绘制三维实体
绘制复杂实体时，使用扫掠功能可能会出现图形颠倒的情况。在查询相关信息后未找到明确的解决方案，根据多个测试路径，发现可能由于路径的前（从左到右）两个点影响。当第二个点的y轴大于第一个点的y轴时，图形会颠倒。故判断从左到右的前两个点，若会导致结果颠倒，则先将截面颠倒。
bool rotate = (point[0].X < point[point.Count - 1].X) ? (point[0].Y < point[1].Y) : (point[point.Count - 1].Y < point[point.Count - 2].Y);
if (rotate)
{
Matrix3d rotationMatrix = Matrix3d.Rotation(Math.PI, Vector3d.XAxis, Point3d.Origin);
sectionEnt.TransformBy(rotationMatrix);
}
扫掠的主要部分，调用函数提供截面以及路径和 SweepOptionsBuilder：
SweepOptionsBuilder sweepOptionsBuilder = new SweepOptionsBuilder();
sweepOptionsBuilder.Align = SweepOptionsAlignOption.AlignSweepEntityToPath;
sweepOptionsBuilder.BasePoint = pathEnt.StartPoint;
sweepOptionsBuilder.Bank = true;
Solid3d sweepEnt1 = new Solid3d();
sweepEnt1.CreateSweptSolid(sectionEnt, pathEnt, sweepOptionsBuilder.ToSweepOptions());
sweepOptionsBuilder.Align有四种，但是我使用其他三种都会报错，因为使用此种方式，才会导致的图形颠倒；sweepOptionsBuilder.BasePoint为基点，我是将图形移到了路线的起点，然后将基点设为了路径的起点；最后bank属性让扫掠实体在沿路径扫掠时，随路径的方向变化而调整其朝向。
创建三维面函数：
SweptSurface sweepEnt1 = new SweptSurface();
sweepEnt1.CreateSweptSurface(sectionEnt1, pathEnt2,sweepOptionsBuilder.ToSweepOptions());
扫掠要求为一个对象，拱形需要把圆弧转成多段线，创建拱形代码：
double archHeight = (double)tunnel.other;
var centerPoint2 = new Point3d(width / 2, height, 0);
Arc arc2 = new Arc(centerPoint2, archHeight, 0, Math.PI);
int numSegments = 20;
for (int i = 0; i <= numSegments; i++)
{
double angle = (Math.PI / numSegments) * i; // 将弧均匀分成多个线段
double x = centerPoint2.X + archHeight * Math.Cos(angle);
double y = centerPoint2.Y + archHeight * Math.Sin(angle);
sectionEnt.AddVertexAt(i, new Point2d(x, y), 0.0, 0.0, 0.0);
}
// 截面实体
Polyline sectionEnt2 = new Polyline();
sectionEnt2.AddVertexAt(0, new Point2d(centerPoint2.X - archHeight, centerPoint2.Y-height), 0.0, 0.0, 0.0);
sectionEnt2.AddVertexAt(1, new Point2d(centerPoint2.X + archHeight, centerPoint2.Y - height), 0.0, 0.0, 0.0);
for (int i = 0; i < sectionEnt2.NumberOfVertices; i++)
{
sectionEnt.AddVertexAt(sectionEnt.NumberOfVertices, sectionEnt2.GetPoint2dAt(i), 0.0, 0.0, 0.0);
}
sectionEnt.Closed = true;
全部代码，扫掠矩形和拱形：
private static void xxxx(Database acCurDb, BlockTableRecord acBlkTblRec, Transaction acTrans, ThreeDimension.Tunnel3D tunnel)
{
try
{
var point = new Point3dCollection();
foreach (var roadway in tunnel.info)
{
if (roadway.start.X != "" && roadway.start.Y != "" && roadway.start.Z != "")
{
var p = new Point3d(double.Parse(roadway.start.X), double.Parse(roadway.start.Y), double.Parse(roadway.start.Z));
point.Add(p);
}
}
if (tunnel.info[tunnel.info.Count-1].end.X != "" && tunnel.info[tunnel.info.Count - 1].end.Y != "" && tunnel.info[tunnel.info.Count - 1].end.Z != "")
{
var p = new Point3d(double.Parse(tunnel.info[tunnel.info.Count - 1].end.X),
double.Parse(tunnel.info[tunnel.info.Count - 1].end.Y),
double.Parse(tunnel.info[tunnel.info.Count - 1].end.Z));
point.Add(p);
}
