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@ -1,5 +1,6 @@ |
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using System.IO; |
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using System.Text; |
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using HelixToolkit.SharpDX.Core; |
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using SharpDX; |
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using SparkClient.Views.UserControl.ViewportData.Entity; |
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using SparkClient.Views.UserControl.ViewportData.Enum; |
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@ -8,154 +9,171 @@ namespace SparkClient.Views.UserControl.ViewportData.Helper; |
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public class ObjExporter |
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{ |
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public static void ExportToObj2(List<Viewport3DTriangleEntity> entities, string outputPath) |
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{ |
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// 分组：按面代码 PlaneCode 分组 |
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var faceGroups = entities |
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.GroupBy(e => e.PlaneCode) |
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.ToDictionary(g => g.Key, g => g.ToList()); |
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// 存储每个面的顶点和法线 |
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var faceData = new Dictionary<string, FaceData>(); |
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// Step 1: 处理每个面，生成顶点列表并计算法线 |
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foreach (var group in faceGroups) |
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{ |
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//分组 |
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Dictionary<string, List<Viewport3DTriangleEntity>> feactList = entities |
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.Where(entity => entity.PlaneType != PlaneType.Girdle) |
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.GroupBy(entity => entity.PlaneCode) |
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.ToDictionary(group => group.Key, group => group.ToList()); |
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//腰 单组 |
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// List<Viewport3DTriangleEntity> waistList = entities |
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// .Where(entity => entity.PlaneType == PlaneType.Girdle) |
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// .ToList(); |
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Dictionary<string, List<Viewport3DTriangleEntity>> gridleList = entities |
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.Where(entity => entity.PlaneType == PlaneType.Girdle) |
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.GroupBy(entity => entity.PlaneCode) |
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.ToDictionary(group => group.Key, group => group.ToList()); |
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//同一个面只保留外边框(除了腰) |
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Dictionary<string, List<Vector3>> resultPoints = new Dictionary<string, List<Vector3>>(); |
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foreach (var dic in feactList) |
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{ |
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List<Vector3> tempPoints = new List<Vector3>(); |
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foreach (var entity in dic.Value) |
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{ |
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tempPoints.Add(entity.Point1); |
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tempPoints.Add(entity.Point2); |
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tempPoints.Add(entity.Point3); |
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} |
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resultPoints.Add(dic.Key, ViewportHelperPro.VectorClockwiseSort(new HashSet<Vector3>(tempPoints).ToList())); |
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} |
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// 合并所有顶点并去重 |
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var vertices = group.Value |
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.SelectMany(e => new[] { e.Point1, e.Point2, e.Point3 }) |
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.Distinct() |
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.ToList(); |
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foreach (var dic in gridleList) |
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{ |
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List<Vector3> tempPoints = new List<Vector3>(); |
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foreach (var entity in dic.Value) |
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{ |
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tempPoints.Add(entity.Point1); |
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tempPoints.Add(entity.Point2); |
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tempPoints.Add(entity.Point3); |
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} |
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resultPoints.Add(dic.Key, ViewportHelperPro.VectorClockwiseSort(new HashSet<Vector3>(tempPoints).ToList())); |
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} |
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// List<Vector3> selFaceVector = new List<Vector3>(); |
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// if (waistList.Count > 0) |
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// { |
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// foreach (var entity in waistList) |
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// { |
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// selFaceVector.Add(entity.Point1); |
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// selFaceVector.Add(entity.Point2); |
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// selFaceVector.Add(entity.Point3); |
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// } |
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// } |
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// resultPoints.Add("yao", selFaceVector); |
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StringBuilder sb = new StringBuilder(); |
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// 顶点列表 |
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List<Vector3> uniqueVertices = new List<Vector3>(); |
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Dictionary<Vector3, int> vertexIndexMap = new Dictionary<Vector3, int>(); |
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// 1. 对每个面生成顶点和面 |
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foreach (var face in resultPoints) |
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// 按凸包算法排序顶点（避免交叉） |
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var sortedVertices = ConvexHullSort(vertices); |
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// 计算面的法线（基于排序后的顶点） |
