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        void ofApp::setupAnim() {
    ofEnableSmoothing();
    
    for(int i = 0; i < width; i += 10) {
        for(int j = 0; j < height; j += 10) {
            shape.setupHollowArc(30, 3, 10, 180);
            shape.setBlur(1);
            shape.setPosition(ofVec3f(i + 5, j + 5, 0));
            shape.rotateZ(ofRandom(360));
            shapes.push_back(shape);
        }
    }
    
    for(int i = 0; i < shapes.size(); i++) {
        shapeSystem.add(shapes.at(i));
    }
}

void ofApp::updateAnim(){
    for(int i = 0; i < shapes.size(); i++) {
        i % 2 == 0 ?
            shapes.at(i).incrementRotateZ(12) :
            shapes.at(i).incrementRotateZ(-12);
    }
}

void ofApp::drawAnim() {
    ofBackground(0, 0, 0);
    
    ofEnableAlphaBlending();
    
    for(int i = 0; i < shapes.size(); i++) {
        shapes.at(i).setColor(ofColor::white);
    }
    shapeSystem.draw();
    
    rotateScreen(90);
    for(int i = 0; i < shapes.size(); i++) {
        shapes.at(i).setColor(ofColor(ofColor::black, 192));
    }
    shapeSystem.draw();
    
    rotateScreen(90);
    for(int i = 0; i < shapes.size(); i++) {
        shapes.at(i).setColor(ofColor(ofColor::black, 128));
    }
    shapeSystem.draw();
    
    rotateScreen(90);
    for(int i = 0; i < shapes.size(); i++) {
        shapes.at(i).setColor(ofColor(ofColor::black, 64));
    }
    shapeSystem.draw();
    
    ofDisableAlphaBlending();
    
    if(ofGetFrameNum() == 30) renderGif();
}

void ofApp::rotateScreen(float degrees) {
    ofTranslate(halfWidth, halfHeight, 0);
    ofRotate(degrees);
    ofTranslate(-halfWidth, -halfHeight, 0);
}