Gray model, no shadow and no light

My trimesh don't show any darkest or lightest part, everything is gray, but i have lots of renderstates. Question, my mesh need normals to lightstate work (because i don't have)? My model has a solidcolor too, but the color isn't gray.

My code have worked well in my previous project, but not now.

Lighting does need normals info in order to function properly.