AutoCAD 2010的C＃实体放样示例——天圆地方
AutoCAD 2010的那两个托管DLL文件中，增加了对“放样”和“扫琼”的支持，使得我们用C＃进行三维建模的手段更加丰富了！以前的CAD版本，用C＃能进行“放样曲面”和“扫琼曲面”的操作，但不能进行实体的操作。
// 放样示例：天圆地方.
public void Test()
{
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
Polyline ent1 = new Polyline();
ent1.AddVertexAt(0, new Point2d(50, 50), 0, 0, 0);
ent1.AddVertexAt(1, new Point2d(-50, 50), 0, 0, 0);
ent1.AddVertexAt(2, new Point2d(-50, -50), 0, 0, 0);
ent1.AddVertexAt(3, new Point2d(50, -50), 0, 0, 0);
ent1.Closed = true;
Circle ent2 = new Circle(new Point3d(0, 0, 200), new Vector3d(0, 0, 1), 30);
Entity[] crossEnts = new Entity;
crossEnts.SetValue(ent1, 0);
crossEnts.SetValue(ent2, 1);
Entity[] guideCurs = new Entity;
LoftOptions loftOpt = new LoftOptions();
Solid3d solid3dEnt = new Solid3d();
solid3dEnt.RecordHistory = true;
solid3dEnt.CreateLoftedSolid(crossEnts, guideCurs, null, loftOpt);
AppendEntity(solid3dEnt);
}
ObjectId AppendEntity(Entity ent)
{
Database db = HostApplicationServices.WorkingDatabase;
ObjectId entId;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId,
OpenMode.ForRead);
BlockTableRecord btr = (BlockTableRecord)trans.GetObject
(bt, OpenMode.ForWrite);
entId = btr.AppendEntity(ent);
trans.AddNewlyCreatedDBObject(ent, true);
trans.Commit();
}
return entId;
}
<p>对3d的东西一向不太熟悉，相信各位朋友也一样，</p><p>但在AutoCad不断加强3d功能的现在，确实应该引起重视</p><p>也希望ahlzl斑竹多发一些相关的东西，：）</p> 紧急求助，需要一个VBA的例子，请ahlzl 斑竹不吝赐教呀！！！
天圆地方曲面
本帖最后由 lamntree 于 2015-9-12 20:53 编辑直接loft的天圆地方实际做钣金是做不出来的，我把它分成4个三角面，4个曲面，组合出来，这样就和实际钣金做出来的一样了
public void hopper3d()
{
Database db = HostApplicationServices.WorkingDatabase;
Document doc = Application.DocumentManager.MdiActiveDocument;
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
using (Transaction trans = db.TransactionManager.StartTransaction())
{
BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForRead);
BlockTableRecord btr = (BlockTableRecord)trans.GetObject(db.CurrentSpaceId, OpenMode.ForWrite);
PromptPointResult ppr = ed.GetPoint("\nspecify inset point");
if (ppr.Status == PromptStatus.OK)
{
Matrix3d UCS = ed.CurrentUserCoordinateSystem;
Point3d pt = ppr.Value.TransformBy(UCS);
PromptDoubleResult pdrDia = ed.GetDouble("\nspecify diameter of circle");
if (pdrDia.Status == PromptStatus.OK)
{
double D = pdrDia.Value;
PromptDoubleResult pdrL = ed.GetDouble("\nspecify Length");
if (pdrL.Status == PromptStatus.OK)
{
double L = pdrL.Value;
PromptDoubleResult pdrW = ed.GetDouble("\nspecify width");
if (pdrW.Status == PromptStatus.OK)
{
double W = pdrW.Value;
PromptDoubleResult pdrH = ed.GetDouble("\nspecify height");
if (pdrH.Status == PromptStatus.OK)
{
Application.SetSystemVariable("clayer", "0");
Vector3d vec = pt - new Point3d(0, 0, 0);
double H = pdrH.Value;
LoftOptions lo = new LoftOptions();
Line l1 = new Line(new Point3d(0, -D / 2, 0), new Point3d(-L / 2, -W / 2, -H));
l1.TransformBy(Matrix3d.Displacement(vec));
