osgUtil::DelaunayTriangulator正反面问题

ljq1000

用osgUtil:elaunayTriangulator构建了一块地形，但是中间有一块好像是正反面反转了，不知何因，请大佬们指教。
代码：

1. void OsgViewWidget::setCoordinates(const double *coords, int size)
   
2. {
   
3.     osg::ref_ptr<osg::Vec3Array> pointArray = new osg::Vec3Array();
   
4.     for (int i = 0; i < size; i += 3)
   
5.         pointArray->push_back(osg::Vec3(coords[i], coords[i + 1], -coords[i + 2] * 10)); // Z值相对较小，这里放大10倍
   
6. 
   
7.     osg::ref_ptr<osgUtil::DelaunayTriangulator> dt = new osgUtil::DelaunayTriangulator();
   
8.     dt->setInputPointArray(pointArray);
   
9.     dt->setOutputNormalArray(normals);
   
10.     dt->triangulate();
    
11. 
    
12.     osg::ref_ptr<osg::Geometry> geom = new osg::Geometry();
    
13.     geom->setVertexArray(pointArray.get());
    
14.     geom->addPrimitiveSet(dt->getTriangles());
    
15.     geom->setNormalArray(normals.get());
    
16.     geom->setNormalBinding(osg::Geometry::BIND_PER_PRIMITIVE_SET);
    
17. 
    
18.     osg::ref_ptr<osg::Geode> geode = new osg::Geode();
    
19.     geode->addDrawable(geom.get());
    
20. 
    
21.     // use smoothing visitor to set the average normals
    
22.     osgUtil::SmoothingVisitor sv;
    
23.     sv.apply(*geode);
    
24. 
    
25.     // set material for the surface
    
26.     osg::ref_ptr<osg::StateSet> stateSet = geom->getOrCreateStateSet();
    
27. //    osg::ref_ptr<osg::Material> material = new osg::Material();
    
28. //    material->setDiffuse(osg::Material::FRONT, /*osg::Vec4(1.0f, 1.0f, 0.0f, 1.0f)*/_surfaceColor);
    
29. //    material->setSpecular(osg::Material::FRONT, osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f));
    
30. //    material->setShininess(osg::Material::FRONT, 100.0f);
    
31. //    stateSet->setAttribute(material);
    
32. 
    
33.     osg::PolygonMode *polyMode = new osg::PolygonMode();
    
34.     polyMode->setMode(osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::LINE);
    
35.     stateSet->setAttribute(polyMode);
    
36. 
    
37.     osg::ref_ptr<osg::MatrixTransform> cameraPos = new osg::MatrixTransform();
    
38.     cameraPos->setMatrix(osg::Matrix::rotate(osg::inDegrees(45.f), 1, 0, 0));
    
39.     cameraPos->addChild(geode);
    
40. 
    
41.     osg::ref_ptr<osg::Group> root = new osg::Group();
    
42.     root->addChild(cameraPos);
    
43.     _viewer->setSceneData(root.get());
    
44. }

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另外，osgUtil::DelaunayTriangulator怎么处理凹多边形的问题，也请一并指教。谢谢！