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        void ofApp::setup(){
    ofSetWindowShape(500, 500);
    gif.setupPaused(ofGetTimestampString("out/%Y-%m-%d"), 40, 80);
    masker.setup(1);
    image.setup("road.png");
    image.setTexturePositionY(0.5);
    transp.setup("road-transp.png");
    goingUp = true;
    directionChanged = true;
    position = 0.5;
}

void ofApp::update(){
    masker.beginLayer(0);
    {
        image.incrementTextureOffsetY(0.05);
        image.draw();
    }
    masker.endLayer(0);
    
    masker.beginMask(0);
    {
        if(ofRandom(1) > 0.6) {
            goingUp = !goingUp;
            directionChanged = true;
        }
        
        if(directionChanged) {
            alpha = 255;
            directionChanged = false;
        } else {
            alpha = 32;
        }
        position += goingUp ? 0.01 : -0.01;
        transp.setTexturePositionY(position);
        
        ofSetColor(ofColor::white, alpha);
        if(ofGetFrameNum() == 0) {
            ofSetColor(ofColor::black);
        }
        ofRect(0, 0, gif.width, gif.height);
        ofSetColor(ofColor::white);
        transp.draw();
    }
    masker.endMask(0);
}

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