Here's a question for you - say I have three layers side-by-side in a 3D flythrough scene. I want to group them together as a unit so they move together. I have two options: either I pre-compose them with "leave transforms in composition" grayed out, so that I have to turn on the collapse transforms button on the precomp to bring them back into the main comp's 3D space. Or, I have to precompose without the collapse transforms, turn on the precomp's 3D switch, then have to bring the precomp back to the correct coords manually. And if I do the former method, that precomp is itself a 2D comp, so I can't manipulate the layers together in 3D space. I have to go into the precomp and change the layer's z-position without any reference to the master scene. If I then proceed to turn the 3D switch back on for the collapsed precomp in the main comp, the coords are all messed up and anchor point is in the wrong place. I'm sure this is totally confusing but I don't know how to better explain it.
Am I missing something? I think basically I'm wondering why the "leave transforms in current comp" button is unavailable when selecting and precomping multiple layers. Sometimes I just want to precomp as a method of grouping layers together instead of parenting, while leaving 3d axis controls and coords in the master comp.Â