AcTools.Kn5File.Kn5.IsMultiMaterial C# (CSharp) Method

        private static bool IsMultiMaterial(Kn5Node node) {
            return node.NodeClass == Kn5NodeClass.Base &&
                    node.Children.Any() &&
                    node.Children.All(x => x.NodeClass == Kn5NodeClass.Mesh) &&
                    Enumerable.Range(0, node.Children.Count).All(x => node.Children.Any(y => y.Name == node.Name + "_SUB" + x));
        }