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Transparency example 2

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  1. Its a modification of the Viewer example from the Qucik start guide.
  2. It loads up a cow and overrides the alpha to 0.1. 
  3. Hope you can start from there.
  4.  
  5. Dimi
  6.  
  7. // Viewer Example, A minimal OSG viewer 
  8. #include <osgDB/WriteFile> 
  9. #include <osg/Notify> 
  10. #include <osgViewer/Viewer> 
  11. #include <osgDB/ReadFile> 
  12. #include <osg/MatrixTransform> 
  13. #include <osg/Geode> 
  14. #include <osg/Geometry> 
  15. #include <osg/StateSet> 
  16. #include <osg/StateAttribute> 
  17. #include <osg/CullFace> 
  18. #include <osg/Point> 
  19. #include <osg/Light> 
  20. #include <osg/LightSource> 
  21. #include <osg/BlendFunc> 
  22. #include <osg/Material> 
  23. #include <osg/PolygonMode> 
  24. #include <osg/Notify> 
  25.  
  26. int 
  27. main( int, char ** ) 
  28. { 
  29.     // Create a Viewer. 
  30.     osgViewer::Viewer viewer; 
  31.  
  32.     // Load a model and add it to the Viewer.
  33.     osg::ref_ptr<osg::Node> nde = osgDB::readNodeFile( "cow.osg" );
  34.  
  35.     // Create StateSet and Material
  36.     osg::StateSet* state2 = nde->getOrCreateStateSet(); 
  37.     osg::ref_ptr<osg::Material> mat2 = new osg::Material; 
  38.  
  39.     // Set alpha to 0.1
  40.     mat2->setAlpha(osg::Material::FRONT_AND_BACK, 0.1); 
  41.     state2->setAttributeAndModes( mat2.get() , osg::StateAttribute::ON | 
  42. osg::StateAttribute::OVERRIDE);
  43.  
  44.      // Turn on blending 
  45.     osg::BlendFunc* bf = new osg::BlendFunc(osg::BlendFunc::SRC_ALPHA, 
  46. osg::BlendFunc::ONE_MINUS_SRC_ALPHA ); 
  47.     state2->setAttributeAndModes(bf);
  48.  
  49.     viewer.setSceneData(nde.get());
  50.  
  51.     if (!viewer.getSceneData()) 
  52.     { 
  53.         osg::notify( osg::FATAL ) << "Unable to load data file. Exiting." << 
  54. std::endl; 
  55.         return 1; 
  56.     }
  57.  
  58.     // Display, and main loop. 
  59.     return viewer.run(); 
  60. }

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