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Projector "unwraps" a sequence of images into a dome based on their match moved camera. This works best with nodal cameras.
It creates a series of cards for each frame specified in "range" which are all projected through the match moved camera. In the example below I have a nodal camera that slowely pans left to right over 250 frames.
The texture for each card is the respective frame so it pretty much reconstructs a shot by using only a few frames. This is great for creating faux clean plates for keying or paint outs. You can also use the static output mode to render a still frame of the unwrapped shot as a base layer for a matte painting which can then be reprojected.
Because Projector recursively creates internal nodes this node has to stay as a group and can not be exported as a gizmo. Check out the tool tip help for more info.