bool rotate = (point[0].X < point[point.Count - 1].X) ? (point[0].Y < point[1].Y) : (point[point.Count - 1].Y < point[point.Count - 2].Y);
// 截面实体
Polyline sectionEnt = new Polyline();
double width = (double)tunnel.width;
double height = (double)tunnel.height;
if (tunnel.rshape == 0)
{
sectionEnt.AddVertexAt(0, new Point2d(width, height), 0.0, 0.0, 0.0);
sectionEnt.AddVertexAt(1, new Point2d(width, 0), 0.0, 0.0, 0.0);
sectionEnt.AddVertexAt(2, new Point2d(0, 0), 0.0, 0.0, 0.0);
sectionEnt.AddVertexAt(3, new Point2d(0, height), 0.0, 0.0, 0.0);
sectionEnt.Closed = true;
}
else if(tunnel.rshape == 1)
{
double archHeight = (double)tunnel.other;
var centerPoint2 = new Point3d(width / 2, height, 0);
Arc arc2 = new Arc(centerPoint2, archHeight, 0, Math.PI);
int numSegments = 20;
for (int i = 0; i <= numSegments; i++)
{
double angle = (Math.PI / numSegments) * i; // 将弧均匀分成多个线段
double x = centerPoint2.X + archHeight * Math.Cos(angle);
double y = centerPoint2.Y + archHeight * Math.Sin(angle);
sectionEnt.AddVertexAt(i, new Point2d(x, y), 0.0, 0.0, 0.0);
}
// 截面实体
Polyline sectionEnt2 = new Polyline();
sectionEnt2.AddVertexAt(0, new Point2d(centerPoint2.X - archHeight, centerPoint2.Y-height), 0.0, 0.0, 0.0);
sectionEnt2.AddVertexAt(1, new Point2d(centerPoint2.X + archHeight, centerPoint2.Y - height), 0.0, 0.0, 0.0);
for (int i = 0; i < sectionEnt2.NumberOfVertices; i++)
{
sectionEnt.AddVertexAt(sectionEnt.NumberOfVertices, sectionEnt2.GetPoint2dAt(i), 0.0, 0.0, 0.0);
}
sectionEnt.Closed = true;
}
Polyline3d pathEnt = new Polyline3d(Poly3dType.SimplePoly, point, false);
if (rotate)
{
Matrix3d rotationMatrix = Matrix3d.Rotation(Math.PI, Vector3d.XAxis, Point3d.Origin);
sectionEnt.TransformBy(rotationMatrix);
}
Matrix3d moveMatrix = Matrix3d.Displacement(new Vector3d(point[0].X - width, point[0].Y - height, point[0].Z));
sectionEnt.TransformBy(moveMatrix);
SweepOptionsBuilder sweepOptionsBuilder = new SweepOptionsBuilder();
sweepOptionsBuilder.Align = SweepOptionsAlignOption.AlignSweepEntityToPath;
sweepOptionsBuilder.BasePoint = pathEnt.StartPoint;
sweepOptionsBuilder.Bank = true;
Solid3d sweepEnt1 = new Solid3d();
sweepEnt1.CreateSweptSolid(sectionEnt, pathEnt, sweepOptionsBuilder.ToSweepOptions());
sweepEnt1.ColorIndex = 7;
using (Transaction tr = acCurDb.TransactionManager.StartTransaction())
{
acBlkTblRec.AppendEntity(sweepEnt1);
acTrans.AddNewlyCreatedDBObject(sweepEnt1, true);
tr.Commit();
}
sweepEnt1.Dispose();
}
catch (Exception ex)
{
}
}
视口相关配置，控制视图和视觉样式：
acVportTblRec.SetViewDirection(OrthographicView.RightView);
DBDictionary visualStyleDict = acTrans.GetObject(acCurDb.VisualStyleDictionaryId, OpenMode.ForRead) as DBDictionary;
if (visualStyleDict.Contains("Realistic"))
{
// 获取 "Realistic" 视觉样式的 ObjectId
visualStyleId = visualStyleDict.GetAt("Realistic");
}
acVportTblRec.VisualStyleId = visualStyleId;
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