**Refactor meshes format to support custom vertex layouts and new flexible api to access mesh data**

#3044 #2667

Source/Editor/SceneGraph/Actors/StaticModelNode.cs

@@ -23,7 +23,7 @@ namespace FlaxEditor.SceneGraph.Actors
     [HideInEditor]
     public sealed class StaticModelNode : ActorNode
     {
-        private Dictionary<IntPtr, Mesh.Vertex[]> _vertices;
+        private Dictionary<IntPtr, Float3[]> _vertices;
 
         /// <inheritdoc />
         public StaticModelNode(Actor actor)
@@ -53,14 +53,17 @@ namespace FlaxEditor.SceneGraph.Actors
                         var key = FlaxEngine.Object.GetUnmanagedPtr(mesh);
                         if (!_vertices.TryGetValue(key, out var verts))
                         {
-                            verts = mesh.DownloadVertexBuffer();
+                            var accessor = new MeshAccessor();
+                            if (accessor.LoadMesh(mesh))
+                                continue;
+                            verts = accessor.Positions;
                             if (verts == null)
                                 continue;
                             _vertices.Add(key, verts);
                         }
                         for (int i = 0; i < verts.Length; i++)
                         {
-                            var v = verts[i].Position;
+                            ref var v = ref verts[i];
                             var distance = Float3.DistanceSquared(ref pointLocal, ref v);
                             if (distance <= minDistance)
                             {