/// <summary>
/// 该方法可将geomodel中的mesh集合合并为一个mesh对象
/// </summary>
/// <param name="geoModel"></param>
/// <param name="Tolerance">容差，小数点后位数。设置后所有点坐标的小数点后只保留该长度</param>
public static void MergeMeshs(this GeoModel geoModel, int Tolerance=2)
{
if (geoModel.Meshes.Count > 0)
{
Mesh mesh = new Mesh();
Dictionary<int, Vertice> vPDic;
List<Index> vPIndex;
geoModel.structureData(Tolerance,out vPDic,out vPIndex);
//归一化法线
foreach (KeyValuePair<int, Vertice> vP in vPDic)
{
double distence = Math.Sqrt(Math.Pow(vP.Value.Normal.X, 2) + Math.Pow(vP.Value.Normal.Y, 2) + Math.Pow(vP.Value.Normal.Z, 2));
if (distence>0)
{
vP.Value.Normal.X /= distence;
vP.Value.Normal.Y /= distence;
vP.Value.Normal.Z /= distence;
}
}
geoModel.MakeMesh(vPDic, vPIndex);
geoModel.CalculateNormals(ref vPDic, vPIndex);
}
}
/// <summary>
/// 按平面切割模型
/// </summary>
/// <param name="geoModel"></param>
/// <param name="surface">切割平面</param>
public static void ClipModel(this GeoModel geoModel, Surface surface)
{
if (geoModel.Meshes == null) return;
#region 提取顶点
Dictionary<int, Vertice> vPDic;
List<Index> vPIndex;
geoModel.structureData(2, out vPDic, out vPIndex);
#endregion
List<Index> wellBeRm = new List<Index>();
List<Index> wellBeAdd = new List<Index>();
foreach (Index index in vPIndex)
{
#region 找到至少具有一点高于切割平面的三角面
if (!surface.isBelowMe(vPDic[index.P1]) || !surface.isBelowMe(vPDic[index.P2]) || !surface.isBelowMe(vPDic[index.P3]))
{
wellBeRm.Add(index);
//第一步去掉都三个顶点都在切割面上方的三角面
if (!surface.isBelowMe(vPDic[index.P1]) && !surface.isBelowMe(vPDic[index.P2]) && !surface.isBelowMe(vPDic[index.P3]))
{
//vPDic.Remove(index.P1); vPDic.Remove(index.P2); vPDic.Remove(index.P3);
//只需要删掉索引！不要删掉点，这个点还可能被其它三角面索引到，而其它三角面可能与切割平面相交
//这里不能直接在循环体内删除。应该记录列表，待循环完毕后再统一删，否则会打乱集合。
//vPIndex.Remove(index);
//这里逻辑应该是都会删掉的，移到判断外去执行了
//wellBeRm.Add(index);
}
else
{
//剩下的就是和切割平面相交的三角面。这里开始计算三角形边与平面的交点
#region 计算交点的函数
//P1在下
if (surface.isBelowMe(vPDic[index.P1]))
{
#region
//P1,P2在下，P3在上
if (surface.isBelowMe(vPDic[index.P2]))
{
#region
Vertice vP1 = surface.Intersect(vPDic[index.P1], vPDic[index.P3]);//第一个交点
Vertice vP2 = surface.Intersect(vPDic[index.P2], vPDic[index.P3]);//第二个交点
//插入新生成的两个点，并添加这两点和剩下两点构成三角面的索引。
if (!vPDic.ContainsKey(vP1.HashCode)) vPDic.Add(vP1.HashCode, vP1);
if (!vPDic.ContainsKey(vP2.HashCode)) vPDic.Add(vP2.HashCode, vP2);
//连接P1和vP2,构成两个三角形
Index vIn1 = new Index()
{
P1 = vP1.HashCode,
P2 = vP2.HashCode,
P3 = vPDic[index.P1].HashCode
};
Index vIn2 = new Index()
{
P1 = vPDic[index.P1].HashCode,
P2 = vP2.HashCode,
P3 = vPDic[index.P2].HashCode
};
//同理这里不能直接编辑当前循环的list
//vPIndex.Add(vIn1);
//vPIndex.Add(vIn2);
wellBeAdd.Add(vIn1);
wellBeAdd.Add(vIn2);
#endregion
}
//P1,P3在下，P2在上
else if (surface.isBelowMe(vPDic[index.P3]))
{
#region
