3D models not showing textures or responding to lighting

Hey so I have this 3D game I am making with 3D models. However the models are loading in but are grey shapes, I have also tried to replace my comets with spheres but they also do not respond to lighting.

Here is the repostitory for my code http://gitlab.doc.gold.ac.uk/fwolf001/Flik_final_project/tree/master

Which format are u using? I had different results with variying formats. FBX works to seems best out of the box.
Make sure your texture files could be loaded, check the output in the logs.