How many lightmap can be used in a gltf model?

[Muhamad_Rifky]

hi all,

is it possible that the lightmap file in the gltf model can be more than one?

[Evgeni_Popov]

I think glTF only supports two uv sets officially. Let’s ping @bghgary who will know for sure.

Note that lightmaps are not supported by glTF. These threads can help:

• How many types of Lightmaps are there to use & how to link them in Maya so that those LightMaps should come Properly in .Babylon or .gltf? - #3 by PatrickRyan
• GLB Exports : Tileable Textures & Lightmaps/ Baked Lights - #3 by PatrickRyan

[bghgary]

@Evgeni_Popov

I think glTF only supports two uv sets officially.

glTF requires that implementations support at least 2 UV sets. We recently changed our implementation to support 6 (was 2 originally). If a glTF uses more than 2 UV sets, it will not be as portable.

[Muhamad_Rifky]

Thanks all,
Now I understand

[Vinc3r]

If this example can help: https://playground.babylonjs.com/#ADPQFC#9 (here lightmaps are not embeded in the .glb, but availabled next to it)