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        void ofApp::setup(){
    ofSetWindowShape(500, 500);
    gif.setup(ofGetTimestampString("out/%Y-%m-%d"), 47);
    gif.fadeInOut(3, 6, ofColor::white);
    gif.enableTextOverlay();
    numRoads = 2;
    masker.setup(numRoads);
    
    road.setup("road.png", 1.0, TEXTURE_OFFSET__MIDDLE__RIGHT_TO_CENTER);
    for(int i = 0; i < numRoads; i++) {
        scale = ofMap(i, 0, numRoads-1, 1, 6);
        road.setTextureScale(scale);
        road.setTextureOffsetY(ofRandom(2));
        road1s.push_back(road);
    }
    
    road.setup("road.png", 1.0, TEXTURE_OFFSET__MIDDLE__RIGHT_TO_CENTER);
    for(int i = 0; i < numRoads; i++) {
        scale = ofMap(i, 0, numRoads-1, 6, 1);
        road.setTextureScale(scale);
        road.setTextureOffsetY(ofRandom(2));
        road2s.push_back(road);
    }
}

void ofApp::update(){
    for(int i = 0; i < numRoads; i++) {
        masker.beginLayer(i);
        {
            road1s.at(i).incrementTextureOffsetY(ofMap(i, 0, numRoads-1, -0.002, 0.002));
            road1s.at(i).draw();
        }
        masker.endLayer(i);
        
        masker.beginMask(i);
        {
            road2s.at(i).incrementTextureOffsetY(ofMap(i, 0, numRoads-1, -0.002, 0.002));
            road2s.at(i).draw();
        }
        masker.endMask(i);
    }
}

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