public override Point3 VisitVertex(StlAsciiParser.VertexContext context)
            {
                IEnumerable <float> parsed     = context.FLOAT().Select((x) => float.Parse(x.GetText()));
                IEnumerator <float> enumerator = parsed.GetEnumerator();

                enumerator.MoveNext();
                float x = enumerator.Current;

                enumerator.MoveNext();
                float y = enumerator.Current;

                enumerator.MoveNext();
                float z = enumerator.Current;

                return(new Point3(x, y, z));
            }
 /// <summary>
 /// Visit a parse tree produced by <see cref="StlAsciiParser.vertex"/>.
 /// <para>
 /// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
 /// on <paramref name="context"/>.
 /// </para>
 /// </summary>
 /// <param name="context">The parse tree.</param>
 /// <return>The visitor result.</return>
 public virtual Result VisitVertex([NotNull] StlAsciiParser.VertexContext context)
 {
     return(VisitChildren(context));
 }