What u r talking is right. But what do u think after seeing my comp images?
Have a look at my images.
U can see that the 3D tab being selected for logo layer, still its nt aligning in 3D with particl layer.
I wil be shortly uploading 2 videos for demo.
In the image where you get the AE warning, turn off 3D for the layer. Particle emitters like CC Particle World and Particular, use AE's 3D space, can interact with cameras, but they are not true 3D effects. Just for an example enable 3d on a CC Particle layer, twirl open your rotation and rotate the X axis. It becomes flat, because it's not really 3D.
It's that limitation why your second picture the logo and particles are not interacting correctly. You can use the camera to get the particles to rotate with the logo. But based on the layer stack, the particles will always be on top of the logo.
If you use trapcode particular, you can set the logo layer as an obscuration layer and particular will look at it's position in Z space and block out the particles behind it. It also has other methods for turning off particles based on position in Z-space.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.