glTF file format

Materials will be lost with glTF format. Why?

The glTF file requires external processing file formats, such as for textures, shaders and animation data. These external elements are stored in the glTF file, but each in a unique format.
Normally, one folder for a glTF asset looks like this.

On the other hand, R.Design can import the 3D object file only, so all the associated textures will be removed once it is imported.

Export directly from 3D Software

Blender

You should select either of the following formats to associate all applied materials with the object.
• glTF Binary (.glb)
• glTF Embedded (.gltf)

A sample glTF file: Farmhouse05_V2.gltf

Plugins to 3D software

3D Software

Rhinoceros

You need to install the plugin to import glTF files.                                              
Use
Rhino - Package Manager (rhino3d.com) and search for "glTF".
See
gITF for Rhino - Rhino / Rhino for Windows - McNeel Forum for your reference.

Sketchup

Convert from FBX file

Note: as far as we try, material will be lost once a FBX is converted online.