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标题: 急：关于获取曲面的信息（节点、控制点等）有些疑问，代码如下 [打印本页]

作者: 124225512 时间: 2011-8-14 10:47
标题: 急：关于获取曲面的信息（节点、控制点等）有些疑问，代码如下
总的思路是获得面后转换为nurbs曲面，CATSurface有获得节点信息的函数GetKnotVectorU/V，CATNurbsSurface有获得控制点的函数GetOneControlPoint(CATLONG,CATLONG,CATMathPoint)，节点好像是对的，但是控制点的输出很奇怪，很多零。请我呢有人知道怎么解决这个问题吗？可能我的思路也是有问题的，不知道有没有其他办法。目的就是获得曲面的表示。
if ( _spSurface != NULL )
      {
            CATSurface  *_SurfaceToBeInvented;
            HRESULT rc = _spSurface->QueryInterface(IID_CATSurface , (void**)&_SurfaceToBeInvented);
            if (FAILED(rc))
            {
                     return;
            }
            if (_SurfaceToBeInvented==NULL)return;


            if (SUCCEEDED(rc))
            {
                     const CATKnotVector *KV4DEG=_SurfaceToBeInvented->GetKnotVectorU();
                     const CATKnotVector *KV4DEGV=_SurfaceToBeInvented->GetKnotVectorV();

                     if (KV4DEG!=NULL&&KV4DEGV!=NULL)
                     {

                              const double * Knots4DEG = NULL;
                              KV4DEG->GetKnots(Knots4DEG);

                              const double * Knots4DEGV = NULL;
                              KV4DEGV->GetKnots(Knots4DEGV);

                              CATLONG32 NbKnots4DEG = KV4DEG->GetNumberOfKnots();
                              CATLONG32 NbOfCPs4DEG = KV4DEG->GetNumberOfControlPoints();
                              CATLONG32 NewNbArcs4DEG = KV4DEG->GetNumberOfArcs();
                              CATLONG32 NewDegree4DEG = KV4DEG->GetDegree();

                              CATLONG32 NbKnots4DEGV = KV4DEGV->GetNumberOfKnots();
                              CATLONG32 NbOfCPs4DEGV = KV4DEGV->GetNumberOfControlPoints();
                              CATLONG32 NewNbArcs4DEGV = KV4DEGV->GetNumberOfArcs();
                              CATLONG32 NewDegree4DEGV = KV4DEGV->GetDegree();


                              CATGeoFactory* piGeomFactory = ::CATCreateCGMContainer() ;
                              if (NULL==piGeomFactory) return;

                              CATSurLimits surLimits;
                              _SurfaceToBeInvented->GetLimits(surLimits);

                              CATSurFittingToNurbsSur * pSurFitting1 =
                                    ::CATCreateSurFittingToNurbsSur(piGeomFactory,
                                    _SurfaceToBeInvented,
                                    surLimits,
                                    0.001,
                                    0,
                                    ADVANCED);

                              if (NULL==pSurFitting1)
                              {
                                    ::CATCloseCGMContainer(piGeomFactory);
                                    return;
                              }

if (_SurfaceToBeInvented!=NULL)
{
      _SurfaceToBeInvented->Release();
      _SurfaceToBeInvented=NULL;
}

                              pSurFitting1->Run();
                              CATNurbsSurface * pNurbsSurf1=NULL;
                              pNurbsSurf1= pSurFitting1->GetNurbsSurface();

                              if (NULL==pNurbsSurf1)
                              {
                                    ::CATCloseCGMContainer(piGeomFactory);
                                    return ;
                              }


                              if (NULL!=pNurbsSurf1)
                              {
                                    CATMathPoint  * tabOfCPs  = new CATMathPoint [NbOfCPs4DEG*NbOfCPs4DEGV];

                                    for (CATLONG32 i=0; i<NbOfCPs4DEG; i++)
                                    {
                                             for(CATLONG32 j=0;j<NbOfCPs4DEGV;j++)
                                             {

                                                      pNurbsSurf1->GetOneControlPoint(i+1, j+1,tabOfCPs[i+j]);


                                             }
                                    }


                              }

if (pSurFitting1!=NULL)
{
      delete pSurFitting1;
      pSurFitting1=NULL;
}

                              ::CATCloseCGMContainer(piGeomFactory);

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