602 lines
25 KiB
C#
602 lines
25 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.IO;
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using System.Text;
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using System.Linq;
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using Autodesk.AutoCAD.DatabaseServices;
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using Autodesk.AutoCAD.Geometry;
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using Autodesk.AutoCAD.BoundaryRepresentation;
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namespace FurnitureExporter
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{
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/// <summary>
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/// OBJ 格式导出器 (v2.0)
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/// 使用 Brep API 从 AutoCAD Solid3d 提取真实三角网格
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/// 保留开孔、倒角等几何细节
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/// </summary>
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public class ObjExporter
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{
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private readonly StringBuilder _vertices = new StringBuilder();
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private readonly StringBuilder _normals = new StringBuilder();
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private readonly StringBuilder _faces = new StringBuilder();
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private readonly Dictionary<string, int> _vertexIndexMap = new Dictionary<string, int>();
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private readonly Dictionary<string, int> _normalIndexMap = new Dictionary<string, int>();
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private int _vertexCount = 0;
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private int _normalCount = 0;
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private int _solidCount = 0;
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private int _faceCount = 0;
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private Point3d _originOffset = Point3d.Origin;
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// 网格密度控制参数
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private double _meshDensityFactor = 45.0; // 默认改为更保守的密度，减少大平面过度细分
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private int _maxSubdivisions = 20000; // 默认降低最大细分次数，避免简单板件导出异常膨胀
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/// <summary>
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/// 设置网格密度因子（默认 100，值越大网格越密，文件越大）
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/// </summary>
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public void SetMeshDensity(double densityFactor, int maxSubdivisions = 20000)
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{
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_meshDensityFactor = Math.Max(10, Math.Min(200, densityFactor));
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_maxSubdivisions = Math.Max(1000, Math.Min(200000, maxSubdivisions));
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}
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/// <summary>
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/// 设置原点偏移（将模型移动到世界原点）
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/// </summary>
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public void SetOriginOffset(Point3d offset)
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{
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_originOffset = offset;
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}
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private static string BuildVertexKey(Point3d point)
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{
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return string.Format(
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CultureInfo.InvariantCulture,
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"{0:F6}|{1:F6}|{2:F6}",
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point.X,
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point.Y,
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point.Z
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);
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}
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private static string BuildNormalKey(Vector3d normal)
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{
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return string.Format(
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CultureInfo.InvariantCulture,
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"{0:F6}|{1:F6}|{2:F6}",
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normal.X,
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normal.Y,
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normal.Z
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);
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}
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private int GetOrCreateVertexIndex(Point3d point)
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{
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var key = BuildVertexKey(point);
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if (_vertexIndexMap.TryGetValue(key, out var existingIndex))
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{
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return existingIndex;
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}
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_vertices.AppendLine(string.Format(CultureInfo.InvariantCulture,
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"v {0:F6} {1:F6} {2:F6}", point.X, point.Y, point.Z));
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_vertexCount++;
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_vertexIndexMap[key] = _vertexCount;
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return _vertexCount;
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}
