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        void ofApp::setupAnim() {
    maskOpacity = 255;

    for(int i = 0; i < 50; i++) {
        position.x = ofRandom(-width, width*2);
        position.y = ofRandom(-height, height*2);
        position.z = ofRandom(-400, 0);
        size = ofRandom(20, 380);
        thickness = size * 0.18;
        
        ofxShape square;
        square.setupHollowSquare(thickness, size);
        square.setPosition(position);
        square.setBlur(2);
        shapes.push_back(square);

        ofxShape ring;
        ring.setupHollowRing(60, thickness, size);
        ring.setPosition(position);
        ring.rotateY(90);
        ring.setBlur(2);
        shapes.push_back(ring);
    }
    
    for(int i = 0; i < shapes.size(); i++) {
        system.add(shapes.at(i));
    }
}

void ofApp::updateAnim(){
    float brightness = ofMap(sin(ofGetFrameNum() * 0.03), -1, 1, 0, 255);
    ofColor color = ofColor(brightness, brightness, brightness, 100);

    for(int i = 0; i < shapes.size(); i++) {
        shapes.at(i).incrementRotateX(12);
        shapes.at(i).incrementRotateY(0.8);
        shapes.at(i).incrementRotateZ(-0.77);
        shapes.at(i).incrementPositionX(4);
        shapes.at(i).incrementPositionY(-6);
        shapes.at(i).incrementPositionZ(12);
        shapes.at(i).setColor(color);
    }
}

void ofApp::drawAnim() {
    ofEnableAlphaBlending();

    //Swallow the trails
    ofSetColor(0, 0, 0, 30);
    ofRect(0, 0, width, height);

    system.draw();

    //Fade in
    if(maskOpacity > 0 && ofGetFrameNum() < 20) {
        ofSetColor(0, 0, 0, maskOpacity);
        ofRect(0, 0, width, height);
        maskOpacity -= 25;
    }

    //Fade out
    if(ofGetFrameNum() > 20) {
        ofSetColor(0, 0, 0, maskOpacity);
        ofRect(0, 0, width, height);
        maskOpacity += 25;
    }

    ofDisableAlphaBlending();

    if(maskOpacity > 255) {
        renderGif();
    }
}