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        void ofApp::setup(){
    increment = 0.01;
    ofSetWindowShape(500, 500);
    gif.setupPaused(ofGetTimestampString("out/%Y-%m-%d"), 230, 279);
    gif.fadeInOut(8, 2, ofColor::white, 1);
    masker.setup(3);
    transp1.setup("road-transp.png");
    transp1.setTexturePositionY(0.5);
    transp2.setup("road-transp.png");
    transp2.setTexturePositionY(0.5);
    transp3.setup("road-transp.png");
    transp3.setTexturePositionY(0.5);
    transp4.setup("road-transp.png");
    transp4.setTexturePositionY(0.5);
    transp5.setup("road-transp.png");
    transp5.setTexturePositionY(0.5);
    transp6.setup("road-transp.png");
    transp6.setTexturePositionY(0.5);
}

void ofApp::update(){
    masker.beginLayer(0);
    {
        transp1.incrementTextureOffsetY(-increment);
        transp1.incrementTextureScale(-increment);
        transp1.draw();
    }
    masker.endLayer(0);

    masker.beginMask(0);
    {
        transp2.incrementTextureOffsetY(-increment);
        transp2.incrementTextureScale(-increment*0.5);
        ofBackground(ofColor::white);
        ofSetColor(ofColor::white);
        transp2.draw();
    }
    masker.endMask(0);
    
    masker.beginLayer(1);
    {
        transp3.incrementTextureOffsetY(increment);
        transp3.incrementTextureScale(increment);
        transp3.draw();
    }
    masker.endLayer(1);
    
    masker.beginMask(1);
    {
        transp4.incrementTextureOffsetY(increment);
        transp4.incrementTextureScale(increment*0.5);
        ofBackground(ofColor::white);
        ofSetColor(ofColor::white);
        transp4.draw();
    }
    masker.endMask(1);
    
    masker.beginLayer(2);
    {
        transp5.incrementTextureOffsetX(increment);
        transp5.incrementTextureScale(-increment);
        transp5.draw();
    }
    masker.endLayer(2);
    
    masker.beginMask(2);
    {
        transp6.incrementTextureOffsetX(-increment);
        transp6.incrementTextureScale(increment*0.5);
        ofBackground(ofColor::white);
        ofSetColor(ofColor::white);
        transp6.draw();
    }
    masker.endMask(2);
}

void ofApp::draw(){
    gif.begin();
    {
        ofBackground(ofColor::white);
        masker.draw();
    }
    gif.endAndCaptureFrame();
    gif.draw();
    masker.drawOverlay();
}