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private int GetOrCreateNormalIndex(Vector3d normal)
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{
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var key = BuildNormalKey(normal);
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if (_normalIndexMap.TryGetValue(key, out var existingIndex))
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{
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return existingIndex;
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}
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_normals.AppendLine(string.Format(CultureInfo.InvariantCulture,
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"vn {0:F6} {1:F6} {2:F6}", normal.X, normal.Y, normal.Z));
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_normalCount++;
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_normalIndexMap[key] = _normalCount;
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return _normalCount;
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}
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private double CalculateMaxNodeSpacing(Extents3d extents)
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{
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var size = extents.MinPoint.GetVectorTo(extents.MaxPoint);
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var longestEdge = Math.Max(size.X, Math.Max(size.Y, size.Z));
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var spacingByDensity = longestEdge / _meshDensityFactor;
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// 约束取值：
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// - 过小会导致大平面和倒角被极度细分
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// - 过大又会明显破坏孔和边缘观感
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return Math.Max(4.0, Math.Min(18.0, spacingByDensity));
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}
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/// <summary>
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/// 添加任意支持的实体到 OBJ 导出器
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/// </summary>
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public void AddEntity(Entity entity, string? name = null)
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{
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if (entity == null) return;
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if (entity is Solid3d solid)
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{
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AddSolid(solid, name);
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return;
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}
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if (entity is BlockReference blockReference)
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{
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AddBlockReference(blockReference, name);
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}
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}
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/// <summary>
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/// 使用 Brep API 添加一个 Solid3d 实体（提取真实几何）
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/// </summary>
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public void AddSolid(Solid3d solid, string? name = null)
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{
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if (solid == null) return;
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try
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{
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_solidCount++;
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var solidName = name ?? $"panel_{_solidCount - 1:D3}";
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var extents = solid.GeometricExtents;
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// 对象名必须与该对象的面一起输出；否则 obj2gltf 会把全部面归到最后一个对象
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_faces.AppendLine($"o {solidName}");
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// 使用 Brep API 提取真实几何
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using (var brep = new Brep(solid))
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{
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using (var meshControl = new Mesh2dControl())
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{
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// 设置网格控制参数
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// MaxNodeSpacing 控制网格点之间的最大距离
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meshControl.MaxNodeSpacing = CalculateMaxNodeSpacing(extents);
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meshControl.MaxSubdivisions = (uint)_maxSubdivisions;
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using (var meshFilter = new Mesh2dFilter())
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{
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// 将控制参数应用到 Brep
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meshFilter.Insert(brep, meshControl);
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using (var mesh = new Mesh2d(meshFilter))
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{
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// 遍历网格元素（三角形或四边形）
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foreach (Element2d element in mesh.Element2ds)
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{
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var points = new List<Point3d>();
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// 提取元素的顶点
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foreach (Node node in element.Nodes)
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{
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// 应用原点偏移
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var point = new Point3d(
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node.Point.X + _originOffset.X,
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node.Point.Y + _originOffset.Y,
