Hey :wave: Is there a reason the aoMap uses the second UV channel? In other PBR applications, like in Unreal Engine, the AO Map uses UV channel 1, like normal maps, albedo maps etc. I understand why lightMap uses the second UV channel, as this is usually used to show how the mesh is lit within an…

This is explained in this thread: [image] Why do AO and LightMap need a second set of UVs? Questions To summarize this a bit and explain why it applies to AO/lightmaps specifically — three.js does not (yet) provide a proper API for changing which UV set is used by a par…

Why does the AOMap use the second UV channel?

Questions

Mugen87 April 22, 2021, 11:14am 2

This is explained in this thread:

Topic		Replies	Views
Why do AO and LightMap need a second set of UVs? Questions uv-mapping , lightmap	9	6081	October 13, 2020
How to use AOMap Questions textures , materials	7	6483	October 18, 2023
Documentation: What exactly is texture.channel for? Site Feedback documentation , texture , uv , texture-channel	4	203	April 14, 2025
Help with aoMap of GLTF/GLB model Questions gltf-loader	11	4543	June 24, 2020
Change Mesh map except of AO map which has two uv map Questions textures , materials , uv-mapping , ambient-occlusion	2	720	May 17, 2023

Why does the AOMap use the second UV channel?

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