Vertice vP1 = surface.Intersect(vPDic[index.P1], vPDic[index.P2]);//第一个交点
Vertice vP2 = surface.Intersect(vPDic[index.P3], vPDic[index.P2]);//第二个交点
//插入新生成的两个点，并添加这两点和剩下两点构成三角面的索引。
if (!vPDic.ContainsKey(vP1.HashCode)) vPDic.Add(vP1.HashCode, vP1);
if (!vPDic.ContainsKey(vP2.HashCode)) vPDic.Add(vP2.HashCode, vP2);
//连接P1和vP2,构成两个三角形
Index vIn1 = new Index()
{
P1 = vP1.HashCode,
P2 = vP2.HashCode,
P3 = vPDic[index.P1].HashCode
};
Index vIn2 = new Index()
{
P1 = vPDic[index.P1].HashCode,
P2 = vP2.HashCode,
P3 = vPDic[index.P3].HashCode
};
//vPIndex.Add(vIn1);
//vPIndex.Add(vIn2);
wellBeAdd.Add(vIn1);
wellBeAdd.Add(vIn2);
#endregion
}
//P1在下，P2,P3在上
else
{
#region
Vertice vP1 = surface.Intersect(vPDic[index.P1], vPDic[index.P2]);//第一个交点
Vertice vP2 = surface.Intersect(vPDic[index.P1], vPDic[index.P3]);//第二个交点
//插入新生成的两个点，并添加这两点和剩下一点构成三角面的索引
if (!vPDic.ContainsKey(vP1.HashCode)) vPDic.Add(vP1.HashCode, vP1);
if (!vPDic.ContainsKey(vP2.HashCode)) vPDic.Add(vP2.HashCode, vP2);
Index vIn = new Index()
{
P1 = vP1.HashCode,
P2 = vP2.HashCode,
P3 = vPDic[index.P1].HashCode
};
//vPIndex.Add(vIn);
wellBeAdd.Add(vIn);
#endregion
}
#endregion
}
else
//P1在上
{
#region
//P1,P2在上，P3在下
if (!surface.isBelowMe(vPDic[index.P2]))
{
#region
Vertice vP1 = surface.Intersect(vPDic[index.P3], vPDic[index.P2]);//第一个交点
Vertice vP2 = surface.Intersect(vPDic[index.P3], vPDic[index.P1]);//第二个交点
//插入新生成的两个点，并添加这两点和剩下一点构成三角面的索引
if (!vPDic.ContainsKey(vP1.HashCode)) vPDic.Add(vP1.HashCode, vP1);
if (!vPDic.ContainsKey(vP2.HashCode)) vPDic.Add(vP2.HashCode, vP2);
Index vIn = new Index()
{
P1 = vP1.HashCode,
P2 = vP2.HashCode,
P3 = vPDic[index.P3].HashCode
};
//vPIndex.Add(vIn);
wellBeAdd.Add(vIn);
#endregion
}
//P1,P3在上，P2在下
else if (!surface.isBelowMe(vPDic[index.P3]))
{
#region
Vertice vP1 = surface.Intersect(vPDic[index.P2], vPDic[index.P3]);//第一个交点
Vertice vP2 = surface.Intersect(vPDic[index.P2], vPDic[index.P1]);//第二个交点
//插入新生成的两个点，并添加这两点和剩下一点构成三角面的索引
if (!vPDic.ContainsKey(vP1.HashCode)) vPDic.Add(vP1.HashCode, vP1);
if (!vPDic.ContainsKey(vP2.HashCode)) vPDic.Add(vP2.HashCode, vP2);
Index vIn = new Index()
{
P1 = vP1.HashCode,
P2 = vP2.HashCode,
P3 = vPDic[index.P2].HashCode
};
//vPIndex.Add(vIn);
wellBeAdd.Add(vIn);
#endregion
}
//P1在上，P2,P3在下
else
{
#region
Vertice vP1 = surface.Intersect(vPDic[index.P2], vPDic[index.P1]);//第一个交点
Vertice vP2 = surface.Intersect(vPDic[index.P3], vPDic[index.P1]);//第二个交点
//插入新生成的两个点，并添加这两点和剩下两点构成三角面的索引。
if (!vPDic.ContainsKey(vP1.HashCode)) vPDic.Add(vP1.HashCode, vP1);
if (!vPDic.ContainsKey(vP2.HashCode)) vPDic.Add(vP2.HashCode, vP2);
//连接P1和vP2,构成两个三角形
Index vIn1 = new Index()
{
P1 = vP1.HashCode,
P2 = vP2.HashCode,
P3 = vPDic[index.P2].HashCode
};
Index vIn2 = new Index()
{
