In a 3D scene, filled with layers in the Z axis, I build a "city". Far away in the background, I have some smoke coming out of a cheminee. This was made using lights as emitters with particular.
I am having rendering issues.
If the particular layer is at the lowest level in the timeline, something wired is happening and all the 3D layers in the forground are loosing their "hierachical attribut" and are now overlapping each others.
If I put the particular layer at the top, the smoke is overlapping all the 3D layers and doesn't have any depth of field.
The "obscure layer" can't help since I have several layers in the forground.
And for some reasons I can't want precompose anything