How to make a line between 3D elements (with DOF)

Hello,

so I have these elements in 3D space (layers). And I want to connect them with a line.

My approach was this:

1. Draw a line path (shape layer)

2. Make it 3D

3. Use the "Create Nulls from Paths" script and create Nulls for the individual points of the path

4. Make the Nulls 3D

5. Link the Nulls' position to the position of the elements I have in 3D space

This seems to work until I enable DOF on my camera. Then all the elements get blurred but not the path strokes.

I had a look from the top and I saw the layer with the paths was plane and had no depth. It is some kind of a fake 3D effect with them. That is why there is no DOF. I guess that is the reason for Trapcode 3D Stroke to exist.

I attached an example of what I want to create here. I assume that the brain was done using Trapcode Form. But I have no idea how to add the lines that connect the elements (in this case with the brain) in a real 3D space.

Another thing that just came to my mind was that it might have been done with Stardust.

Any Ideas?

Thanks, Daniel