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node.Point.Z + _originOffset.Z
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);
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points.Add(point);
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// 必须显式 Dispose 节点，否则会崩溃
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node.Dispose();
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}
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// 必须显式 Dispose 元素，否则会崩溃
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element.Dispose();
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if (points.Count < 3) continue;
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// 计算面法线
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Vector3d normal = CalculateFaceNormal(points);
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var normalIndex = GetOrCreateNormalIndex(normal);
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// 写入顶点（复用相同坐标，避免 OBJ 文本重复膨胀）
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var vertexIndices = new List<int>();
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foreach (var pt in points)
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{
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vertexIndices.Add(GetOrCreateVertexIndex(pt));
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}
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// 写入面
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if (points.Count == 3)
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{
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// 三角形
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndex} {vertexIndices[1]}//{normalIndex} {vertexIndices[2]}//{normalIndex}");
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_faceCount++;
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}
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else if (points.Count == 4)
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{
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// 四边形 - 拆分为两个三角形
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndex} {vertexIndices[1]}//{normalIndex} {vertexIndices[2]}//{normalIndex}");
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndex} {vertexIndices[2]}//{normalIndex} {vertexIndices[3]}//{normalIndex}");
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_faceCount += 2;
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}
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else
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{
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// 多边形 - 扇形三角化
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for (int i = 1; i < points.Count - 1; i++)
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{
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndex} {vertexIndices[i]}//{normalIndex} {vertexIndices[i + 1]}//{normalIndex}");
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_faceCount++;
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}
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}
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}
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}
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}
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}
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}
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}
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catch (Autodesk.AutoCAD.Runtime.Exception ex)
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{
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// Brep API 失败时回退到边界框方法
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System.Diagnostics.Debug.WriteLine($"Brep 导出失败，回退到边界框: {ex.Message}");
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AddSolidBoundingBox(solid, name);
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}
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catch (System.Exception ex)
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{
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System.Diagnostics.Debug.WriteLine($"导出 Solid3d 失败: {ex.Message}");
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// 尝试回退到边界框
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try
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{
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AddSolidBoundingBox(solid, name);
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}
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catch
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{
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// 完全失败，跳过此实体
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}
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}
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}
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/// <summary>
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/// 尝试展开图块引用并导出内部几何。
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/// 如果图块内部没有可导出的 3D 实体，则退化为包围盒模型，至少保证资产中心有模型可用。
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/// </summary>
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private void AddBlockReference(BlockReference blockReference, string? name = null)
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{
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if (blockReference == null) return;
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var exploded = new DBObjectCollection();
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try
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{
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blockReference.Explode(exploded);
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var baseName = name ?? $"block_{_solidCount:D3}";
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var childIndex = 0;
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var exportedAny = false;
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foreach (DBObject dbObject in exploded)
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{
