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[occt.git] / src / IVtkOCC / IVtkOCC_ShapeMesher.cxx
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913a4c4a 1// Created on: 2011-10-14
2// Created by: Roman KOZLOV
3// Copyright (c) 2011-2014 OPEN CASCADE SAS
4//
5// This file is part of Open CASCADE Technology software library.
6//
7// This library is free software; you can redistribute it and/or modify it under
8// the terms of the GNU Lesser General Public License version 2.1 as published
9// by the Free Software Foundation, with special exception defined in the file
10// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
11// distribution for complete text of the license and disclaimer of any warranty.
12//
13// Alternatively, this file may be used under the terms of Open CASCADE
14// commercial license or contractual agreement.
15
16#include <Adaptor3d_HCurve.hxx>
17#include <Adaptor3d_IsoCurve.hxx>
18#include <Bnd_Box.hxx>
19#include <BRep_Tool.hxx>
20#include <BRepMesh_IncrementalMesh.hxx>
21#include <BRepBndLib.hxx>
22#include <BRepMesh_DiscretFactory.hxx>
23#include <BRepMesh_DiscretRoot.hxx>
913a4c4a 24#include <BRepTools.hxx>
25#include <Hatch_Hatcher.hxx>
26#include <GCPnts_QuasiUniformDeflection.hxx>
27#include <GCPnts_TangentialDeflection.hxx>
c04c30b3 28#include <Geom_BezierSurface.hxx>
29#include <Geom_BSplineSurface.hxx>
913a4c4a 30#include <Geom2dAdaptor_Curve.hxx>
31#include <GeomAdaptor_Curve.hxx>
32#include <gp_Dir2d.hxx>
33#include <gp_Pnt2d.hxx>
34#include <IVtkOCC_ShapeMesher.hxx>
35#include <NCollection_Array1.hxx>
36#include <Poly_Polygon3D.hxx>
37#include <Poly_PolygonOnTriangulation.hxx>
38#include <Poly_Triangulation.hxx>
39#include <Precision.hxx>
40#include <Prs3d.hxx>
41#include <Prs3d_Drawer.hxx>
42#include <Quantity_Length.hxx>
43#include <Standard_ErrorHandler.hxx>
44#include <TColgp_SequenceOfPnt2d.hxx>
45#include <TColStd_Array1OfReal.hxx>
46#include <TopExp.hxx>
47#include <TopExp_Explorer.hxx>
48
92efcf78 49IMPLEMENT_STANDARD_RTTIEXT(IVtkOCC_ShapeMesher,IVtk_IShapeMesher)
50
913a4c4a 51// Handle implementation
ec357c5c 52
913a4c4a 53
54//================================================================
55// Function : internalBuild
56// Purpose :
57//================================================================
58void IVtkOCC_ShapeMesher::internalBuild()
59{
60 // TODO: do we need any protection here so as not to triangualte
61 // the shape twice??? This can be done e.g. by checking if
62 // triangulation exists for TopoDS_Shape..
63 meshShape();
64
65 // Free vertices and free edges should always be shown.
66 // Shared edges are needed in WF representation only.
67 // TODO: how to filter free edges at visualization level????
68 addFreeVertices();
69 addEdges();
70
71 // Build wireframe points and cells (lines for isolines)
72 addWireFrameFaces();
73
74 // Build shaded representation (based on Poly_Triangulation)
75 addShadedFaces();
76}
77
78//================================================================
79// Function : GetShapeObj
80// Purpose :
81//================================================================
82const IVtkOCC_Shape::Handle IVtkOCC_ShapeMesher::GetShapeObj() const
83{
84 return (IVtkOCC_Shape::Handle::DownCast(myShapeObj));
85}
86
87//================================================================
88// Function : GetDeflection
89// Purpose : Returns absolute deflection used by this algorithm.