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var normal = CalculateFaceNormal(sortedVertices, ViewportManager.CenterVector); |
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// 存储面数据 |
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faceData[group.Key] = new FaceData |
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{ |
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// 对每个面，获取它的顶点列表 |
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List<Vector3> faceVertices = face.Value; |
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Vertices = sortedVertices, |
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Normal = normal |
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}; |
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} |
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// 去重顶点 |
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foreach (var vertex in faceVertices) |
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// Step 2: 写入 OBJ 文件 |
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using (var writer = new StreamWriter(outputPath)) |
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{ |
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// 写入顶点 |
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var vertexIndexMap = new Dictionary<Vector3, int>(); |
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int index = 1; |
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foreach (var face in faceData.Values) |
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{ |
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foreach (var vertex in face.Vertices) |
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{ |
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if (!vertexIndexMap.ContainsKey(vertex)) |
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{ |
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vertexIndexMap[vertex] = uniqueVertices.Count; |
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uniqueVertices.Add(vertex); |
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vertexIndexMap[vertex] = index++; |
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writer.WriteLine($"v {vertex.X} {vertex.Y} {vertex.Z}"); |
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} |
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} |
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} |
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// 2. 写入顶点数据 |
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foreach (var vertex in uniqueVertices) |
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// 写入法线（每个面一个法线） |
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var normalIndexMap = new Dictionary<Vector3, int>(); |
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index = 1; |
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foreach (var face in faceData.Values) |
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{ |
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sb.AppendLine($"v {vertex.X} {vertex.Y} {vertex.Z}"); |
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} |
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// 3. 写入每个面（f行），包括正面和反面 |
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foreach (var face in resultPoints) |
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{ |
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sb.AppendLine($"# Face: {face.Key}"); |
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// 获取面上的所有顶点并排序 |
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List<Vector3> faceVertices = face.Value; |
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if (!face.Key.StartsWith("11_")) |
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if (!normalIndexMap.ContainsKey(face.Normal)) |
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{ |
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Vector3 center = GetCenterOfVertices(faceVertices); |
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faceVertices.Sort((v1, v2) => GetAngle(v1, center).CompareTo(GetAngle(v2, center))); |
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normalIndexMap[face.Normal] = index++; |
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// writer.WriteLine($"vn {face.Normal.X} {face.Normal.Y} {face.Normal.Z}"); |
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} |
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} |
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// 写入面 |
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foreach (var faceEntry in faceData) |
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{ |
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var face = faceEntry.Value; |
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var normalIndex = normalIndexMap[face.Normal]; |
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// 正面：按顺时针顺序输出 |
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sb.Append("f"); |
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foreach (var vertex in faceVertices) |
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// 正面（顺时针） |
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writer.Write("f "); |
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foreach (var vertex in face.Vertices) |
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{ |
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sb.Append($" {vertexIndexMap[vertex] + 1}"); |
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writer.Write($"{vertexIndexMap[vertex]}//{normalIndex} "); |
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} |
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sb.AppendLine(); |
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writer.WriteLine(); |
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// 反面：按逆时针顺序输出（反转顶点顺序） |
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sb.Append("f"); |
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for (int i = faceVertices.Count - 1; i >= 0; i--) |
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// 反面（逆时针） |
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writer.Write("f "); |
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foreach (var vertex in face.Vertices.AsEnumerable().Reverse()) |
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{ |
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sb.Append($" {vertexIndexMap[faceVertices[i]] + 1}"); |
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writer.Write($"{vertexIndexMap[vertex]}//{normalIndex} "); |
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} |
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sb.AppendLine(); |
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writer.WriteLine(); |
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} |
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// 4. 写入文件 |
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File.WriteAllText(outputPath, sb.ToString()); |
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} |
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} |
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// 计算一组顶点的中心点（用于排序） |
