I’m building a huge tank from japan, made to contain floods. I made a very low res catwalk and instanced a light tube over it. I added a few decals on the wall. Now, when I bake the lightmaps, I get strange shadows on a few spots, on both the right side of the room and the left side, as there is a catwalk on both. In the beginning, I thought It came from the decals, as the size of the decal bounding box could have occluded the light on those problematic areas. But after removing the decals and re-baked the lights several times, the problem is still here.
Of course the light tubes don’t cast shadows and the lights I’m using (other that the emissive geometry of the tube light) are 2 rectangular lights, pointing in opposite directions.