@nupuryu Please note that SkeletonRenderTexture is just an example component to show how you can properly fade out a skeleton by rendering it to a RenderTexture at full opacity first and then displaying the RenderTexture with lowered opacity. SkeletonRenderTexture does not aim to cover every possible use-case.
Regarding rendering a skeleton to a RenderTexture which was first separated: I'm not sure I understand your scenario. If you first separate it, why do you want to render it to a single RenderTexture then, this turns it into a single GameObject again, you can't interleave anything between parts then. Or do you want to render the skeleton parts to multiple RenderTextures, each separator-part to its own RenderTexture?
If you want to combine multiple GameObjects of multiple skeletons and other objects to a RenderTexture, it would likely be easiest to manually create a Camera for it and set the output to a RenderTexture. Then set up the target objects to be rendered only to this camera.