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if (dbObject is not Entity entity)
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{
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continue;
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}
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if (entity is not Solid3d && entity is not BlockReference)
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{
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continue;
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}
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AddEntity(entity, $"{baseName}_{childIndex:D3}");
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childIndex++;
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exportedAny = true;
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}
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if (!exportedAny)
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{
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AddBlockReferenceBoundingBox(blockReference, baseName);
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}
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}
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catch (System.Exception ex)
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{
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System.Diagnostics.Debug.WriteLine($"导出 BlockReference 失败，回退到边界框: {ex.Message}");
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AddBlockReferenceBoundingBox(blockReference, name);
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}
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finally
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{
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foreach (DBObject dbObject in exploded)
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{
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dbObject.Dispose();
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}
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}
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}
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/// <summary>
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/// 图块引用的包围盒导出（回退方案）
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/// </summary>
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private void AddBlockReferenceBoundingBox(BlockReference blockReference, string? name = null)
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{
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if (blockReference == null) return;
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_solidCount++;
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var solidName = name ?? $"block_{_solidCount - 1:D3}";
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var extents = blockReference.GeometricExtents;
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var min = extents.MinPoint;
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var max = extents.MaxPoint;
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var minOffset = new Point3d(min.X + _originOffset.X, min.Y + _originOffset.Y, min.Z + _originOffset.Z);
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var maxOffset = new Point3d(max.X + _originOffset.X, max.Y + _originOffset.Y, max.Z + _originOffset.Z);
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var vertices = new Point3d[]
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{
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new Point3d(minOffset.X, minOffset.Y, minOffset.Z),
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new Point3d(maxOffset.X, minOffset.Y, minOffset.Z),
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new Point3d(maxOffset.X, maxOffset.Y, minOffset.Z),
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new Point3d(minOffset.X, maxOffset.Y, minOffset.Z),
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new Point3d(minOffset.X, minOffset.Y, maxOffset.Z),
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new Point3d(maxOffset.X, minOffset.Y, maxOffset.Z),
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new Point3d(maxOffset.X, maxOffset.Y, maxOffset.Z),
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new Point3d(minOffset.X, maxOffset.Y, maxOffset.Z),
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};
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_faces.AppendLine($"o {solidName}");
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var vertexIndices = vertices.Select(GetOrCreateVertexIndex).ToArray();
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var normalIndices = new int[]
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{
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GetOrCreateNormalIndex(new Vector3d(0, 0, -1)),
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GetOrCreateNormalIndex(new Vector3d(0, 0, 1)),
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GetOrCreateNormalIndex(new Vector3d(0, -1, 0)),
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GetOrCreateNormalIndex(new Vector3d(0, 1, 0)),
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GetOrCreateNormalIndex(new Vector3d(-1, 0, 0)),
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GetOrCreateNormalIndex(new Vector3d(1, 0, 0)),
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};
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[0]} {vertexIndices[2]}//{normalIndices[0]} {vertexIndices[1]}//{normalIndices[0]}");
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[0]} {vertexIndices[3]}//{normalIndices[0]} {vertexIndices[2]}//{normalIndices[0]}");
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_faces.AppendLine($"f {vertexIndices[4]}//{normalIndices[1]} {vertexIndices[5]}//{normalIndices[1]} {vertexIndices[6]}//{normalIndices[1]}");
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_faces.AppendLine($"f {vertexIndices[4]}//{normalIndices[1]} {vertexIndices[6]}//{normalIndices[1]} {vertexIndices[7]}//{normalIndices[1]}");
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[2]} {vertexIndices[1]}//{normalIndices[2]} {vertexIndices[5]}//{normalIndices[2]}");
