This is maybe not very relevant to the defold-pbr itself, but it is to the test project.

When calling PBR.set_camera_world(go.get_world_position("/camera")) in the update function, the PBR extension will get the camera position one frame after each render leading to lighting calculations being a bit off when moving the camera.

I had to do two things to fix this: 1) Call PBR.set_camera_world after the camera gets its new position. 2) Use go.get_position instead of go.get_world_position as go.get_world_position is lagging behind one frame. Posting a message and setting the position using go.get_position in on_message worked for me. Maybe there's a better way.