Wavefront .obj files have the concept of "smoothing groups," which basically just means "interpolate the normals of these faces so the group of faces looks like a smooth surface."
pbr reads the basic .obj format but doesn't currently respect smoothing groups, so models that rely on smoothing groups end up looking like this:
Wavefront .obj files have the concept of "smoothing groups," which basically just means "interpolate the normals of these faces so the group of faces looks like a smooth surface."
pbr reads the basic .obj format but doesn't currently respect smoothing groups, so models that rely on smoothing groups end up looking like this: