用PolytopeIntersector选择Quad有时无法选中

267270476

quad生成：

1. osg::ref_ptr<osg::Geometry> OsgGeometryBuilder::getQuadGeometry(
   
2.     const osg::ref_ptr<osg::Vec3Array>& aVertexArray)
   
3. {
   
4.     osg::ref_ptr<osg::Geometry> aVertexQuad = new osg::Geometry();
   
5.     aVertexQuad->setVertexArray(aVertexArray.get());
   
6.     osg::ref_ptr<osg::Vec3Array> normals = new osg::Vec3Array(1);
   
7.     (*normals)[0].set(0, 0, -1);
   
8.     aVertexQuad->setNormalArray(normals.get());
   
9.     aVertexQuad->setNormalBinding(osg::Geometry::BIND_OVERALL);
   
10.     aVertexQuad->addPrimitiveSet(new osg::DrawArrays(osg::DrawArrays::QUADS, 0, aVertexArray->size()));
    
11.     return aVertexQuad;
    
12. }
    

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1. osg::ref_ptr<osg::Group> OsgGeometryBuilder::CreateQuadOsgGeometryFromCenter(
   
2.     const new_geometry::Vertex3d& aCenter,
   
3.     const double& aWidth)
   
4. {
   
5.     osg::ref_ptr<osg::Geode> geode = new osg::Geode;
   
6. 
   
7.     std::vector<new_geometry::Vertex3d> vertice3Ds = getQuadVertices(aCenter, aWidth);
   
8.     float deltaX = 0;
   
9.     float deltaY = 0;
   
10.     osg::ref_ptr<osg::Vec3Array> vertexArray = getOptimizedVec3Array(
    
11.             &vertice3Ds,
    
12.             deltaX,
    
13.             deltaY);
    
14.     osg::ref_ptr<osg::Geometry> vertexQuad = getQuadGeometry(vertexArray);
    
15.     geode->addDrawable(vertexQuad);
    
16.     osg::ref_ptr<osg::MatrixTransform> transformer = new osg::MatrixTransform;
    
17.     transformer->addChild(geode);
    
18.     transformer->setMatrix(osg::Matrix::translate(deltaX, deltaY, 0));
    
19.     osg::ref_ptr<osg::Group> group = new osg::Group;
    
20.     group->addChild(transformer);
    
21.     return group;
    
22. }

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Intersector生成：

1. osg::ref_ptr<osgUtil::PolytopeIntersector> OsgIntersectorEventHandler::getPolytopeIntersector(
   
2.     const osgGA::GUIEventAdapter& aEventAdapter,
   
3.     const double& aWidth,
   
4.     const double& aHeight)
   
5. {
   
6.     double centerX = aEventAdapter.getXnormalized();
   
7.     double centerY = aEventAdapter.getYnormalized();
   
8.     osg::ref_ptr<osgUtil::PolytopeIntersector> picker(
   
9.         new osgUtil::PolytopeIntersector(
   
10.                 osgUtil::Intersector::PROJECTION,
    
11.                 centerX - aWidth,
    
12.                 centerY - aHeight,
    
13.                 centerX + aWidth,
    
14.                 centerY + aHeight)
    
15.     );
    
16.     return picker;
    
17. }

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Quad的边长为0.04，求交器的长宽都为0.02.
跪求大神们帮忙！

array

凭目前的信息我无法猜测什么，您可以多测试一下别的情形