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private static Vector3 GetCenterOfVertices(List<Vector3> vertices) |
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/// <summary> |
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/// 凸包排序（Andrew's Monotone Chain 算法） |
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/// </summary> |
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private static List<Vector3> ConvexHullSort(List<Vector3> points) |
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{ |
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float centerX = 0, centerY = 0, centerZ = 0; |
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foreach (var vertex in vertices) |
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if (points.Count <= 3) return points; |
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// 按 X 坐标排序，若相同则按 Y 排序 |
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var sorted = points.OrderBy(p => p.X).ThenBy(p => p.Y).ToList(); |
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// 构建下凸包和上凸包 |
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var lower = new List<Vector3>(); |
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foreach (var p in sorted) |
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{ |
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centerX += vertex.X; |
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centerY += vertex.Y; |
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centerZ += vertex.Z; |
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while (lower.Count >= 2 && Cross(lower[lower.Count - 2], lower[lower.Count - 1], p) <= 0) |
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lower.RemoveAt(lower.Count - 1); |
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lower.Add(p); |
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} |
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return new Vector3(centerX / vertices.Count, centerY / vertices.Count, centerZ / vertices.Count); |
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} |
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private static float GetAngle(Vector3 vertex, Vector3 center) |
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{ |
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// 计算顶点与中心的方向向量 |
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Vector3 direction = vertex - center; |
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var upper = new List<Vector3>(); |
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foreach (var p in sorted.AsEnumerable().Reverse()) |
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{ |
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while (upper.Count >= 2 && Cross(upper[upper.Count - 2], upper[upper.Count - 1], p) <= 0) |
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upper.RemoveAt(upper.Count - 1); |
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upper.Add(p); |
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} |
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// 在XY平面上计算角度 |
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float angle = (float)Math.Atan2(direction.Y, direction.X); // 返回的是弧度，[-π, π] |
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// 合并凸包（移除重复点） |
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lower.RemoveAt(lower.Count - 1); |
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upper.RemoveAt(upper.Count - 1); |
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return lower.Concat(upper).ToList(); |
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} |
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// 如果你想要角度范围 [0, 2π]，可以做如下处理 |
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if (angle < 0) |
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/// <summary> |
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/// 计算叉积 (p2-p0) × (p1-p0) |
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/// </summary> |
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private static float Cross(Vector3 p0, Vector3 p1, Vector3 p2) |
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{ |
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return (p1.X - p0.X) * (p2.Z - p0.Z) - (p1.Z - p0.Z) * (p2.X - p0.X); |
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} |
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/// <summary> |
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/// 计算面的法线（基于顶点顺序） |
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/// </summary> |
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private static Vector3 CalculateFaceNormal(List<Vector3> vertices, Vector3 modelCenter) |
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{ |
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// 使用前三个顶点计算初始法线 |
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var p0 = vertices[0]; |
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var p1 = vertices[1]; |
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var p2 = vertices[2]; |
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var edge1 = p1 - p0; |
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var edge2 = p2 - p0; |
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var normal = Vector3.Cross(edge1, edge2).Normalized(); |
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// 确保法线朝外（面中心到模型中心的向量与法线方向一致） |
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var faceCenter = GetCenter(vertices); |
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var toModelCenter = modelCenter - faceCenter; |
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if (Vector3.Dot(normal, toModelCenter) > 0) |
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{ |
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angle += MathF.PI * 2; |
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normal = -normal; |
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} |
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return angle; |
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return normal; |
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} |
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/// <summary> |
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/// 计算顶点列表的中心点 |
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/// </summary> |
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private static Vector3 GetCenter(List<Vector3> vertices) |
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{ |
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var center = Vector3.Zero; |
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foreach (var v in vertices) center += v; |
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return center / vertices.Count; |
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} |
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} |
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class FaceData |
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{ |
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public List<Vector3> Vertices { get; set; } |
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public Vector3 Normal { get; set; } |
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} |
Tongg
4 months ago