90//================================================================
91Standard_Real IVtkOCC_ShapeMesher::GetDeflection() const
92{
93 if (myDeflection < Precision::Confusion()) // if not yet initialized
94 {
95 Handle(Prs3d_Drawer) aDefDrawer = new Prs3d_Drawer();
96 aDefDrawer->SetTypeOfDeflection (Aspect_TOD_RELATIVE);
97 aDefDrawer->SetDeviationCoefficient (GetDeviationCoeff());
98 myDeflection = Prs3d::GetDeflection (GetShapeObj()->GetShape(), aDefDrawer);
99 }
100
101 return myDeflection;
102}
103
104//================================================================
105// Function : meshShape
106// Purpose :
107//================================================================
108void IVtkOCC_ShapeMesher::meshShape()
109{
110 TopoDS_Shape anOcctShape = GetShapeObj()->GetShape();
111 if (anOcctShape.IsNull())
112 {
113 return;
114 }
115
116 //Clean triangulation before compute incremental mesh
117 BRepTools::Clean (anOcctShape);
118
119 //Compute triangulation
120 Standard_Real aDeflection = GetDeflection();
121 if (aDeflection < Precision::Confusion())
122 {
123 return;
124 }
125
126 try
127 {
128 OCC_CATCH_SIGNALS
129
130 Handle(BRepMesh_DiscretRoot) anAlgo;
131 anAlgo = BRepMesh_DiscretFactory::Get().Discret (anOcctShape,
132 aDeflection,
133 GetDeviationAngle());
134 if (!anAlgo.IsNull())
135 {
136 anAlgo->Perform();
137 }
138 }
139 catch (Standard_Failure)
140 { }
141}
142
143//================================================================
144// Function : addFreeVertices
145// Purpose :
146//================================================================
147void IVtkOCC_ShapeMesher::addFreeVertices()
148{
149 TopTools_IndexedDataMapOfShapeListOfShape aVertexMap;
150 TopExp::MapShapesAndAncestors (GetShapeObj()->GetShape(),
151 TopAbs_VERTEX,
152 TopAbs_EDGE,
153 aVertexMap);
154
155 Standard_Integer aVertNum = aVertexMap.Extent();
156 IVtk_MeshType aType;
157 for (Standard_Integer anIt = 1; anIt <= aVertNum; anIt++)
158 {
159 if (aVertexMap.FindFromIndex(anIt).IsEmpty())
160 {
161 aType = MT_FreeVertex;
162 }
163 else
164 {
165 aType = MT_SharedVertex;
166 }
167 TopoDS_Vertex aVertex = TopoDS::Vertex (aVertexMap.FindKey (anIt));
168 addVertex (aVertex, GetShapeObj()->GetSubShapeId (aVertex), aType);
169 }
170}
171
172//================================================================
173// Function : addEdges
174// Purpose :
175//================================================================
176void IVtkOCC_ShapeMesher::addEdges()
177{
178 TopTools_IndexedDataMapOfShapeListOfShape anEdgesMap;
179 TopExp::MapShapesAndAncestors (GetShapeObj()->GetShape(),
180 TopAbs_EDGE,
181 TopAbs_FACE,
182 anEdgesMap);
183
184 int aNbFaces;
185 IVtk_MeshType aType;
186 myEdgesTypes.Clear();
187
188 TopExp_Explorer anEdgeIter (GetShapeObj()->GetShape(), TopAbs_EDGE);
189 for (; anEdgeIter.More(); anEdgeIter.Next())
190 {
191 TopoDS_Edge anOcctEdge = TopoDS::Edge (anEdgeIter.Current());
192 aNbFaces = anEdgesMap.FindFromKey (anOcctEdge).Extent();
193 if (aNbFaces == 0)
194 {
195 aType = MT_FreeEdge;
196 }
197 else if (aNbFaces == 1)
198 {
199 aType = MT_BoundaryEdge;
200 }
201 else
202 {
203 aType = MT_SharedEdge;
204 }
205 addEdge (anOcctEdge, GetShapeObj()->GetSubShapeId (anOcctEdge), aType);
206 myEdgesTypes.Bind (anOcctEdge, aType);
207 }
208}
209
210//================================================================
211// Function : addWireFrameFaces
212// Purpose :
213//================================================================
214void IVtkOCC_ShapeMesher::addWireFrameFaces()
215{
216 // Check the deflection value once for all faces
217 if (GetDeflection() < Precision::Confusion())
218 {
219 return;
220 }
221
222 TopExp_Explorer aFaceIter (GetShapeObj()->GetShape(), TopAbs_FACE);
223 for (; aFaceIter.More(); aFaceIter.Next())
224 {
225 TopoDS_Face anOcctFace = TopoDS::Face (aFaceIter.Current());
226 try
227 {
228 OCC_CATCH_SIGNALS
229 addWFFace (anOcctFace,
230 GetShapeObj()->GetSubShapeId (anOcctFace));
231 }
232 catch (Standard_Failure)
233 { }
234 }
235}
236
237//================================================================
238// Function : addShadedFaces
239// Purpose :
240//================================================================
241void IVtkOCC_ShapeMesher::addShadedFaces()
242{
243 TopExp_Explorer aFaceIter (GetShapeObj()->GetShape(), TopAbs_FACE);
