/// <summary> 将任意实体转换为网格 </summary>
public static void CreateMeshFromSolid()
{
//Select a solid.
Editor ed = Application.DocumentManager.MdiActiveDocument.Editor;
PromptEntityOptions opts = new PromptEntityOptions("\r\n" + "Select Solid:");
opts.SetRejectMessage("\r\n" + "That\'s not a solid!");
opts.AddAllowedClass(typeof(Solid3d), false);
PromptEntityResult res = ed.GetEntity(opts);
//Exit sub if user cancelled selection.
if (res.Status != PromptStatus.OK)
{
return;
}
//Usual transaction stuff
Database db = Application.DocumentManager.MdiActiveDocument.Database;
using (Transaction tr = db.TransactionManager.StartTransaction())
{
Solid3d mySolid = tr.GetObject(res.ObjectId, OpenMode.ForRead, false) as Solid3d;
Extents3d ext = mySolid.Bounds.Value;
Vector3d vec = ext.MaxPoint - ext.MinPoint;
// 实体转换为网格的生成算法，即平滑或插值的参数
//Define params governing mesh generation algorithm(See ObjectARX helpfiles for explanation of params you may need to change them depending on the scale of the solid)
MeshFaceterData myFaceterData = new MeshFaceterData(0.01 * vec.Length, 40 * Math.PI / 180, 2, 2, 15, 5, 5, 0);
//Create new mesh from solid (smoothing level 1)
MeshDataCollection meshData = SubDMesh.GetObjectMesh(mySolid, myFaceterData);
SubDMesh myMesh = new SubDMesh();
myMesh.SetSubDMesh(meshData.VertexArray, meshData.FaceArray, 1);
//Add mesh to database. (Don't remove solid).
myMesh.SetDatabaseDefaults();
var btr = tr.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
btr.AppendEntity(myMesh);
tr.AddNewlyCreatedDBObject(myMesh, true);
//Our work here is done
tr.Commit();
}
}
internal static List <MeshData> SolidInfoForCollection(Document doc, Point3d camPos, ObjectIdCollection ids)
{
var sols = new List <MeshData>();
using (var tr = doc.TransactionManager.StartOpenCloseTransaction())
{
foreach (ObjectId id in ids)
{
Entity ent = tr.GetObject(id, OpenMode.ForRead) as Entity;
// Entity handle to name the Three.js objects
String hand = ent.Handle.ToString();
Autodesk.AutoCAD.Colors.EntityColor clr = ent.EntityColor;
// Entity color to use for the Three.js objects
long b, g, r;
if (ent.ColorIndex < 256)
{
System.Byte byt = System.Convert.ToByte(ent.ColorIndex);
int rgb = Autodesk.AutoCAD.Colors.EntityColor.LookUpRgb(byt);
b = (rgb & 0xffL);
g = (rgb & 0xff00L) >> 8;
r = rgb >> 16;
}
else
{
b = 127;
g = 127;
r = 127;
}
String entColor = "0x" + String.Format("{0:X2}{1:X2}{2:X2}", r, g, b);
// Entity extents
Extents3d ext = ent.GeometricExtents;
var tmp = ext.MinPoint + 0.5 * (ext.MaxPoint - ext.MinPoint);
Vector3d dir = ext.MaxPoint - ext.MinPoint;
var mid = new Point3d(ext.MinPoint.X, tmp.Y, tmp.Z);
var dist = camPos.DistanceTo(mid);
if (id.ObjectClass.Name.Equals("AcDbSubDMesh"))
{
// Already a Mesh. Get the face info and clean it up
// a bit to export it as a THREE.Face3 which only has three vertices
var mesh = ent as SubDMesh;
Point3dCollection threeVertices = new Point3dCollection();
Autodesk.AutoCAD.Geometry.Int32Collection threeFaceInfo = new Autodesk.AutoCAD.Geometry.Int32Collection();
Point3dCollection vertices = mesh.Vertices;
int[] faceArr = mesh.FaceArray.ToArray();
int[] edgeArr = mesh.EdgeArray.ToArray();
