under the 3d stroke settings "camera" make sure the use comp camera option is checked. Create a new camera and new 3d null object. Parent the camera to the null. Picwip the 3d stroke position to the the null position. Now simply move and animate the null and everything should line up just fine.