244 for (; aFaceIter.More(); aFaceIter.Next())
245 {
246 TopoDS_Face anOcctFace = TopoDS::Face (aFaceIter.Current());
247 addShadedFace (anOcctFace,
248 GetShapeObj()->GetSubShapeId (anOcctFace));
249 }
250}
251
252//================================================================
253// Function : addVertex
254// Purpose :
255//================================================================
256void IVtkOCC_ShapeMesher::addVertex (const TopoDS_Vertex& theVertex,
257 const IVtk_IdType theShapeId,
258 const IVtk_MeshType theMeshType)
259{
260 if (theVertex.IsNull())
261 {
262 return;
263 }
264
265 gp_Pnt aPnt3d = BRep_Tool::Pnt (theVertex);
266
267 IVtk_PointId anId =
268 myShapeData->InsertCoordinate (aPnt3d.X(), aPnt3d.Y(), aPnt3d.Z());
269 myShapeData->InsertVertex (theShapeId, anId, theMeshType);
270
271}
272
273//================================================================
274// Function : processPolyline
275// Purpose :
276//================================================================
277void IVtkOCC_ShapeMesher::processPolyline (Standard_Integer theNbNodes,
278 const TColgp_Array1OfPnt& thePoints,
279 const TColStd_Array1OfInteger& thePointIds,
280 const IVtk_IdType theOcctId,
281 bool theNoTransform,
282 gp_Trsf theTransformation,
283 const IVtk_MeshType theMeshType)
284{
285 if (theNbNodes < 2)
286 {
287 return;
288 }
289
290 IVtk_PointIdList *aPolyPointIds = new IVtk_PointIdList();
291
292 IVtk_PointId anId;
293 for (Standard_Integer aJ = 0; aJ < theNbNodes; aJ++)
294 {
295 Standard_Integer aPntId = thePointIds (aJ + 1);
296 gp_Pnt point = thePoints (aPntId);
297
298 if (!theNoTransform)
299 {
300 // Apply the transformation to points
301 point.Transform (theTransformation);
302 }
303
304 anId = myShapeData->InsertCoordinate (point.X(), point.Y(), point.Z());
305 aPolyPointIds->Append (anId);
306 }
307
308 myShapeData->InsertLine (theOcctId, aPolyPointIds, theMeshType);
309
310 delete aPolyPointIds;
311}
312
313//================================================================
314// Function : addEdge
315// Purpose :
316//================================================================
317void IVtkOCC_ShapeMesher::addEdge (const TopoDS_Edge& theEdge,
318 const IVtk_IdType theShapeId,
319 const IVtk_MeshType theMeshType)
320{
321 if (theEdge.IsNull() || BRep_Tool::Degenerated (theEdge))
322 {
323 return;
324 }
325
326 // Two discrete representations of an OCCT edge are possible:
327 // 1. Polygon on trinagulation - holds Ids of points
328 // contained in Poly_Triangulation object
329 Handle(Poly_PolygonOnTriangulation) aPolyOnTriangulation;
330 Handle(Poly_Triangulation) aTriangulation;
331 TopLoc_Location aLocation;
332 BRep_Tool::PolygonOnTriangulation (theEdge,
333 aPolyOnTriangulation,
334 aTriangulation,
335 aLocation,
336 1);
337
338 // 2. 3D polygon - holds 3D points
339 Handle(Poly_Polygon3D) aPoly3d;
340 if (aPolyOnTriangulation.IsNull())
341 {
342 aPoly3d = BRep_Tool::Polygon3D (theEdge, aLocation);
343 }
344
345 if (aPoly3d.IsNull() && aPolyOnTriangulation.IsNull())
346 {
347 return;
348 }
349
350 // Handle a non-identity transofmation applied to the edge
351 gp_Trsf anEdgeTransf;
352 bool noTransform = true;
353 if (!aLocation.IsIdentity())
354 {
355 noTransform = false;
356 anEdgeTransf = aLocation.Transformation();
357 }
358
359 if (!aPoly3d.IsNull())
360 {
361 Standard_Integer aNbNodes = aPoly3d->NbNodes();
362 const TColgp_Array1OfPnt& aPoints = aPoly3d->Nodes();
363 TColStd_Array1OfInteger aPointIds (1, aNbNodes);
364
365 for (Standard_Integer anI = 1; anI <= aNbNodes; anI++)
366 {
367 aPointIds.SetValue (anI, anI);
368 }
369
370 processPolyline (aNbNodes,
371 aPoints,
372 aPointIds,
373 theShapeId,
374 noTransform,
375 anEdgeTransf,
376 theMeshType);
377 }
378 else
379 {
380 Standard_Integer aNbNodes = aPolyOnTriangulation->NbNodes();
381 const TColStd_Array1OfInteger& aPointIds = aPolyOnTriangulation->Nodes();
382 const TColgp_Array1OfPnt& aPoints = aTriangulation->Nodes();
383
384 processPolyline (aNbNodes,
385 aPoints,
386 aPointIds,
387 theShapeId,
388 noTransform,
389 anEdgeTransf,
390 theMeshType);
391 }
392}
393
394
395//================================================================
396// Function : FindLimits
397// Purpose : Static internal function, finds parametrical limits of the curve.
