OSG中屏幕坐标和世界坐标的转化

屏幕-------->世界

可以使用osgUtil::SceneView::ProjectWindowIntoObject()来计算

bool SceneView::projectWindowIntoObject(const osg::Vec3& window,osg::Vec3& object) const
{
    osg::Matrix inverseMVPW;
    inverseMVPW.invert(computeMVPW());

    object = window*inverseMVPW;

    return true;
}
const osg::Matrix SceneView::computeMVPW() const
{
    osg::Matrix matrix( getViewMatrix() * getProjectionMatrix());

    if (getViewport())
        matrix.postMult(getViewport()->computeWindowMatrix());
    else
        OSG_WARN<<"osg::Matrix SceneView::computeMVPW() - error no viewport attached to SceneView, coords will be computed inccorectly."<<std::endl;

    return matrix;
}

或者自己运算

Matrix VPW = camera->getViewMatrix() *
             camera->getProjectionMatrix() *
             camera->getViewport()->computeWindowMatrix();
Matrix inverseVPW = Matrix::inverse(VPW);
Vec3d world = window * inverseVPW;

世界------>屏幕

就是上面的矩阵不要求逆即可！