I am converting a stand made of geometry brushes to static mesh (no materials applied). After I build I get this error , and the lighting/shadows on the mesh are screwed up.
It means that the specified light map coordinate has overlapping UVs. You can try fixing it by opening your static mesh in the viewer and using the auto UV tool. It should create the new UVs in channel 1 by default but you will have to change the lightmapcoordinateindex setting to match.
When you open the mesh viewer you’ll need to go up to “Window” in the menu bar and select “Generate Unique UVs”
This will open up a new window under the details panel to the right.
Hit apply, as the defaults should get you started.
In the details panel you’ll need to find where it says “Lightmap Coordinate Index” and change that from 0 to 1
Thank Tim for the detailed how to. It did help with getting rid of the errors but the lighting/shadows are still not how they should be. I have created a topic on the forums regarding this issue with more details.
These options do not look exactly the same in 4.10. Much of it is streamlined but you still need to update the Light Map Coordinate Index to 1.
Thanks for the tip Tim
When I had this problem I realized that you need to have a texture as your material. It won’t work with just a color set as a material. Unreal engine 4 don’t know where to start generating the light map, but if you have set a texture UE can use that coordinate to generate the lightmap. UE can’t generate a lightmap on it’s own.
When I had this problem I realized that you need to have a texture as your material. It won’t work with just a color set as a material. Unreal engine 4 don’t know where to start generating the light map, but if you have set a texture UE can use that coordinate to generate the lightmap. UE can’t generate a lightmap on it’s own.
I randomly have this issues on models i make in the engine, but today finally i was able to resolve that issue.
In addition to above to get in the right light channel -
Goto Modeling Mode and click AutoUV “default settings worked in my case”.
Then goto UV “Layout” and tweek your scales if needed.
I fixed 9 in engine models this way after they where in the write channel " 1 ", not 0.