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        void ofApp::setup(){
    ofSetWindowShape(500, 500);
    gif.setup(50);
    gif.fadeInOut(2, 3, ofColor::darkGray);
    gif.enableTextOverlay();
    numLayers = 4;
    numRects = gif.width * 0.5;
    masker.setup(numLayers);
    
    img.setup("road.png", 1.0, TEXTURE_OFFSET__MIDDLE__RIGHT_TO_CENTER);
    for(int i = 0; i < numLayers; i++) {
        scale = ofMap(i, 0, numLayers-1, -3, 16);
        img.setTextureScale(scale);
        img.setTextureOffsetY(ofRandom(2));
        textures.push_back(img);
    }
    
    img.setup("pcb2.png", 1.0, TEXTURE_OFFSET__MIDDLE__LEFT_TO_CENTER);
    for(int i = 0; i < numLayers; i++) {
        scale = ofMap(i, 0, numLayers-1, 2, 1);
        img.setTextureScale(scale);
        img.setTextureOffsetY(ofRandom(2));
        masks.push_back(img);
    }

    for(int i = 0; i < numRects; i++) {
        rectAlphaMultipliers.push_back(ofRandom(0.1, 0.5));
    }
    rectWidth = gif.width / numRects;
    
    ofSetWindowShape(1200, 1200);
    masker.toggleOverlay();
}

void ofApp::update(){
    for(int i = 0; i < numLayers; i++) {
        masker.beginLayer(i);
        {
            textures.at(i).incrementTextureOffsetY(ofMap(i, 0, numLayers-1, -0.002, 0.002));
            textures.at(i).draw();
        }
        masker.endLayer(i);
        
        masker.beginMask(i);
        {
            masks.at(i).incrementTextureOffsetY(ofMap(i, 0, numLayers-1, -0.002, 0.002));
            masks.at(i).draw();
        }
        masker.endMask(i);
    }
}

void ofApp::draw(){
    gif.begin();
    {
        masker.draw();
    }
    gif.endCaptureDraw();
    masker.drawOverlay();
}