Generate thumbnails on imported scenes. #96544
Draft
+184
−1
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Ends a somewhat long-standing discontinuity of the imported scenes (FBX, GLTF, Collada, ect.) not having any thumbnail previews like regular Godot scenes. It does this by providing a hook step where they can be generated and cached upon reimport.
Keeping this in draft for now since it could probably benefit from further refactoring, improving bounds calculations for skinned meshes, and adding displayable gizmos for the cases where no mesh instances could be found (animation or collision-only imports, for example).