398//! @param [in] theCurve 3D curve adaptor used to retrieve the curve geometry
399//! @param [in] theLimit maximum allowed absolute parameter value
400//! @param [out] theFirst minimum parameter value for the curve
401//! @param [out] theLast maximum parameter value for the curve
402//================================================================
403static void FindLimits (const Adaptor3d_Curve& theCurve,
404 const Standard_Real& theLimit,
405 Standard_Real& theFirst,
406 Standard_Real& theLast)
407{
408 theFirst = Max(theCurve.FirstParameter(), theFirst);
409 theLast = Min(theCurve.LastParameter(), theLast);
410 Standard_Boolean isFirstInf = Precision::IsNegativeInfinite (theFirst);
411 Standard_Boolean isLastInf = Precision::IsPositiveInfinite (theLast);
412
413 if (isFirstInf || isLastInf)
414 {
415 gp_Pnt aP1, aP2;
416 Standard_Real aDelta = 1;
417 if (isFirstInf && isLastInf)
418 {
419 do
420 {
421 aDelta *= 2;
422 theFirst = - aDelta;
423 theLast = aDelta;
424 theCurve.D0 (theFirst, aP1);
425 theCurve.D0 (theLast, aP2);
426 } while (aP1.Distance (aP2) < theLimit);
427 }
428 else if (isFirstInf)
429 {
430 theCurve.D0 (theLast, aP2);
431 do {
432 aDelta *= 2;
433 theFirst = theLast - aDelta;
434 theCurve.D0 (theFirst, aP1);
435 } while (aP1.Distance(aP2) < theLimit);
436 }
437 else if (isLastInf)
438 {
439 theCurve.D0 (theFirst, aP1);
440 do
441 {
442 aDelta *= 2;
443 theLast = theFirst + aDelta;
444 theCurve.D0 (theLast, aP2);
445 } while (aP1.Distance (aP2) < theLimit);
446 }
447 }
448}
449
450//================================================================
451// Function : FindLimits
452// Purpose :Static helper function, builds a discrete representation
453//! (sequence of points) for the given curve.
454//!
455//! @param [in] theCurve 3D curve adaptor used to retrieve the curve geometry
456//! @param [in] theDeflection absolute deflection value
457//! @param [in] theAngle deviation angle value
458//! @param [in] theU1 minimal curve parameter value
459//! @param [in] theU2 maximal curve parameter value
460//! @param [out] thePoints the container for generated polyline
461//================================================================
462static void DrawCurve (Adaptor3d_Curve& theCurve,
463 const Quantity_Length theDeflection,
464 const Standard_Real theAngle,
465 const Standard_Real theU1,
466 const Standard_Real theU2,
467 IVtk_Polyline& thePoints)
468{
469 switch (theCurve.GetType())
470 {
471 case GeomAbs_Line:
472 {
473 gp_Pnt aPnt = theCurve.Value(theU1);
474 thePoints.Append (aPnt);
475
476 aPnt = theCurve.Value(0.5 * (theU1 + theU2));
477 thePoints.Append (aPnt);
478
479 aPnt = theCurve.Value (theU2);
480 thePoints.Append(aPnt);
481 }
482 break;
483 default:
484 {
485 Standard_Integer aNbInter = theCurve.NbIntervals(GeomAbs_C1);
486 Standard_Integer anI, aJ;
487 TColStd_Array1OfReal aParams(1, aNbInter+1);
488 theCurve.Intervals(aParams, GeomAbs_C1);
464cd2fb 489 Standard_Real anU1, anU2;
913a4c4a 490 Standard_Integer NumberOfPoints;
491
492 for (aJ = 1; aJ <= aNbInter; aJ++)
493 {
464cd2fb 494 anU1 = aParams (aJ); anU2 = aParams (aJ + 1);
495 if (anU2 > anU1 && anU1 < anU2)
913a4c4a 496 {
464cd2fb 497 anU1 = Max(anU1, anU1);
498 anU2 = Min(anU2, anU2);
913a4c4a 499
464cd2fb 500 GCPnts_TangentialDeflection anAlgo (theCurve, anU1, anU2, theAngle, theDeflection);
