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- Removed hardcoded element type arrays (Vertices, Edges, Triangles etc.). Mesh element types can now be arbitrarily added, with any number of channels. - Mesh element containers have a much leaner format; instead of sparse arrays, they are now represented by a simple bitarray, determining whether an index is used or not. Consequently, mesh topology is now entirely described with the attribute system, e.g. edge start and end vertices, triangle vertices, etc. - Support added for attributes of arbitrary dimensions, e.g. float[4] or int[2]. - Support added for attributes which index into another mesh element container. - Added FMeshElementIndexer: this is an efficient container for maintaining backward references from one element type to another; for example, edges have an attribute specifying which vertices are at each end (an attribute of type FVertexID[2]). With an indexer, it is possible to look up which edges contain a given vertex, even though this is not explicitly stored. Indexers are designed to do minimal allocations and update lazily and in batch when necessary. - Added support for preserving UV topology in static meshes. UVs are now a first-class element type which may be indexed directly from triangles. - Added the facility to access the underlying array in an attribute array directly. - Triangles now directly reference their vertex, edge and UV IDs. Vertex instances are to be deprecated. - Changed various systems to be triangle-centric rather than polygon-centric, as this is faster. Triangles are presumed to be the elementary face type in a MeshDescription, even if polygons are still supported. The concept of polygons will be somewhat shifted to mean a group of triangles which should be treated collectively for editing purposes. - Optimised normal/tangent generation and FBX import. - Deprecated EditableMesh, MeshEditor and StaticMeshEditorExtension plugins - these are to be removed, but they still have certain hooks in place which need removing. #rb [CL 13568702 by Richard TalbotWatkin in ue5-main branch]