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        void ofApp::setupAnim() {
    masker.setup(width, height);
    layerId = masker.newLayer();
    
    ofDisableArbTex();
    offset.x = ofRandom(30);
    offset.y = ofRandom(30);
    movingLeft = true;
    setupImage("surface.png", &img, &tex);

    plane.set(width, height);
    plane.setPosition(halfWidth, halfHeight, 0);
    plane.setResolution(2, 2);
}

void ofApp::setupImage(string file, ofImage *img, ofTexture *tex) {
    img->loadImage(file);
    *tex = img->getTextureReference();
    tex->setTextureWrap(GL_MIRRORED_REPEAT, GL_MIRRORED_REPEAT);
}

void ofApp::drawLayer(ofTexture *tex) {
    plane.mapTexCoords(tx0, ty0, tx1, ty1);
    plane.mapTexCoords(tx1, ty1, tx0, ty0);
    tex->bind();
    plane.draw();
    tex->unbind();
}

void ofApp::updateAnim(){
    masker.beginLayer(layerId);
    ofBackground(ofColor::black);
    ofSetColor(ofColor::red);
    tx0 = offset.x + (movingLeft ? ofGetFrameNum() : -ofGetFrameNum()) * 0.0005;
    ty0 = offset.y;
    tx1 = tx0 - 0.16666667;
    ty1 = ty0 - 1;
    drawLayer(&tex);
    masker.endLayer(layerId);
    
    masker.beginMask(layerId);
    ofBackground(ofColor::black);
    for(int i = 0; i < 8; i++) {
        ofSetColor(ofColor::white, ofRandom(32));
        ofRotateZ(ofRandom(360));
        ofRect(-width*2, ofRandom(height), width*4, ofRandom(halfHeight, height));
    }
    masker.endMask(layerId);

    if(ofRandom(1) > 0.5) {
        offset.x = ofRandom(30);
        offset.y = ofRandom(30);
        movingLeft = !movingLeft;
    }
}

void ofApp::drawAnim() {
    if(ofGetFrameNum() == 0) ofBackground(ofColor::black);
    ofSetColor(ofColor::white, 40);
    drawLayer(&tex);
    masker.draw();
    if(ofGetFrameNum() == 72) {
        renderGif();
    }
}