osgUtil::DelaunayTriangulator正反面问题
用osgUtil::DelaunayTriangulator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：
void OsgViewWidget::setCoordinates(const double *coords, int size)
{
osg::ref_ptr<osg::Vec3Array> pointArray = new osg::Vec3Array();
for (int i = 0; i < size; i += 3)
pointArray->push_back(osg::Vec3(coords, coords, -coords * 10)); // Z值相对较小，这里放大10倍
osg::ref_ptr<osgUtil::DelaunayTriangulator> dt = new osgUtil::DelaunayTriangulator();
dt->setInputPointArray(pointArray);
dt->setOutputNormalArray(normals);
dt->triangulate();
osg::ref_ptr<osg::Geometry> geom = new osg::Geometry();
geom->setVertexArray(pointArray.get());
geom->addPrimitiveSet(dt->getTriangles());
geom->setNormalArray(normals.get());
geom->setNormalBinding(osg::Geometry::BIND_PER_PRIMITIVE_SET);
osg::ref_ptr<osg::Geode> geode = new osg::Geode();
geode->addDrawable(geom.get());
// use smoothing visitor to set the average normals
osgUtil::SmoothingVisitor sv;
sv.apply(*geode);
// set material for the surface
osg::ref_ptr<osg::StateSet> stateSet = geom->getOrCreateStateSet();
// osg::ref_ptr<osg::Material> material = new osg::Material();
// material->setDiffuse(osg::Material::FRONT, /*osg::Vec4(1.0f, 1.0f, 0.0f, 1.0f)*/_surfaceColor);
// material->setSpecular(osg::Material::FRONT, osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f));
// material->setShininess(osg::Material::FRONT, 100.0f);
// stateSet->setAttribute(material);
osg::PolygonMode *polyMode = new osg::PolygonMode();
polyMode->setMode(osg::PolygonMode::FRONT_AND_BACK, osg::PolygonMode::LINE);
stateSet->setAttribute(polyMode);
osg::ref_ptr<osg::MatrixTransform> cameraPos = new osg::MatrixTransform();
cameraPos->setMatrix(osg::Matrix::rotate(osg::inDegrees(45.f), 1, 0, 0));
cameraPos->addChild(geode);
osg::ref_ptr<osg::Group> root = new osg::Group();
root->addChild(cameraPos);
_viewer->setSceneData(root.get());
}
另外，osgUtil::DelaunayTriangulator怎么处理凹多边形的问题，也请一并指教。谢谢！
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