Physically Based Material Showcase using Simplified PBR Shader (C++ OpenGL PBR Spheres)

I already have a basic C++/OpenGL template that compiles on macOS. I now need it extended so that, when I launch the executable, four spheres sit side-by-side in the scene, each rendered with a true PBR workflow… (Budget: ?600 – ?1500 INR, Jobs: 3D D…