关于unity:三Unity-生成几种常用模型meshBoxShape

生成方块盒子的mesh，由底面的四个顶点和顶面的四个顶点组成，底面的Mesh是朝下的，所以底面的四个顶点以逆时针的形式排列，顶面的四个顶点还是以顺时针顺序排列。

1、取得顶点的数据汇合

  protected override Vector3[] GetVertices()        {            var p0 = new Vector3(-_xSize * 0.5f, -_ySize * 0.5f, -_zSize * 0.5f) - _verticeOffset;//左下            var p1 = new Vector3(_xSize * 0.5f, -_ySize * 0.5f, -_zSize * 0.5f) - _verticeOffset;//右下            var p2 = new Vector3(_xSize * 0.5f, -_ySize * 0.5f, _zSize * 0.5f) - _verticeOffset;//右上            var p3 = new Vector3(-_xSize * 0.5f, -_ySize * 0.5f, _zSize * 0.5f) - _verticeOffset;//左上            var p4 = new Vector3(-_xSize * 0.5f, _ySize * 0.5f, -_zSize * 0.5f) - _verticeOffset;//左下            var p5 = new Vector3(-_xSize * 0.5f, _ySize * 0.5f, _zSize * 0.5f) - _verticeOffset;//左上            var p6 = new Vector3(_xSize * 0.5f, _ySize * 0.5f, _zSize * 0.5f) - _verticeOffset;//右上            var p7 = new Vector3(_xSize * 0.5f, _ySize * 0.5f, -_zSize * 0.5f) - _verticeOffset;//右下            return new Vector3[]             {                //下                p1,p2,p3,p0,                //上                p4,p5,p6,p7,                //左                p3,p5,p4,p0,                //右                p1,p7,p6,p2,                //前                p2,p6,p5,p3,                //后                p0,p4,p7,p1             };        }

2、取得三角面顶点的索引

protected override int[] GetTriangles()        {            return new int[]            {                //下                0, 1, 2,                2, 3, 0,                //上                0 + 4 * 1, 1 + 4 * 1, 2 + 4 * 1,                2 + 4 * 1, 3 + 4 * 1, 0 + 4 * 1,                //左                0 + 4 * 2, 1 + 4 * 2, 2 + 4 * 2,                2 + 4 * 2, 3 + 4 * 2, 0 + 4 * 2,                //右                0 + 4 * 3, 1 + 4 * 3, 2 + 4 * 3,                2 + 4 * 3, 3 + 4 * 3, 0 + 4 * 3,                //前                0 + 4 * 4, 1 + 4 * 4, 2 + 4 * 4,                2 + 4 * 4, 3 + 4 * 4, 0 + 4 * 4,                //后                0 + 4 * 5, 1 + 4 * 5, 2 + 4 * 5,                2 + 4 * 5, 3 + 4 * 5, 0 + 4 * 5,            };        }