Autodesk.AutoCAD.Geometry.Int32Collection faceVertices = new Autodesk.AutoCAD.Geometry.Int32Collection();
int verticesInFace = 0;
int facecnt = 0;
for (int x = 0; x < faceArr.Length; facecnt++, x = x + verticesInFace + 1)
{
faceVertices.Clear();
verticesInFace = faceArr[x];
for (int y = x + 1; y <= x + verticesInFace; y++)
{
faceVertices.Add(faceArr[y]);
}
// Merging of mesh faces can result in faces with multiple vertices
// A simple collinearity check can help remove those redundant vertices
bool continueCollinearCheck = false;
do
{
continueCollinearCheck = false;
for (int index = 0; index < faceVertices.Count; index++)
{
int v1 = index;
int v2 = (index + 1) >= faceVertices.Count ? (index + 1) - faceVertices.Count : index + 1;
int v3 = (index + 2) >= faceVertices.Count ? (index + 2) - faceVertices.Count : index + 2;
// Check collinear
Point3d p1 = vertices[faceVertices[v1]];
Point3d p2 = vertices[faceVertices[v2]];
Point3d p3 = vertices[faceVertices[v3]];
Vector3d vec1 = p1 - p2;
Vector3d vec2 = p2 - p3;
if (vec1.IsCodirectionalTo(vec2))
{
faceVertices.RemoveAt(v2);
continueCollinearCheck = true;
break;
}
}
} while (continueCollinearCheck);
if (faceVertices.Count == 3)
{
Point3d p1 = vertices[faceVertices[0]];
Point3d p2 = vertices[faceVertices[1]];
Point3d p3 = vertices[faceVertices[2]];
if (!threeVertices.Contains(p1))
{
threeVertices.Add(p1);
}
threeFaceInfo.Add(threeVertices.IndexOf(p1));
if (!threeVertices.Contains(p2))
{
threeVertices.Add(p2);
}
threeFaceInfo.Add(threeVertices.IndexOf(p2));
if (!threeVertices.Contains(p3))
{
threeVertices.Add(p3);
}
threeFaceInfo.Add(threeVertices.IndexOf(p3));
}
else if (faceVertices.Count == 4)
{ // A face with 4 vertices, lets split it to
// make it easier later to create a THREE.Face3
Point3d p1 = vertices[faceVertices[0]];
Point3d p2 = vertices[faceVertices[1]];
Point3d p3 = vertices[faceVertices[2]];
if (!threeVertices.Contains(p1))
{
threeVertices.Add(p1);
}
threeFaceInfo.Add(threeVertices.IndexOf(p1));
if (!threeVertices.Contains(p2))
{
threeVertices.Add(p2);
}
threeFaceInfo.Add(threeVertices.IndexOf(p2));
if (!threeVertices.Contains(p3))
{
threeVertices.Add(p3);
}
threeFaceInfo.Add(threeVertices.IndexOf(p3));
p1 = vertices[faceVertices[2]];
p2 = vertices[faceVertices[3]];
p3 = vertices[faceVertices[0]];
if (!threeVertices.Contains(p1))
{
threeVertices.Add(p1);
}
threeFaceInfo.Add(threeVertices.IndexOf(p1));
if (!threeVertices.Contains(p2))
{
threeVertices.Add(p2);
}
threeFaceInfo.Add(threeVertices.IndexOf(p2));
if (!threeVertices.Contains(p3))
{
threeVertices.Add(p3);
}
threeFaceInfo.Add(threeVertices.IndexOf(p3));
}
else
{
Application.DocumentManager.MdiActiveDocument.Editor.WriteMessage("Face with more than 4 vertices will need triangulation to import in Three.js ");
}
}
sols.Add(new MeshData(dist, hand, ext, threeVertices, threeFaceInfo, entColor));
}
else if (id.ObjectClass.Name.Equals("AcDb3dSolid"))
{
// Mesh the solid to export to Three.js
Autodesk.AutoCAD.DatabaseServices.Solid3d sld = tr.GetObject(id, OpenMode.ForRead) as Autodesk.AutoCAD.DatabaseServices.Solid3d;
MeshFaceterData mfd = new MeshFaceterData();
// Only triangles
mfd.FaceterMeshType = 2;
// May need change based on how granular we want the mesh to be.
