Mikhail Luzyanin

It’s not supported. Just use Mapping node.

can you share the file?

Check that each vertex has max 5 bone weights, better less. If it hase more clean all 0 weight, it should help.

fac output not supported. You can mix up to 10 shaders. You can use as masks Red, Green, Blue, Yellow (R+G), Light Blue (G+B), Magenta (R+B), black and white colors.

If you want to use vertex animation in the engine you need to animate shapekeys or bake it to shapekeys. Look at this video.

All materials must be gltf2.0-compatible to export them to gltf from app. Look at this part of doc.

You could upload video on youtube aand leave the link here or to any file sharing service and leave the link here. Usually the library make life easier for people and you the first user who ran into this problem. May be it’s combination of software problems. What blender version do you use?

Unfortunally Verge3D ssr works only with roushness set to 1, so the only way to achieve rough refraction is to refract environment not the object. So there’s no way for not to do the same in Verge3D as in Blender.