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[2]} {vertexIndices[5]}//{normalIndices[2]} {vertexIndices[4]}//{normalIndices[2]}");
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_faces.AppendLine($"f {vertexIndices[2]}//{normalIndices[3]} {vertexIndices[3]}//{normalIndices[3]} {vertexIndices[7]}//{normalIndices[3]}");
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_faces.AppendLine($"f {vertexIndices[2]}//{normalIndices[3]} {vertexIndices[7]}//{normalIndices[3]} {vertexIndices[6]}//{normalIndices[3]}");
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[4]} {vertexIndices[4]}//{normalIndices[4]} {vertexIndices[7]}//{normalIndices[4]}");
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[4]} {vertexIndices[7]}//{normalIndices[4]} {vertexIndices[3]}//{normalIndices[4]}");
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_faces.AppendLine($"f {vertexIndices[1]}//{normalIndices[5]} {vertexIndices[2]}//{normalIndices[5]} {vertexIndices[6]}//{normalIndices[5]}");
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_faces.AppendLine($"f {vertexIndices[1]}//{normalIndices[5]} {vertexIndices[6]}//{normalIndices[5]} {vertexIndices[5]}//{normalIndices[5]}");
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_faceCount += 12;
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}
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/// <summary>
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/// 计算面法线（使用 Newell 方法，适用于任意多边形）
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/// </summary>
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private Vector3d CalculateFaceNormal(List<Point3d> points)
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{
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double nx = 0, ny = 0, nz = 0;
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int n = points.Count;
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for (int i = 0; i < n; i++)
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{
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var current = points[i];
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var next = points[(i + 1) % n];
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nx += (current.Y - next.Y) * (current.Z + next.Z);
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ny += (current.Z - next.Z) * (current.X + next.X);
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nz += (current.X - next.X) * (current.Y + next.Y);
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}
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var normal = new Vector3d(nx, ny, nz);
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// 归一化
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double length = normal.Length;
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if (length > 1e-10)
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{
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normal = normal.DivideBy(length);
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}
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else
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{
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// 如果法线接近零，使用默认值
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normal = new Vector3d(0, 0, 1);
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}
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return normal;
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}
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/// <summary>
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/// 使用边界框方法添加实体（作为回退方案）
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/// </summary>
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private void AddSolidBoundingBox(Solid3d solid, string? name = null)
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{
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if (solid == null) return;
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_solidCount++;
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var solidName = name ?? $"panel_{_solidCount - 1:D3}";
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// 获取实体的边界框
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var extents = solid.GeometricExtents;
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var min = extents.MinPoint;
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var max = extents.MaxPoint;
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// 应用原点偏移
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var minOffset = new Point3d(min.X + _originOffset.X, min.Y + _originOffset.Y, min.Z + _originOffset.Z);
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var maxOffset = new Point3d(max.X + _originOffset.X, max.Y + _originOffset.Y, max.Z + _originOffset.Z);
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// 生成长方体的 8 个顶点
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var vertices = new Point3d[]
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{
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new Point3d(minOffset.X, minOffset.Y, minOffset.Z), // 0: 前左下
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new Point3d(maxOffset.X, minOffset.Y, minOffset.Z), // 1: 前右下
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new Point3d(maxOffset.X, maxOffset.Y, minOffset.Z), // 2: 后右下
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new Point3d(minOffset.X, maxOffset.Y, minOffset.Z), // 3: 后左下
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new Point3d(minOffset.X, minOffset.Y, maxOffset.Z), // 4: 前左上
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new Point3d(maxOffset.X, minOffset.Y, maxOffset.Z), // 5: 前右上
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new Point3d(maxOffset.X, maxOffset.Y, maxOffset.Z), // 6: 后右上
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new Point3d(minOffset.X, maxOffset.Y, maxOffset.Z), // 7: 后左上
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};
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// 对象名必须与该对象的面一起输出；否则 obj2gltf 会把全部面归到最后一个对象