mfd.FaceterMaxEdgeLength = dir.Length * 0.025;
MeshDataCollection md = SubDMesh.GetObjectMesh(sld, mfd);
Point3dCollection threeVertices = new Point3dCollection();
Autodesk.AutoCAD.Geometry.Int32Collection threeFaceInfo = new Autodesk.AutoCAD.Geometry.Int32Collection();
Point3dCollection vertices = md.VertexArray;
int[] faceArr = md.FaceArray.ToArray();
Autodesk.AutoCAD.Geometry.Int32Collection faceVertices = new Autodesk.AutoCAD.Geometry.Int32Collection();
int verticesInFace = 0;
int facecnt = 0;
for (int x = 0; x < faceArr.Length; facecnt++, x = x + verticesInFace + 1)
{
faceVertices.Clear();
verticesInFace = faceArr[x];
for (int y = x + 1; y <= x + verticesInFace; y++)
{
faceVertices.Add(faceArr[y]);
}
if (faceVertices.Count == 3)
{
Point3d p1 = vertices[faceVertices[0]];
Point3d p2 = vertices[faceVertices[1]];
Point3d p3 = vertices[faceVertices[2]];
if (!threeVertices.Contains(p1))
{
threeVertices.Add(p1);
}
threeFaceInfo.Add(threeVertices.IndexOf(p1));
if (!threeVertices.Contains(p2))
{
threeVertices.Add(p2);
}
threeFaceInfo.Add(threeVertices.IndexOf(p2));
if (!threeVertices.Contains(p3))
{
threeVertices.Add(p3);
}
threeFaceInfo.Add(threeVertices.IndexOf(p3));
}
}
sols.Add(new MeshData(dist, hand, ext, threeVertices, threeFaceInfo, entColor));
tr.Commit();
}
}
}
return(sols);
}
static public void MeshFromSolid()
{
Utils.Utils.Init();
Document acDoc = acApp.DocumentManager.MdiActiveDocument;
Database acCurDb = acDoc.Database;
Editor ed = acDoc.Editor;
while (true)
{
// Ask the user to select a solid
PromptEntityOptions peo = new PromptEntityOptions("Select a 3D solid");
peo.SetRejectMessage("\nA 3D solid must be selected.");
peo.AddAllowedClass(typeof(Solid3d), true);
PromptEntityResult per = ed.GetEntity(peo);
if (per.Status == PromptStatus.Cancel || per.Status == PromptStatus.Error)
{
Utils.Utils.End(); return;
}
using (Transaction acTrans = acCurDb.TransactionManager.StartTransaction())
{
// Open the Block table for read
BlockTable acBlkTbl;
acBlkTbl = acTrans.GetObject(acCurDb.BlockTableId, OpenMode.ForRead) as BlockTable;
// Open the Block table record Model space for write
BlockTableRecord acBlkTblRec;
acBlkTblRec = acTrans.GetObject(acBlkTbl[BlockTableRecord.ModelSpace], OpenMode.ForWrite) as BlockTableRecord;
Solid3d sol = acTrans.GetObject(per.ObjectId, OpenMode.ForWrite) as Solid3d;
try
{
// Set mesh/faces properties
MeshFaceterData mfd = new MeshFaceterData();
mfd.FaceterMeshType = 2;
mfd.FaceterDevNormal = 40;
mfd.FaceterDevSurface = 0.05;
mfd.FaceterGridRatio = 0;
mfd.FaceterMaxEdgeLength = 0;
MeshDataCollection md = SubDMesh.GetObjectMesh(sol, mfd);
// Create mesh
SubDMesh mesh = new SubDMesh();
mesh.SetDatabaseDefaults();
mesh.SetSubDMesh(md.VertexArray, md.FaceArray, 0);
mesh.Layer = sol.Layer;
// Add mesh to DB
acBlkTblRec.AppendEntity(mesh);
acTrans.AddNewlyCreatedDBObject(mesh, true);
// Delete solid object
sol.Erase(true);
acTrans.Commit();
}
catch (System.Exception ex)
{
ed.WriteMessage("Exception: {0}", ex.Message);
}
}
}
}
