OSG学习笔记25——屏幕坐标——相机坐标——世界坐标之间的转换

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osg::Vec3d TrackballRotate::screen2World(osg::Vec3 screenPoint)//将屏幕坐标转换到世界坐标
{
   osg::Vec3d vec3;
   osg::ref_ptr<osg::Camera> camera = viewer->getCamera();
   //osg::Vec3d vScreen(x,y, 0);
   osg::Matrix mVPW = camera->getViewMatrix() * camera->getProjectionMatrix() * camera->getViewport()->computeWindowMatrix();
   osg::Matrix invertVPW;
   invertVPW.invert(mVPW);
   vec3 = screenPoint * invertVPW;
   return vec3;
}
osg::Vec3d TrackballRotate::world2Screen(osg::Vec3 worldPoint)//世界到屏幕
{
   osg::Vec3d vec3;
   osg::ref_ptr<osg::Camera> camera = viewer->getCamera();
   osg::Matrix mVPW = camera->getViewMatrix() * camera->getProjectionMatrix() * camera->getViewport()->computeWindowMatrix();
   vec3 = worldPoint * mVPW;
   return vec3;
}

osg::Vec3d TrackballRotate::world2Camera(osg::Vec3 worldPoint)//世界转相机
{
   osg::Vec3d vec3;
   osg::ref_ptr<osg::Camera> camera = viewer->getCamera();
   osg::Matrix mV = camera->getViewMatrix();
   vec3 = worldPoint * mV;
   return vec3;
}
osg::Vec3d TrackballRotate::camera2World(osg::Vec3 cameraPoint)//相机转世界
{
   osg::Vec3d vec3;
   osg::ref_ptr<osg::Camera> camera = viewer->getCamera();
   //osg::Vec3d vScreen(x,y, 0);
   osg::Matrix mV = camera->getViewMatrix();
   osg::Matrix invertmV;
   invertmV.invert(mV);
   vec3 = cameraPoint * invertmV ;
   return vec3;
}
osg::Vec3d TrackballRotate::screen2Camera(osg::Vec3 screenPoint)//屏幕转相机
{
   osg::Vec3d vec3;
   osg::ref_ptr<osg::Camera> camera = viewer->getCamera();
   osg::Matrix mPW = camera->getProjectionMatrix() * camera->getViewport()->computeWindowMatrix();
   osg::Matrix invertmPW;
   invertmPW.invert(mPW);
   vec3 = screenPoint * invertmPW;
   return vec3;
}
osg::Vec3d TrackballRotate::camera2Screen(osg::Vec3 cameraPoint)//相机转屏幕
{
   osg::Vec3d vec3;
   osg::ref_ptr<osg::Camera> camera = viewer->getCamera();
   //osg::Vec3d vScreen(x,y, 0);
   osg::Matrix mPW = camera->getProjectionMatrix() * camera->getViewport()->computeWindowMatrix();
   vec3 = cameraPoint * mPW;
   return vec3;
}

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