I have been attempting to cast a shadow onto a floor using a light through a plane which has a wire mesh material on it, the mesh is done with a opacity mask. I have set the material up to work with world aligned UVs to make it easier as its used a lot across my level.
The problem is, when previewing the lightmass the shadows appear fine, but when lighting is built they disappear as if there is no mesh at all. So I tried removing the world align node and just using the texture as the opacity map, and it worked fine. So I am thinking Lightmap shadow baking does not work with World Aligned Textures?
Pictures below might explain better, both are taken after building lighting
This image is using a setup without world aligned textures, just a simple alpha map hooked up to opacity mask
This is the exact same setup, except with the textures set to world aligned