用osgearth2.4的时候，导出osgEarth::Annotation::PlaceNode到ive的时候出错了

wanghan19911117

1. #include <osg/Notify>
   
2. #include <osgViewer/Viewer>
   
3. #include <osgEarthUtil/EarthManipulator>
   
4. #include <osgEarthUtil/ExampleResources>
   
5. #include <osgEarthAnnotation/ModelNode>
   
6. 
   
7. #include <osgEarthAnnotation/PlaceNode>
   
8. 
   
9. int main()
   
10. {
    
11.         int argc = 2;
    
12.         char* argv[2];
    
13.         argv[0] = "*.exe";
    
14.         argv[1] = "D:\\RUNTIME\\osgearth-3.0.1-2.4\\Release\\tests\\gdal_tiff.earth";
    
15. 
    
16.         osg::ArgumentParser arguments( &argc, argv );
    
17.         osg::ref_ptr<osgViewer::Viewer> viewer=new osgViewer::Viewer(arguments);
    
18.         osg::ref_ptr<osg::Group> group=new osg::Group;
    
19. 
    
20.         viewer->getDatabasePager()->setUnrefImageDataAfterApplyPolicy( false, false );
    
21.        
    
22.         osg::ref_ptr<osgEarth::Util::EarthManipulator> em=new osgEarth::Util::EarthManipulator;
    
23.         viewer->setCameraManipulator(em);
    
24. 
    
25.         osg::ref_ptr<osg::Node> earthFileNode=osgEarth::Util::MapNodeHelper().load(arguments,viewer);
    
26.         osgEarth::MapNode* mapNode = osgEarth::MapNode::findMapNode(earthFileNode);
    
27. 
    
28.         group->addChild(earthFileNode);
    
29. 
    
30.         //add Annotation:
    
31.         osgEarth::Symbology::Style AnnotationStyle;
    
32.         AnnotationStyle.getOrCreate<osgEarth::IconSymbol>()->url()->setLiteral( "D:/EARTH/data/images/PNG/placemark32.png" );
    
33.         AnnotationStyle.getOrCreate<osgEarth::Annotation::TextSymbol>()->size() =50.0;
    
34.         const osgEarth::SpatialReference* geoSRS=mapNode->getMapSRS()->getGeographicSRS();
    
35.         osg::ref_ptr<osgEarth::Annotation::PlaceNode> pn=new osgEarth::Annotation::PlaceNode(mapNode,osgEarth::GeoPoint(geoSRS, -74.00, 40.71), "New York", AnnotationStyle);
    
36.         group->addChild(pn);
    
37. 
    
38.         //output Annotation:
    
39.         osgDB::Registry::instance()->writeNode(*pn,"Annotation.ive",osgDB::Registry::instance()->getOptions());
    
40. 
    
41. 
    
42.     if ( earthFileNode )
    
43.     {
    
44.         viewer->setSceneData( group );
    
45. 
    
46.         viewer->getCamera()->setNearFarRatio(0.00002);
    
47.         viewer->getCamera()->setSmallFeatureCullingPixelSize(-1.0f);
    
48. 
    
49.         viewer->run();
    
50.     }
    
51. 
    
52.     return 0;
    
53. }
    

复制代码

以上是源代码，下面是报错：
Error writing IVE image: StateSet::write(): Unknown StateAttribute: VirtualProgram

zhufu0208

从错误代码中看应该是ive在写的时候不识别VirtualProgram属性
造成这种情况的原因可能是osg版本和osgearth版本不一致   或者VirtualProgram属性不是osg的属性  而是osgearth中自定义的

wanghan19911117

VirtualProgram在2.3版本之前是没有的，这是osgearh的属性，用osg是没法直接输出的