KHR_materials_clearcoat
KHR_materials_sheen
KHR_materials_transmission
IOR
Specular
Volume
EXT_mesh_gpu_instancing
Are all of these properties supported in exporters for maya
Hi @kevinwang welcome to the forum
This list here : Babylon.js docs lists features supported by gltf export but I don’t know if it needs special conversion for the exporters.
cc @srzerbetto
I use maya exporters ,but i found [KHR_materials_sheen] not suported
cc @alexchuber
Hi and welcome!
Are you trying to import a glTF to Babylon and export it out to Maya? If so, we’ve discontinued development on our Maya exporter, and judging from this list, it looks like we don’t have Maya export support for the PBR properties you mentioned.
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I export a gltf from maya 2023
Ah, I see. Then this doc page will have the more correct list of features.
While we don’t actively maintain these exporters anymore, I’d be happy to review a PR that implements these extensions for the Maya exporter plugin. You may even be able to reference the logic from our own core glTF exporter 
e.g., Babylon.js/packages/dev/serializers/src/glTF/2.0/Extensions/KHR_materials_clearcoat.ts at master · BabylonJS/Babylon.js · GitHub
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