The List3D is organised in l3dsets, every set contains multiple layers. You can render the same set from different l3dviews. One default l3dview always exists per l3dset. Each l3dset has its own sun. particlesystems and particleclouds are rendered at the end of every l3dset. Every l3dnode requires a l3dlayerid, directly or indirectly via defaults. l3dsets are independent from each other, and l3dnodes can only be rendered in one l3dset. By default 0-2 are disabled.
l3dsets are renderd in this order: 0,1,2,3.
o-+ l3dlist o-+ l3dset