I have pbr material,as the object is made of by bmesh utilities which do not have UV, I link from Generated to Vector in Texture Coordinate in Mapping Node.After exporting into gltf, the texture of pbr material disappeared. Can not figure it out!
Does the material have the gltf-compatible option enabled? Such materials are very limited regarding to what can be made via nodes. If that’s the case then the material can only use a UV map from the Object Data Properties -> UV Maps panel.