CSharpGL.IPickableHelper.GetLastVertexIdOfPickedGeometry C# (CSharp) Method

        public static bool GetLastVertexIdOfPickedGeometry(this IPickable element,
            uint stageVertexId, out uint lastVertexId)
        {
            lastVertexId = uint.MaxValue;
            bool result = false;

            if (element != null)
            {
                if (stageVertexId < element.PickingBaseId) // ID is in some previous element.
                { return false; }

                uint vertexCount = element.GetVertexCount();
                uint id = stageVertexId - element.PickingBaseId;
                if (id < vertexCount)
                {
                    lastVertexId = id;
                    result = true;
                }
                else // ID is in some subsequent element.
                {
                    result = false;
                }
            }

            return result;
        }