913a4c4a 501 NumberOfPoints = anAlgo.NbPoints();
502
503 if (NumberOfPoints > 0)
504 {
505 for (anI = 1; anI < NumberOfPoints; anI++)
506 {
507 thePoints.Append(anAlgo.Value (anI));
508 }
509 if (aJ == aNbInter)
510 {
511 thePoints.Append (anAlgo.Value (NumberOfPoints));
512 }
513 }
514 }
515 }
516 }
517 }
518}
519
520//================================================================
521// Function : buildIsoLines
522// Purpose :
523//================================================================
524void IVtkOCC_ShapeMesher::buildIsoLines (const Handle(BRepAdaptor_HSurface)& theFace,
525 const Standard_Boolean theIsDrawUIso,
526 const Standard_Boolean theIsDrawVIso,
527 const Standard_Integer theNBUiso,
528 const Standard_Integer theNBViso,
529 IVtk_PolylineList& thePolylines)
530{
531 Standard_Real anUF, anUL, aVF, aVL;
532 anUF = theFace->FirstUParameter();
533 anUL = theFace->LastUParameter();
534 aVF = theFace->FirstVParameter();
535 aVL = theFace->LastVParameter();
536
537 // Restrict maximal parameter value
538 // in OCCT it's 5e+5 by default
539 const Standard_Real aLimit = 5e+5;
540
541 // compute bounds of the restriction
542 Standard_Real anUMin, anUMax, aVMin, aVMax;
543 Standard_Integer anI;
544
545 anUMin = Max (anUF, -aLimit);
546 anUMax = Min (anUL, aLimit);
547 aVMin = Max (aVF, -aLimit);
548 aVMax = Min (aVL, aLimit);
549
550 // update min max for the hatcher.
551 gp_Pnt2d aP1,aP2;
552 gp_Pnt aDummyPnt;
553
554 Standard_Real aDdefle = Max (anUMax - anUMin, aVMax - aVMin) * GetDeviationCoeff();
555 TColgp_SequenceOfPnt2d aTabPoints;
556
557 anUMin = aVMin = 1.e100;
558 anUMax = aVMax = -1.e100;
559
560 // Process the edges
561 TopExp_Explorer aToolRst;
562 TopoDS_Face aTopoFace (((BRepAdaptor_Surface*)&(theFace->Surface()))->Face());
563 for (aToolRst.Init (aTopoFace, TopAbs_EDGE); aToolRst.More(); aToolRst.Next())
564 {
565 TopAbs_Orientation anOrient = aToolRst.Current().Orientation();
566 // Skip INTERNAL and EXTERNAL edges
567 if (anOrient == TopAbs_FORWARD || anOrient == TopAbs_REVERSED)
568 {
569 Standard_Real anU1, anU2;
570 const Handle(Geom2d_Curve)& aCurve =
571 BRep_Tool::CurveOnSurface (TopoDS::Edge (aToolRst.Current()),
572 aTopoFace,
573 anU1, anU2);
574 if (aCurve.IsNull())
575 {
576 continue;
577 }
578
579 Geom2dAdaptor_Curve aRCurve;
580 aRCurve.Load (aCurve, anU1, anU2);
581 if (aRCurve.GetType() != GeomAbs_Line)
582 {
583 GCPnts_QuasiUniformDeflection aUDP(aRCurve, aDdefle);
584 if (aUDP.IsDone())
585 {
586 Standard_Integer NumberOfPoints = aUDP.NbPoints();
587 if ( NumberOfPoints >= 2 )
588 {
589 aDummyPnt = aUDP.Value (1);
590 aP2.SetCoord (aDummyPnt.X(), aDummyPnt.Y());
591 anUMin = Min (aP2.X(), anUMin);
592 anUMax = Max (aP2.X(), anUMax);
593 aVMin = Min (aP2.Y(), aVMin);
594 aVMax = Max (aP2.Y(), aVMax);
595 for (anI = 2; anI <= NumberOfPoints; anI++)
596 {
597 aP1 = aP2;
598 aDummyPnt = aUDP.Value (anI);
599 aP2.SetCoord (aDummyPnt.X(), aDummyPnt.Y());
600 anUMin = Min(aP2.X(), anUMin);
601 anUMax = Max(aP2.X(), anUMax);
602 aVMin = Min(aP2.Y(), aVMin);
603 aVMax = Max(aP2.Y(), aVMax);
604
605 if(anOrient == TopAbs_FORWARD )
606 {
607 //isobuild.Trim(P1,P2);
608 aTabPoints.Append (aP1);
609 aTabPoints.Append (aP2);
610 }
611 else
612 {
613 //isobuild.Trim(P2,P1);