P1 = vPDic[index.P2].HashCode,
P2 = vP2.HashCode,
P3 = vPDic[index.P3].HashCode
};
//vPIndex.Add(vIn1);
//vPIndex.Add(vIn2);
wellBeAdd.Add(vIn1);
wellBeAdd.Add(vIn2);
#endregion
}
#endregion
}
//surface.Intersect()
#endregion
}
}
#endregion
}
//统一删除刚刚记录的三角面
foreach (Index index in wellBeRm) {
vPIndex.Remove(index);}
//统一添加
foreach (Index index in wellBeAdd)
{
Console.WriteLine("=添加点=");
Console.WriteLine(string.Format("{0},{1},{2}", vPDic[index.P1].X, vPDic[index.P1].Y, vPDic[index.P1].Z));
Console.WriteLine(string.Format("{0},{1},{2}", vPDic[index.P2].X, vPDic[index.P1].Y, vPDic[index.P2].Z));
Console.WriteLine(string.Format("{0},{1},{2}", vPDic[index.P3].X, vPDic[index.P1].Y, vPDic[index.P3].Z));
Console.WriteLine("========");
vPIndex.Add(index);
}
Point3Ds ps = new Point3Ds();
ps.ImportVPList(vPDic, wellBeAdd);
Mesh m = geoModel.CreateMesh(ps);
//geoModel.Meshes.Clear();
geoModel.Meshes.Add(m);
geoModel.MergeMeshs();
geoModel.MakeMesh(vPDic, vPIndex);
geoModel.CalculateNormals(ref vPDic, vPIndex);
}
/// <summary>
/// 根据结构化的数据制作mesh,三角网构造算法还没写好。此函数构造的面连线不正确
/// </summary>
/// <param name="geoModel"></param>
/// <param name="vPDic">顶点集合</param>
/// <param name="vPIndex">索引列表</param>
public static void MakeMesh(this GeoModel geoModel, Dictionary<int, Vertice> vPDic, List<Index> vPIndex)
{
#region 输出结构化数据到顺序数组
double[] Vertices = new double[vPIndex.Count * 3 * 3];//由于顶点被按照索引展开，这里需要额外的空间。
Int32[] Indexes = new Int32[vPIndex.Count * 3];
double[] Normals = new double[Vertices.Length];
int j = 0;
for (int i = 0; i < Indexes.Length; i++)
{
Indexes[i] = i;//顺序写入索引，之后的点序列按照这个索引展开
}
foreach (Index index in vPIndex)
{
//这里又产生了重复数据，我不知道要怎么再不产生重复的基础上写入数组
#region 依赖索引list写入顶点数组，此过程多次索引的顶点被展开了
Vertices[j] = vPDic[index.P1].X; Vertices[j + 1] = vPDic[index.P1].Y; Vertices[j + 2] = vPDic[index.P1].Z;
Vertices[j + 3] = vPDic[index.P2].X; Vertices[j + 4] = vPDic[index.P2].Y; Vertices[j + 5] = vPDic[index.P2].Z;
Vertices[j + 6] = vPDic[index.P3].X; Vertices[j + 7] = vPDic[index.P3].Y; Vertices[j + 8] = vPDic[index.P3].Z;
#endregion
#region 计算法向量
geoModel.CalculateNormals(ref vPDic, vPIndex);
#endregion
#region 写入法向量
Normals[j / 9] = vPDic[index.P1].Normal.X;
Normals[(j / 9) + 1] = vPDic[index.P1].Normal.Y;
Normals[(j / 9) + 2] = vPDic[index.P1].Normal.Z;
Normals[(j / 9) + 3] = vPDic[index.P2].Normal.X;
Normals[(j / 9) + 4] = vPDic[index.P2].Normal.Y;
Normals[(j / 9) + 5] = vPDic[index.P2].Normal.Z;
Normals[(j / 9) + 6] = vPDic[index.P3].Normal.X;
Normals[(j / 9) + 7] = vPDic[index.P3].Normal.Y;
Normals[(j / 9) + 8] = vPDic[index.P3].Normal.Z;
#endregion
j += 9;
}
#endregion
Mesh mesh = new Mesh();
mesh.Vertices = Vertices;
mesh.Indexes = Indexes;
mesh.Normals = Normals;
geoModel.Meshes.Clear();
geoModel.Meshes.Add(mesh);
}