Camera function

[misaki-eymard]

While it is possible to simulate the camera's field of view using clipping attachments or the Crop option in the export settings, but if you want to make a zoom animation, it may not work if there are bones in the skeleton with scale inheritance turned off. Also, if you want to imitate camera movements like panning and zooming with multiple skeletons, you have to set up the animation for each skeleton, which is a lot of work to manage in Spine. This problem can be solved by exporting the animations and editing them with external software, but it would be convenient if there was a camera function in Spine that could capture multiple skeletons together within a certain field of view.
This feature could be implemented as part of the Preview View feature, so it may be related to issue #371.

Related forum thread:
https://esotericsoftware.com/forum/d/26932-keyable-dynamic-image-output