614 aTabPoints.Append (aP2);
615 aTabPoints.Append (aP1);
616 }
617 }
618 }
619 }
620 else
621 {
622 cout << "Cannot evaluate curve on surface"<<endl;
623 }
624 }
625 else
626 {
627 anU1 = aRCurve.FirstParameter();
628 anU2 = aRCurve.LastParameter();
629 // MSV 17.08.06 OCC13144: U2 occured less than U1, to overcome it
630 // ensure that distance U2-U1 is not greater than aLimit*2,
631 // if greater then choose an origin and use aLimit to define
632 // U1 and U2 anew
633 Standard_Real aOrigin = 0.;
634 if (!Precision::IsNegativeInfinite(anU1) || !Precision::IsPositiveInfinite (anU2))
635 {
636 if (Precision::IsNegativeInfinite (anU1))
637 {
638 aOrigin = anU2 - aLimit;
639 }
640 else if (Precision::IsPositiveInfinite (anU2))
641 {
642 aOrigin = anU1 + aLimit;
643 }
644 else
645 {
646 aOrigin = (anU1 + anU2) * 0.5;
647 }
648 }
649
650 anU1 = Max (aOrigin - aLimit, anU1);
651 anU2 = Min (aOrigin + aLimit, anU2);
652 aP1 = aRCurve.Value (anU1);
653 aP2 = aRCurve.Value (anU2);
654 anUMin = Min(aP1.X(), anUMin);
655 anUMax = Max(aP1.X(), anUMax);
656 aVMin = Min(aP1.Y(), aVMin);
657 aVMax = Max(aP1.Y(), aVMax);
658 anUMin = Min(aP2.X(), anUMin);
659 anUMax = Max(aP2.X(), anUMax);
660 aVMin = Min(aP2.Y(), aVMin);
661 aVMax = Max(aP2.Y(), aVMax);
662 if(anOrient == TopAbs_FORWARD )
663 {
664 // isobuild.Trim(P1,P2);
665 aTabPoints.Append (aP1);
666 aTabPoints.Append (aP2);
667 }
668 else
669 {
670 //isobuild.Trim(P2,P1);
671 aTabPoints.Append (aP2);
672 aTabPoints.Append (aP1);
673 }
674 }
675 }
676 }
677
678 // load the isos
679 const Standard_Real anIntersectionTolerance = 1.e-5;
680 Hatch_Hatcher anIsoBuild (anIntersectionTolerance, Standard_True );
681
682 Standard_Boolean isUClosed = theFace->IsUClosed();
683 Standard_Boolean isVClosed = theFace->IsVClosed();
684
685 if (!isUClosed)
686 {
687 anUMin = anUMin + (anUMax - anUMin) / 1000.0;
688 anUMax = anUMax - (anUMax - anUMin) /1000.0;
689 }
690
691 if (!isVClosed)
692 {
693 aVMin = aVMin + (aVMax - aVMin) /1000.0;
694 aVMax = aVMax - (aVMax - aVMin) /1000.0;
695 }
696
697 if (theIsDrawUIso)
698 {
699 if (theNBUiso > 0)
700 {
701 isUClosed = Standard_False;
702 Standard_Real aDu= isUClosed ? (anUMax - anUMin) / theNBUiso : (anUMax - anUMin) / (1 + theNBUiso);
703 for (anI = 1; anI <= theNBUiso; anI++)
704 {
705 anIsoBuild.AddXLine (anUMin + aDu*anI);
706 }
707 }
708 }
709 if (theIsDrawVIso)
710 {
711 if (theNBViso > 0)
712 {
713 isVClosed = Standard_False;
714 Standard_Real aDv= isVClosed ? (aVMax - aVMin) / theNBViso : (aVMax - aVMin) / (1 + theNBViso);
715 for (anI = 1; anI <= theNBViso; anI++)
716 {
717 anIsoBuild.AddYLine (aVMin + aDv*anI);
718 }
719 }
720 }
721
722 Standard_Integer aLength = aTabPoints.Length();
723 for (anI = 1; anI <= aLength; anI += 2)
724 {
725 anIsoBuild.Trim (aTabPoints (anI),aTabPoints (anI + 1));
726 }
727
728 // Create the polylines for isos
729 Adaptor3d_IsoCurve anIso;
730 anIso.Load(theFace);
731 Handle(Geom_Curve) aBCurve;
732 const BRepAdaptor_Surface& aBSurf = *(BRepAdaptor_Surface*)&(theFace->Surface());
733 GeomAbs_SurfaceType aType = theFace->GetType();
734
735 Standard_Integer aNumberOfLines = anIsoBuild.NbLines();
736 Handle(Geom_Surface) aGeomSurf;
737 if (aType == GeomAbs_BezierSurface)
738 {
739 aGeomSurf = aBSurf.Bezier();
740 }
741 else if (aType == GeomAbs_BSplineSurface)
