Already achieve to export to obj file; however, the material file serialization function OBJExport.MTL(scene.meshes) throw following error when used:
Uncaught TypeError: Cannot read properties of undefined (reading ‘specularPower’)
at Function.e.MTL (babylon.serializers.min.js:1)
What am I doing wrong???
This is really hard to tell without a repro. Could you share one in the playground ?
Total shot in the dark but going off of the documentation can you even do scene.meshes as an argument?
or does it only take 1 mesh at a time?
Take any scene and try to export all meshes at same time (scene.meshes) and it will throw the error, or the array must be refined?
Oh. Excuse me. Now I understand. Documentation shows that the Mat function do not let more than a mesh at te same time. My mistake. So sorry to be a PIA
You are completely fine. I hope that was the correct fix? 
Well no really. Documentation shows that massive material export cannot be done, at least with that function. So, have no solution to export more than 1 mesh with different types of material
Can you not just iterate through your the meshes and then just export each separately?
The functions returns a string, so in theory you can take that string each iteration and build on it in whatever format you’d like. I would assume some sort of json.
Yes, that would do it. Thanks