netDxf/Entities/Face3d.cs

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#region netDxf, Copyright(C) 2014 Daniel Carvajal, Licensed under LGPL.

//                        netDxf library
// Copyright (C) 2014 Daniel Carvajal (haplokuon@gmail.com)
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

#endregion

using System.Collections.Generic;
using netDxf.Tables;

namespace netDxf.Entities
{
    /// <summary>
    /// Represents a 3dFace <see cref="EntityObject">entity</see>.
    /// </summary>
    public class Face3d :
        EntityObject
    {
        #region private fields

        private Vector3 firstVertex;
        private Vector3 secondVertex;
        private Vector3 thirdVertex;
        private Vector3 fourthVertex;
        private Face3dEdgeFlags edgeFlags;

        #endregion

        #region constructors

        /// <summary>
        /// Initializes a new instance of the <c>Face3d</c> class.
        /// </summary>
        public Face3d()
            : this(Vector3.Zero, Vector3.Zero, Vector3.Zero, Vector3.Zero)
        {
        }

        /// <summary>
        /// Initializes a new instance of the <c>Face3d</c> class.
        /// </summary>
        /// <param name="firstVertex">3d face <see cref="Vector2">first vertex</see>.</param>
        /// <param name="secondVertex">3d face <see cref="Vector2">second vertex</see>.</param>
        /// <param name="thirdVertex">3d face <see cref="Vector2">third vertex</see>.</param>
        public Face3d(Vector2 firstVertex, Vector2 secondVertex, Vector2 thirdVertex)