742 {
743 aGeomSurf = aBSurf.BSpline();
744 }
745
746 Standard_Real aDeflection = GetDeflection();
747 Standard_Real anAngle = GetDeviationAngle();
748 for (anI = 1; anI <= aNumberOfLines; anI++)
749 {
750 Standard_Integer aNumberOfIntervals = anIsoBuild.NbIntervals(anI);
751 Standard_Real aCoord = anIsoBuild.Coordinate(anI);
752 for (Standard_Integer aJ = 1; aJ <= aNumberOfIntervals; aJ++)
753 {
754 Standard_Real aB1 = anIsoBuild.Start (anI, aJ);
755 Standard_Real aB2 = anIsoBuild.End(anI, aJ);
756
757 if (!aGeomSurf.IsNull())
758 {
759 if (anIsoBuild.IsXLine (anI))
760 {
761 aBCurve = aGeomSurf->UIso (aCoord);
762 }
763 else
764 {
765 aBCurve = aGeomSurf->VIso (aCoord);
766 }
767
768 GeomAdaptor_Curve aGeomCurve (aBCurve);
769 FindLimits (aGeomCurve, aLimit, aB1, aB2);
770 if (aB2 - aB1 > Precision::Confusion())
771 {
772 IVtk_Polyline aPoints;
773 DrawCurve (aGeomCurve, aDeflection, anAngle, aB1, aB2, aPoints);
774 thePolylines.Append (aPoints);
775 }
776 }
777 else
778 {
779 if (anIsoBuild.IsXLine (anI))
780 {
781 anIso.Load (GeomAbs_IsoU, aCoord, aB1, aB2);
782 }
783 else
784 {
785 anIso.Load (GeomAbs_IsoV, aCoord, aB1, aB2);
786 }
787 FindLimits (anIso, aLimit, aB1, aB2);
788 if (aB2 - aB1>Precision::Confusion())
789 {
790 IVtk_Polyline aPoints;
791 DrawCurve (anIso, aDeflection, anAngle, aB1, aB2, aPoints);
792 thePolylines.Append (aPoints);
793 }
794 }
795 }
796 }
797}
798
799//================================================================
800// Function : addWFFace
801// Purpose :
802//================================================================
803void IVtkOCC_ShapeMesher::addWFFace (const TopoDS_Face& theFace,
804 const IVtk_IdType theShapeId)
805{
806 if (theFace.IsNull())
807 {
808 return;
809 }
810
811 TopoDS_Face aFaceToMesh = theFace;
812 aFaceToMesh.Orientation (TopAbs_FORWARD);
813
814 // The code that builds wireframe representation for a TopoDS_Face
815 // has been adapted from some OCCT 6.5.1 methods:
816 // - Prs3d_WFShape::Add()
817 // - StdPrs_WFDeflectionRestrictedFace::Add()
818 // - StdPrs_DeflectionCurve::Add()
819
820 // Add face's edges here but with the face ID
821 TopExp_Explorer anEdgeIter (aFaceToMesh, TopAbs_EDGE );
822 for (; anEdgeIter.More(); anEdgeIter.Next())
823 {
824 TopoDS_Edge anOcctEdge = TopoDS::Edge (anEdgeIter.Current());
825 addEdge (anOcctEdge, theShapeId, myEdgesTypes (anOcctEdge));
826 }
827
828 TopLoc_Location aLoc;
829 const Handle(Geom_Surface)& aGeomSurf = BRep_Tool::Surface (aFaceToMesh, aLoc);
830 if (aGeomSurf.IsNull())
831 {
832 return;
833 }
834
835 BRepAdaptor_Surface aSurf;
836 aSurf.Initialize (aFaceToMesh);
837 Handle(BRepAdaptor_HSurface) aSurfAdaptor = new BRepAdaptor_HSurface (aSurf);
838
839 IVtk_PolylineList aPolylines;
840 gp_Trsf aDummyTrsf;
841
842 // Building U isolines
843 // Introducing a local scope here to simplify variable naming
844 {
845 buildIsoLines (aSurfAdaptor,
dde68833 846 myNbIsos[0] != 0,
913a4c4a 847 Standard_False,
848 myNbIsos[0],
849 0,
850 aPolylines);
851
852 IVtk_PolylineList::Iterator anIt (aPolylines);
853 for (; anIt.More(); anIt.Next())
854 {
855 const IVtk_Polyline& aPntSeq = anIt.Value();
856 Standard_Integer aNbNodes = aPntSeq.Length();
857 TColgp_Array1OfPnt aPoints (1, aNbNodes);
858 for (Standard_Integer aJ = 1; aJ <= aNbNodes; aJ++)
