75f160ee96
This adds a new "Active Camera" input geometry node, per #105761. The node outputs the the scene's current active camera. It is available from Input > Scene > Active Camera in the geometry nodes Add menu. Typical usage would be to connect this node to an Object Info node to obtain its transform. This works as expected when the camera's transform is animated, and also when there are markers on the timeline that change the active camera. In order to support the aforementioned changes in the active camera, this implementation adds depsgraph relations for all cameras referenced by timeline markers. This eliminates the complexity of updating the depsgraph whenever the scene switches to a different active camera, but of course it comes at the cost of including more objects than strictly necessary in the depsgraph for scenes that switch cameras. Dynamically updating the depsgraph upon camera changes could be a future improvement if there proves to be sufficient need for it. Pull Request: https://projects.blender.org/blender/blender/pulls/113431
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