Line l2 = new Line(new Point3d(0, -D / 2, 0), new Point3d(L / 2, -W / 2, -H));
l2.TransformBy(Matrix3d.Displacement(vec));
Entity[] l1l2=new Entity[]{l1,l2};
LoftedSurface lf1 = new LoftedSurface();
lf1.CreateLoftedSurface(l1l2, null, null, lo);
btr.AppendEntity(lf1);
trans.AddNewlyCreatedDBObject(lf1, true);
Arc a1 = new Arc(new Point3d(0, 0, 0), D / 2, -Math .PI /2, 0);
a1.TransformBy(Matrix3d.Displacement(vec));
Entity[] l2a1 = new Entity[] { l2, a1 };
LoftedSurface lf2 = new LoftedSurface();
lf2.CreateLoftedSurface(l2a1, null, null, lo);
btr.AppendEntity(lf2);
trans.AddNewlyCreatedDBObject(lf2, true);
Line l3 = new Line(new Point3d(D / 2, 0, 0), new Point3d(L / 2, -W / 2, -H));
l3.TransformBy(Matrix3d.Displacement(vec));
Line l4 = new Line(new Point3d(D / 2, 0, 0), new Point3d(L / 2, W / 2, -H));
l4.TransformBy(Matrix3d.Displacement(vec));
Entity[] l3l4 = new Entity[] { l3, l4 };
LoftedSurface lf3 = new LoftedSurface();
lf3.CreateLoftedSurface(l3l4, null, null, lo);
btr.AppendEntity(lf3);
trans.AddNewlyCreatedDBObject(lf3, true);
Arc a2 = new Arc(new Point3d(0, 0, 0), D / 2,0,Math.PI / 2);
a2.TransformBy(Matrix3d.Displacement(vec));
Entity[] l4a2 = new Entity[] { l4, a2 };
LoftedSurface lf4 = new LoftedSurface();
lf4.CreateLoftedSurface(l4a2, null, null, lo);
btr.AppendEntity(lf4);
trans.AddNewlyCreatedDBObject(lf4, true);
Line l5 = new Line(new Point3d(0, D / 2, 0), new Point3d(L / 2, W / 2, -H));
l5.TransformBy(Matrix3d.Displacement(vec));
Line l6 = new Line(new Point3d(0, D / 2, 0), new Point3d(-L / 2, W / 2, -H));
l6.TransformBy(Matrix3d.Displacement(vec));
Entity[] l5l6 = new Entity[] { l5, l6 };
LoftedSurface lf5 = new LoftedSurface();
lf5.CreateLoftedSurface(l5l6, null, null, lo);
btr.AppendEntity(lf5);
trans.AddNewlyCreatedDBObject(lf5, true);
Arc a3 = new Arc(new Point3d(0, 0, 0), D / 2, Math.PI / 2,Math.PI );
a3.TransformBy(Matrix3d.Displacement(vec));
Entity[] l6a3 = new Entity[] { l6, a3 };
LoftedSurface lf6 = new LoftedSurface();
lf6.CreateLoftedSurface(l6a3, null, null, lo);
btr.AppendEntity(lf6);
trans.AddNewlyCreatedDBObject(lf6, true);
Line l7 = new Line(new Point3d(-D / 2,0, 0), new Point3d(-L / 2, W / 2, -H));
l7.TransformBy(Matrix3d.Displacement(vec));
Line l8 = new Line(new Point3d(-D / 2, 0, 0), new Point3d(-L / 2, -W / 2, -H));
l8.TransformBy(Matrix3d.Displacement(vec));
Entity[] l7l8 = new Entity[] { l7, l8 };
LoftedSurface lf7 = new LoftedSurface();
lf7.CreateLoftedSurface(l7l8, null, null, lo);
btr.AppendEntity(lf7);
trans.AddNewlyCreatedDBObject(lf7, true);
Arc a4 = new Arc(new Point3d(0, 0, 0), D / 2, Math.PI, Math.PI*3/2);
a4.TransformBy(Matrix3d.Displacement(vec));
Entity[] l8a4 = new Entity[] { l8, a4 };
LoftedSurface lf8 = new LoftedSurface();
lf8.CreateLoftedSurface(l8a4, null, null, lo);
btr.AppendEntity(lf8);
trans.AddNewlyCreatedDBObject(lf8, true);
}
}
}
}
}
trans.Commit();
}
}
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