3D composition shows up as 2D in main project view? Camera
[comp 3D]
  ellipse mask in z-axis
  layer1 2D
  layer2 2D
  layerN 2D


The layers are aligned in the Z-axis along the ellipse, forming a 3D text by the layers.
When I'm inside the composition, I can actually see a aligned layers in the 3D space.

But when I go to my main project view just seing the "comp 3D" layer, everything is plain 2D! Also moving the camera I can just see a plain 2D image, even though inside the comp it is 3D. Why?

Update:


There are 3 lights being aligned differently in the z-axis (see TOP view).

When I move a camera around inside the "light comp", everything is fine and I can see also my lights moving.

When I move the camera in my main layout, the lights are static! No movement is reflected to the light comp layer! I can just see the camera mask moving, not the comp content.
You need to click the Collapse Transformations (sun icon) on your [Comp 3D] layer.
Otherwise your main comp will treat your other comp as a flat layer in a 3D space, if that makes sense?