Maybe it would possible to add a bookmark feature that acts as clean screenshots. Notes / draw overs could be saved per bookmark while still allowing for free orbiting of the model by the reviewer if they wish to do so?
I'm a 3D character artist by trade, and getting useful feedback on in-progress work has always been harder than it should be. You post a render and it's either "looks sweet" or silence. This forum is one of the few places I've ever gotten real crits, which is part of why I'm posting here. So I built a tool to fix it. The…