Mesh shaders are interesting but it seems like most of the trick to making them useful is in the mesh preparation itself. The tricky part is you need your meshlet geometry to match at each level of detail, yet you also want to ensure cracks do not form in between meshlets. And ideally you would want the meshlets to be stored in a hierarchical structure for optimal rendering.
Does any general tool exist yet for this purpose? Is there a common 3D file format for this type of geometry?