Inverting the clipping mask in Spine is not currently supported due to the complexities involved. The software's design focuses on traditional clipping masks, where you define an area to clip within, rather than inverting the area to clip outside of. This limitation is due to the technical challenges and the impact on runtime performance. However, some users have explored alternative approaches, such as covering a larger area with the clipping mask and creating a "hole" in it or using meshes to simulate the desired effect. Additionally, while Spine's runtimes are designed to be flexible, and some may theoretically support custom implementations of inverted clipping, the official stance is that Spine does not support inverted clipping masks due to the aforementioned complexities.
