I have a Window projected texture and a fixed camera. The texture was made in another program based on a render of the scene. As long as I am looking through the camera, the texture is lined up properly. But if I switch to the viewport camera, then the texture is projected from the viewport, and so looks wrong.
Is there a way to do something like Window projection, but have it always be projected from the Active Camera (or object I can place in the same location), and not the viewport? Preferably a node based solution. I understand that the UV project modifier might work for this, but then I have to maintain that on every object in the project rather than just adding some nodes to a group.