Option to create secondary UV set for lightmaps at design-time import

[Tripl3Design]

I have a problem that the imported gltf's are not joining the bake process.
They are set 'static' but they are not changing.

I exported the models to gltf in another scene without materials.
I imported them and add the materials manually.

[atteneder]

Hi @Tripl3Design ,

As far as I know models require a second UV set for lightmap baking to work. Here's a small test scene with a glTF(glb) cube. The left one has just one UV set while the right one has two:

As you can see, the right one has proper lightmaps applied to it.

Other importers (like the FBX importer) have an option to automatically create those for you, but unfortunately glTFast does not. I'll ask around if FBX's UV unwrapper could be re-used.

Regards

[Tripl3Design]

Hi @atteneder,

Thanks for this fast reply!
This tool is awesome, can't wait for the runtime exporter.

I use this workaround:
Export the gltf to fbx, and use the fbx instead with 'Generate Lighmap UV's' checked.

[atteneder]

Thanks!

For the record:
There is an API for generating the secondary UVs, which could be integrated into the GltfImporter quite easily:

https://docs.unity3d.com/ScriptReference/Unwrapping.GenerateSecondaryUVSet.html

Keeping this issue open as a feature request.