Lightmap settings not being saved on reimport

When static meshes are reimported, the “generate lightmap uv” setting in the static mesh details is not saved. This means you have to go in to the static mesh details and uncheck the setting and set the lightmap coordinate index manually.

HI swraven -

To clarify, you are reimporting a Static Mesh one time with no Lightmap unwrap and using the Generate Lightmap function then reimporting the same Mesh with a Lightmap unwrap (UV1) and it is overriding your UV1 with a different unwrap?

Thank You

Eric Ketchum

Yes. The usual pipeline is rough out the model in Maya, import into UE, check what it looks like, then add second UV channel in Maya. UE requires that the “generate light map uv” setting be toggeled to off and the lightmap coordinate index be reset to 1 each time the model is exported as FBX and imported in UE. UE doesn’t remember the last setting, only the initial setting.

Hi Swraven -

Thank you for the additional information it helped me understand exactly what your problem is. Unfortunately, while your workflow functions by initially setting the Generate Lightmap UVs and then needing to turn it off, others want the workflow that allows for reimporting with always having the Engine generate Lightmaps. I can enter a feature request for this workflow but it would come down to essentially the same workaround, you would need to check a checkbox and apply the new settings which is what is currently in place.

Thank You

Eric Ketchum