Hacked out MergeBuffers again, for STK 12.6 and below only.

Author: emackey

src/SharpGLTF.Toolkit/Geometry/Packed/PackedPrimitiveBuilder.cs

@@ -217,7 +217,7 @@ private static void _MergeSequentialVertices(IEnumerable<MACCESSOR[]> primitives
                 }
             }
 
-            foreach (var vb in vertexBuffers.Values) vb.MergeBuffers();
+            //foreach (var vb in vertexBuffers.Values) vb.MergeBuffers();
         }
 
         private static void _MergeStridedVertices(IEnumerable<PackedPrimitiveBuilder<TMaterial>> primitives)
@@ -235,7 +235,7 @@ private static void _MergeStridedVertices(IEnumerable<PackedPrimitiveBuilder<TMa
                     vertexBuffers.AddAccessors(p._VertexAccessors);
                 }
 
-                vertexBuffers.MergeBuffers();
+                //vertexBuffers.MergeBuffers();
             }
         }
 
@@ -248,7 +248,7 @@ private static void _MergeIndices(IEnumerable<PackedPrimitiveBuilder<TMaterial>>
                 indexBuffers.AddAccessors(p._IndexAccessors);
             }
 
-            indexBuffers.MergeBuffers();
+            //indexBuffers.MergeBuffers();
         }
 
         #endregion