perparesettings not working

prepSet

#include "cinder/app/App.h"
#include "cinder/app/RendererGl.h"
#include "cinder/gl/gl.h"
#include "cinder/GeomIO.h"
#include "cinder/ImageIo.h"
#include "cinder/MayaCamUI.h"
#include "cinder/Utilities.h"
#include "cinder/Rand.h"

#include <sstream>
#include <list>

#include "Resources.h"

using namespace ci;
using namespace ci::app;
using namespace std;

using std::vector;

using namespace ci;
using namespace ci::app;
using namespace std;

class DigitalFabricApp : public App {
  public:

    void	setup() override;
    void	update() override;
    void	draw() override;
    
    void    record();
    void	keyDown( KeyEvent event ) override;
    void    mouseDown(MouseEvent event);
    
    void    prepareSettings( Settings *settings );
    
  //  bool    saveGif;
  //  int     mCurrentFrame;

private:
    gl::VboMeshRef	mVboMesh;
    gl::TextureRef	mTexture;
    MayaCamUI		mMayaCam;
};

void DigitalFabricApp::prepareSettings( Settings *settings )
{
    settings->setWindowSize( 1280,720 );
    settings->setFrameRate( 30.0f );
}

void DigitalFabricApp::setup()
{
    
        //SUBSTITUTE THE FOLLOWING BLOCK OF CODE WITH A 640X480 GRID THAT REPRESENTS THE RAW
        //DEPTH VALUES COMING FROM THE KINECT
    
        //-----------------------------------------------------------------------
    
        // create some geometry using a geom::Plane
        auto plane = geom::Plane().size( vec2( 20, 20 ) ).subdivisions( ivec2( 200, 50 ) );
        
        // Specify two planar buffers - positions are dynamic because they will be modified
        // in the update() loop. Tex Coords are static since we don't need to update them.
        vector<gl::VboMesh::Layout> bufferLayout = {
            gl::VboMesh::Layout().usage( GL_DYNAMIC_DRAW ).attrib( geom::Attrib::POSITION, 3 ),
            //gl::VboMesh::Layout().usage( GL_STATIC_DRAW ).attrib( geom::Attrib::TEX_COORD_0, 2 )
        };
        
        mVboMesh = gl::VboMesh::create( plane, bufferLayout );
    
        //------------------------------------------------------------------------
        
        mMayaCam.connect( getWindow() );
        
 //       saveGif = false;
 //       mCurrentFrame = 0;
}


void DigitalFabricApp::mouseDown( MouseEvent event )
{
}
    
void DigitalFabricApp::keyDown(KeyEvent event){
    /*
        if (event.getChar() =='s' )
            saveGif = true;
     */
}

void DigitalFabricApp::update()
{
    float offset = getElapsedSeconds() * 4.0f;
    
    //REPLACE THE FOLLOWING CODE BLOCK WITH THE UPDATED Z-POSITIONS THAT ARE EXTRACTED FROM
    //THE KINECT'S DATA.
    //--------------------------------------------------------------------------
    auto mappedPosAttrib = mVboMesh->mapAttrib3f( geom::Attrib::POSITION, false );
    for( int i = 0; i < mVboMesh->getNumVertices(); i++ ) {
        vec3 &pos = *mappedPosAttrib;
        mappedPosAttrib->y = sinf( pos.x * 1.1467f + offset ) * 0.323f + cosf( pos.z * 0.7325f + offset ) * 0.431f;
        ++mappedPosAttrib;
    }
    mappedPosAttrib.unmap();
    //--------------------------------------------------------------------------
    
    /*
    if (saveGif == true && mCurrentFrame % 4 == 0 && mCurrentFrame < 125){
        writeImage( getDocumentsDirectory() / "cinder" / "gif" / "saveGifB_" / ( toString( mCurrentFrame ) + ".png" ), copyWindowSurface() );
    }
    
    if (saveGif == true){
        mCurrentFrame++;
        
        cout << mCurrentFrame << endl;
    }
     */
    
    cout << getWindowWidth();
    cout << " ";
    cout << getWindowHeight() << endl;
}

void DigitalFabricApp::draw()
{
    gl::clear( Color( 0.15f, 0.15f, 0.15f ) );
    
    gl::setMatrices( mMayaCam.getCamera() );
    
    gl::draw( mVboMesh );
}

CINDER_APP( DigitalFabricApp, RendererGl )