Hi, I’ve used Babylonjs for several projects, I’m also an Unreal Engine 4 developer and have big interest in the ability to export glTF directly from Unreal Engine and use directly in BabylonJS.
There is an open source project that supports this for PlayCanvas (GitHub - ue4plugins/GLTFWebViewer) which has a few extensions that allow enhanced rendering, including extension for lightmaps.
I’m no expert in BabylonJS to understand how to implement these extensions myself. Anyone can shed some light on how to tackle this task? I’m mostly interested in the lightmap extension.
Welcome aboard!
There’s a lightmap extension which is currently opened for glTF but it seems it is frozen for 2 years now.
I think @MackeyK24 could give some feedback about implementing custom lightmaps support in glTF as he did it for the Unity exporter (or I think he did it?).
Yep I make RGBD packed HDR lightmaps in Unity…
I actually offset the mesh uv2 with the lightmap texture atlas info
Then it’s just a matter of assigning the material.lightmapTexure
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Hi Mackey, can you shine some light on how to develope the glTF extension. As I don’t quite understand how it’s run within BabylonJS to apply lightmaps.
@bghgary is da man 
That is where i also started when i made my GLTF Extension for the Babylon Toolkit
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This did help along with some other resources. I finally managed to make my own extensions. Much appreciated!
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Yo @Khoa_Pham … Did you ever get the EPIC_ gtlf extensions working in BabylonJS ?