OSG屏幕坐标——相机坐标——世界坐标之间的转换

最新推荐文章于 2024-09-14 10:08:11 发布

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最新推荐文章于 2024-09-14 10:08:11 发布 · 3.7k 阅读

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本文介绍了使用OSG(OpenSceneGraph)进行不同坐标系之间的转换方法，包括屏幕坐标到世界坐标、世界坐标到屏幕坐标等。通过这些转换，可以更好地理解和操作三维场景。

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 = ca