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    void ofApp::updateAnim(){
    max = ofMap(sin(ofGetFrameNum() * 0.04), -1, 1, 16, 50);
    num = ofMap(cos(ofGetFrameNum() * 0.04), -1, 1, 3000, 40);
}

void ofApp::drawAnim() {
    ofBackground(0, 0, 0);
    
    for(int i = 0; i < num; i++) {
        ofSetColor(255, 255, 255, 100);
        if(i % 2 == 0) ofSetColor(255, 0, 0, 100);
        ofRect(ofRandom(-max, width),
               ofRandom(-max, height),
               ofRandom(max),
               ofRandom(max));
    }
    
    if(ofGetFrameNum() == 150) {
        renderGif();
    }
}