BoxShape整体代码如下

public class BoxShape : Shape    {        private static readonly string _boxMeshName = "Box Mesh";//mesh的名称        #region private members        private float _xSize, _ySize, _zSize;        #endregion        #region ctor        public BoxShape(float xSize, float ySize, float zSize, MeshPivot meshPivot) : base(meshPivot, _boxMeshName)        {            _xSize = xSize;            _ySize = ySize;            _zSize = zSize;            _verticeOffset = GetVertexOffset();        }        #endregion        #region override functions        /// <summary>        /// 依据mesh中心点的地位，取得顶点地位的偏移量        /// </summary>        /// <returns></returns>        protected override Vector3 GetVertexOffset()        {            Vector3 offset;            switch (_meshPivot)            {                case MeshPivot.CENTER:                    offset = Vector3.zero;                    break;                case MeshPivot.TOP:                    offset = new Vector3(0, _ySize, 0) * 0.5f;                    break;                case MeshPivot.BOTTOM:                    offset = new Vector3(0, -_ySize, 0) * 0.5f;                    break;                case MeshPivot.LEFT:                    offset = new Vector3(-_xSize, 0, 0) * 0.5f;                    break;                case MeshPivot.RIGHT:                    offset = new Vector3(_xSize, 0, 0) * 0.5f;                    break;                case MeshPivot.FRONT:                    offset = new Vector3(0, 0, _zSize) * 0.5f;                    break;                case MeshPivot.BACK:                    offset = new Vector3(0, 0, -_zSize) * 0.5f;                    break;                default:                    offset = Vector3.zero;                    break;            }            return offset;        }        /// <summary>        /// 取得顶点的数据汇合        /// </summary>        /// <returns></returns>        protected override Vector3[] GetVertices()        {            var p0 = new Vector3(-_xSize * 0.5f, -_ySize * 0.5f, -_zSize * 0.5f) - _verticeOffset;//左下            var p1 = new Vector3(_xSize * 0.5f, -_ySize * 0.5f, -_zSize * 0.5f) - _verticeOffset;//右下            var p2 = new Vector3(_xSize * 0.5f, -_ySize * 0.5f, _zSize * 0.5f) - _verticeOffset;//右上            var p3 = new Vector3(-_xSize * 0.5f, -_ySize * 0.5f, _zSize * 0.5f) - _verticeOffset;//左上            var p4 = new Vector3(-_xSize * 0.5f, _ySize * 0.5f, -_zSize * 0.5f) - _verticeOffset;//左下            var p5 = new Vector3(-_xSize * 0.5f, _ySize * 0.5f, _zSize * 0.5f) - _verticeOffset;//左上            var p6 = new Vector3(_xSize * 0.5f, _ySize * 0.5f, _zSize * 0.5f) - _verticeOffset;//右上            var p7 = new Vector3(_xSize * 0.5f, _ySize * 0.5f, -_zSize * 0.5f) - _verticeOffset;//右下            return new Vector3[]             {                //下                p1,p2,p3,p0,                //上                p4,p5,p6,p7,                //左                p3,p5,p4,p0,                //右                p1,p7,p6,p2,                //前                p2,p6,p5,p3,                //后                p0,p4,p7,p1             };        }        /// <summary>        /// 取得法线方向的数据汇合        /// </summary>        /// <returns></returns>        protected override Vector3[] GetNormals()        {           return new Vector3[]           {                //下                Vector3.down,Vector3.down,Vector3.down,Vector3.down,                //上                Vector3.up, Vector3.up, Vector3.up, Vector3.up,                //左                Vector3.left,Vector3.left,Vector3.left,Vector3.left,                //右                Vector3.right,Vector3.right,Vector3.right,Vector3.right,                //前                Vector3.forward, Vector3.forward, Vector3.forward, Vector3.forward,                //后                Vector3.back,Vector3.back,Vector3.back,Vector3.back,           };        }        /// <summary>        /// 取得三角面顶点的索引        /// </summary>        /// <returns></returns>        protected override int[] GetTriangles()        {            return new int[]            {                //下                0, 1, 2,                2, 3, 0,                //上                0 + 4 * 1, 1 + 4 * 1, 2 + 4 * 1,                2 + 4 * 1, 3 + 4 * 1, 0 + 4 * 1,                //左                0 + 4 * 2, 1 + 4 * 2, 2 + 4 * 2,                2 + 4 * 2, 3 + 4 * 2, 0 + 4 * 2,                //右                0 + 4 * 3, 1 + 4 * 3, 2 + 4 * 3,                2 + 4 * 3, 3 + 4 * 3, 0 + 4 * 3,                //前                0 + 4 * 4, 1 + 4 * 4, 2 + 4 * 4,                2 + 4 * 4, 3 + 4 * 4, 0 + 4 * 4,                //后                0 + 4 * 5, 1 + 4 * 5, 2 + 4 * 5,                2 + 4 * 5, 3 + 4 * 5, 0 + 4 * 5,            };        }        /// <summary>        ///  取得UV坐标的数据汇合        /// </summary>        /// <returns></returns>        protected override Vector2[] GetUVs()        {            return new Vector2[]             {                new Vector2(0,0),new Vector2(0,1),new Vector2(1,1),new Vector2(1,0),                new Vector2(0,0),new Vector2(0,1),new Vector2(1,1),new Vector2(1,0),                new Vector2(0,0),new Vector2(0,1),new Vector2(1,1),new Vector2(1,0),                new Vector2(0,0),new Vector2(0,1),new Vector2(1,1),new Vector2(1,0),                new Vector2(0,0),new Vector2(0,1),new Vector2(1,1),new Vector2(1,0),                new Vector2(0,0),new Vector2(0,1),new Vector2(1,1),new Vector2(1,0),             };        }        #endregion    }