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_faces.AppendLine($"o {solidName}");
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var vertexIndices = vertices.Select(GetOrCreateVertexIndex).ToArray();
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var normalIndices = new int[]
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{
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GetOrCreateNormalIndex(new Vector3d(0, 0, -1)),
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GetOrCreateNormalIndex(new Vector3d(0, 0, 1)),
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GetOrCreateNormalIndex(new Vector3d(0, -1, 0)),
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GetOrCreateNormalIndex(new Vector3d(0, 1, 0)),
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GetOrCreateNormalIndex(new Vector3d(-1, 0, 0)),
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GetOrCreateNormalIndex(new Vector3d(1, 0, 0)),
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};
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// 底面 (Z min)
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_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[0]} {vertexIndices[2]}//{normalIndices[0]} {vertexIndices[1]}//{normalIndices[0]}");
|
||
_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[0]} {vertexIndices[3]}//{normalIndices[0]} {vertexIndices[2]}//{normalIndices[0]}");
|
||
|
||
// 顶面 (Z max)
|
||
_faces.AppendLine($"f {vertexIndices[4]}//{normalIndices[1]} {vertexIndices[5]}//{normalIndices[1]} {vertexIndices[6]}//{normalIndices[1]}");
|
||
_faces.AppendLine($"f {vertexIndices[4]}//{normalIndices[1]} {vertexIndices[6]}//{normalIndices[1]} {vertexIndices[7]}//{normalIndices[1]}");
|
||
|
||
// 前面 (Y min)
|
||
_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[2]} {vertexIndices[1]}//{normalIndices[2]} {vertexIndices[5]}//{normalIndices[2]}");
|
||
_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[2]} {vertexIndices[5]}//{normalIndices[2]} {vertexIndices[4]}//{normalIndices[2]}");
|
||
|
||
// 后面 (Y max)
|
||
_faces.AppendLine($"f {vertexIndices[2]}//{normalIndices[3]} {vertexIndices[3]}//{normalIndices[3]} {vertexIndices[7]}//{normalIndices[3]}");
|
||
_faces.AppendLine($"f {vertexIndices[2]}//{normalIndices[3]} {vertexIndices[7]}//{normalIndices[3]} {vertexIndices[6]}//{normalIndices[3]}");
|
||
|
||
// 左面 (X min)
|
||
_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[4]} {vertexIndices[4]}//{normalIndices[4]} {vertexIndices[7]}//{normalIndices[4]}");
|
||
_faces.AppendLine($"f {vertexIndices[0]}//{normalIndices[4]} {vertexIndices[7]}//{normalIndices[4]} {vertexIndices[3]}//{normalIndices[4]}");
|
||
|
||
// 右面 (X max)
|
||
_faces.AppendLine($"f {vertexIndices[1]}//{normalIndices[5]} {vertexIndices[2]}//{normalIndices[5]} {vertexIndices[6]}//{normalIndices[5]}");
|
||
_faces.AppendLine($"f {vertexIndices[1]}//{normalIndices[5]} {vertexIndices[6]}//{normalIndices[5]} {vertexIndices[5]}//{normalIndices[5]}");
|
||
|
||
_faceCount += 12;
|
||
}
|
||
|
||
/// <summary>
|
||
/// 保存为 OBJ 文件
|
||
/// </summary>
|
||
public void Save(string outputPath)
|
||
{
|
||
var content = new StringBuilder();
|
||
|
||
// 文件头
|
||
content.AppendLine("# Furniture Exporter OBJ File (v2.0 - True Geometry)");
|
||
content.AppendLine($"# Generated: {DateTime.Now:yyyy-MM-dd HH:mm:ss}");
|
||
content.AppendLine($"# Solids: {_solidCount}");
|
||
content.AppendLine($"# Vertices: {_vertexCount}");
|
||
content.AppendLine($"# Normals: {_normalCount}");
|
||
content.AppendLine($"# Faces: {_faceCount}");
|
||
content.AppendLine();
|
||
|
||
// 顶点
|
||
content.Append(_vertices);
|
||
content.AppendLine();
|
||
|
||
// 法线
|
||
content.Append(_normals);
|
||
content.AppendLine();
|
||
|
||
// 面（包含对象分组标记）
|
||
content.Append(_faces);
|
||
|
||
File.WriteAllText(outputPath, content.ToString(), Encoding.UTF8);
|
||
}
|
||
|
||
/// <summary>
|
||
/// 获取统计信息
|
||
/// </summary>
|
||
public (int Solids, int Vertices, int Normals, int Faces) GetStats()
|
||
{
|
||
return (_solidCount, _vertexCount, _normalCount, _faceCount);
|
||
}
|
||
|
||
/// <summary>
|
||
/// 导出多个实体到 OBJ 文件
|
||
/// </summary>
|
||
/// <param name="solidIds">实体 ID 数组</param>
|
||
/// <param name="outputPath">输出文件路径</param>
|
||
/// <param name="originOffset">原点偏移（可选，用于将模型移动到世界原点）</param>
|
||
/// <param name="meshDensity">网格密度因子（可选，默认 45）</param>
|
||
/// <param name="maxSubdivisions">最大细分次数（可选，默认 20000）</param>
|
||
public static void Export(
|
||
ObjectId[] solidIds,
|
||
string outputPath,
|
||
Point3d? originOffset = null,
|
||
double meshDensity = 45,
|
||
int maxSubdivisions = 20000)
|
||
{
|
||
var exporter = new ObjExporter();
|
||
|
||
if (originOffset.HasValue)
|
||
{
|
||
exporter.SetOriginOffset(originOffset.Value);
|
||
}
|
||
|
||
exporter.SetMeshDensity(meshDensity, maxSubdivisions);
|
||
|
||
var db = solidIds[0].Database;
|
||
|
||
using (var tr = db.TransactionManager.StartTransaction())
|
||
{
|
||
int index = 0;
|
||
foreach (var id in solidIds)
|
||
{
|
||
var solid = tr.GetObject(id, OpenMode.ForRead) as Solid3d;
|
||
if (solid != null)
|
||
{
|
||
exporter.AddSolid(solid, $"panel_{index:D3}");
|
||
index++;
|
||
}
|
||
}
|
||
tr.Commit();
|
||
}
|
||
|
||
exporter.Save(outputPath);
|
||
}
|
||
|
||
/// <summary>
|
||
/// 导出多个实体（3D Solid / BlockReference）到 OBJ 文件
|
||
/// </summary>
|
||
public static void ExportEntities(
|
||
ObjectId[] entityIds,
|
||
string outputPath,
|
||
Database db,
|
||
Point3d? originOffset = null,
|
||
double meshDensity = 45,
|
||
int maxSubdivisions = 20000)
|
||
{
|
||
var exporter = new ObjExporter();
|
||
|
||
if (originOffset.HasValue)
|
||
{
|
||
exporter.SetOriginOffset(originOffset.Value);
|
||
}
|
||
|
||
exporter.SetMeshDensity(meshDensity, maxSubdivisions);
|
||
|
||
using (var tr = db.TransactionManager.StartTransaction())
|
||
{
|
||
int index = 0;
|
||
foreach (var id in entityIds)
|
||
{
|
||
var entity = tr.GetObject(id, OpenMode.ForRead) as Entity;
|
||
if (entity == null)
|
||
{
|
||
continue;
|
||
}
|
||
|
||
exporter.AddEntity(entity, $"asset_{index:D3}");
|
||
index++;
|
||
}
|
||
tr.Commit();
|
||
}
|
||
|
||
exporter.Save(outputPath);
|
||
}
|
||
}
|
||
}
|