Hi, I guess the material generated from the gltf file didn't keep the unshaded information, I'll check if there is a way to keep this. Also I'm wondering, what did you use to make your model unshaded in blender ?
Btw I'm currently working on materials for the next update to be able to edit the parameters (color, shading, etc) and also add predefined shaders (like palette indexation but per material). So after this update, setting the materials to unshaded will be possible.
Be able to write some custom shaders could be really useful indeed, I'll note that for a future update.
Yes I saw it on Twitter, thank you very much !