Irrlicht Engine

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void RealisticWaterSceneNode::OnAnimate(u32 timeMs)
{
    ISceneNode::OnAnimate(timeMs);
 
    _time = timeMs;
 
    //fixes glitches with incomplete refraction
    const f32 CLIP_PLANE_OFFSET_Y = 5.0f;
 
    if (IsVisible)
    {
        setVisible(false); //hide the water
 
 
        // seven - save the viewport, modify it and then later return it to original.
        const irr::core::rect<s32> r(100,100,150,200);
        irr::core::rect<s32> oldViewport = _videoDriver->getViewPort();
        _videoDriver->setViewPort(r);
 
 
 
        //refraction
        _videoDriver->setRenderTarget(_refractionMap, true, true); //render to refraction
 
        //refraction clipping plane
        core::plane3d<f32> refractionClipPlane(0, RelativeTranslation.Y + CLIP_PLANE_OFFSET_Y, 0, 0, -1, 0); //refraction clip plane
        _videoDriver->setClipPlane(0, refractionClipPlane, true);
 
        _sceneManager->drawAll(); //draw the scene
 
        //reflection
        _videoDriver->setRenderTarget(_reflectionMap, true, true); //render to reflection
 
        //get current camera
        scene::ICameraSceneNode* currentCamera = _sceneManager->getActiveCamera();
 
        //set FOV anf far value from current camera
        _camera->setFarValue(currentCamera->getFarValue());
        _camera->setFOV(currentCamera->getFOV());
 
        core::vector3df position = currentCamera->getAbsolutePosition();
        position.Y = -position.Y + 2 * RelativeTranslation.Y; //position of the water
        _camera->setPosition(position);
 
        core::vector3df target = currentCamera->getTarget();
 
        //invert Y position of current camera
        target.Y = -target.Y + 2 * RelativeTranslation.Y;
        _camera->setTarget(target);
 
        //set the reflection camera
        _sceneManager->setActiveCamera(_camera);
 
        //reflection clipping plane
        core::plane3d<f32> reflectionClipPlane(0, RelativeTranslation.Y - CLIP_PLANE_OFFSET_Y, 0, 0, 1, 0);
        _videoDriver->setClipPlane(0, reflectionClipPlane, true);
 
        _sceneManager->drawAll(); //draw the scene
 
        //disable clip plane
        _videoDriver->enableClipPlane(0, false);
 
        //set back old render target
        _videoDriver->setRenderTarget(0);
 
        //set back the active camera
        _sceneManager->setActiveCamera(currentCamera);
 
        // seven - return the viewport to the original size
        _videoDriver->setViewPort(oldViewport);
 
        setVisible(true); //show it again
    }
}