859 {
860 aPoints.SetValue (aJ, aPntSeq.Value(aJ));
861 }
862
863 TColStd_Array1OfInteger aPointIds (1, aNbNodes);
864 for (Standard_Integer anI = 1; anI <= aNbNodes; anI++)
865 {
866 aPointIds.SetValue (anI, anI);
867 }
868
869 processPolyline (aNbNodes,
870 aPoints,
871 aPointIds,
872 theShapeId,
873 true,
874 aDummyTrsf,
875 MT_IsoLine);
876 }
877 }
878
879 // Building V isolines
880 {
881 aPolylines.Clear();
882 buildIsoLines (aSurfAdaptor,
883 Standard_False,
dde68833 884 myNbIsos[1] != 0,
913a4c4a 885 0,
886 myNbIsos[1],
887 aPolylines);
888
889 IVtk_PolylineList::Iterator anIt (aPolylines);
890 for (; anIt.More(); anIt.Next())
891 {
892 const IVtk_Polyline& aPntSeq = anIt.Value();
893 Standard_Integer aNbNodes = aPntSeq.Length();
894 TColgp_Array1OfPnt aPoints (1, aNbNodes);
895 for (int aJ = 1; aJ <= aNbNodes; aJ++)
896 {
897 aPoints.SetValue (aJ, aPntSeq.Value (aJ));
898 }
899
900 TColStd_Array1OfInteger aPointIds (1, aNbNodes);
901 for (Standard_Integer anI = 1; anI <= aNbNodes; anI++)
902 {
903 aPointIds.SetValue (anI, anI);
904 }
905
906 processPolyline (aNbNodes,
907 aPoints,
908 aPointIds,
909 theShapeId,
910 true,
911 aDummyTrsf,
912 MT_IsoLine);
913 }
914 }
915}
916
917//================================================================
918// Function : addShadedFace
919// Purpose :
920//================================================================
921void IVtkOCC_ShapeMesher::addShadedFace (const TopoDS_Face& theFace,
922 const IVtk_IdType theShapeId)
923{
924 if (theFace.IsNull())
925 {
926 return;
927 }
928
929 // Build triangulation of the face.
930 TopLoc_Location aLoc;
931 Handle(Poly_Triangulation) anOcctTriangulation = BRep_Tool::Triangulation (theFace, aLoc);
932 if (anOcctTriangulation.IsNull())
933 {
934 return;
935 }
936
937 gp_Trsf aPntTransform;
938 Standard_Boolean noTransform = Standard_True;
939 if (!aLoc.IsIdentity())
940 {
941 noTransform = Standard_False;
942 aPntTransform = aLoc.Transformation();
943 }
944
945 // Get triangulation points.
946 const TColgp_Array1OfPnt& aPoints = anOcctTriangulation->Nodes();
947 Standard_Integer aNbPoints = anOcctTriangulation->NbNodes();
948
949 // Keep inserted points id's of triangulation in an array.
950 NCollection_Array1<IVtk_PointId> aPointIds (1, aNbPoints);
951 IVtk_PointId anId;
952
953 Standard_Integer anI;
954 for (anI = 1; anI <= aNbPoints; anI++)
955 {
956 gp_Pnt aPoint = aPoints (anI);
957
958 if (!noTransform)
959 {
960 aPoint.Transform (aPntTransform);
961 }
962
963 // Add a point into output shape data and keep its id in the array.
964 anId = myShapeData->InsertCoordinate (aPoint.X(), aPoint.Y(), aPoint.Z());
965 aPointIds.SetValue (anI, anId);
966 }
967
968 // Create triangles on the created triangulation points.
969 const Poly_Array1OfTriangle& aTriangles = anOcctTriangulation->Triangles();
970 Standard_Integer aNbTriangles = anOcctTriangulation->NbTriangles();
971 Standard_Integer aN1, aN2, aN3;
972 for (anI = 1; anI <= aNbTriangles; anI++)
973 {
974 aTriangles(anI).Get (aN1, aN2, aN3); // get indexes of triangle's points
975 // Insert new triangle on these points into output shape data.
976 myShapeData->InsertTriangle (
977 theShapeId, aPointIds(aN1), aPointIds(aN2), aPointIds(aN3), MT_ShadedFace);
978 }
979}
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