I got some issues with the Lightmapping.
I wanna Bake on only one Assets. I select it and push Bake Selected. And Unity Rebuild the lightmap of the scene.
Did someone get the same problem ?
I see nothing on it with a research.
I trie to hide all the mesh in the scene.
Unity Rebuilt again all the lightmaps : the hidden object loses their lightmap and he create only one lightmap for the visible object.