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        void ofApp::setupAnim() {
    numShapes = 4;
    spacing = width / numShapes; //20
    offset = spacing * 0.5;      //10
    
    for(int x = 0; x < numShapes; x++) {
        for(int y = 0; y < numShapes; y++) {
            for(int size = spacing - 2; size > 0; size-=4) {
                ofxShape shape;
                shape.setupHollowSquare(1, size);
                shape.positionX(x * spacing + offset);
                shape.positionY(y * spacing + offset);
                shape.positionZ(100);
                shapes.push_back(shape);
            }
        }
    }
    
    for(int i = 0; i < shapes.size(); i++) {
        system.add(shapes.at(i));
    }
}

void ofApp::updateAnim(){
    for(int i = 0; i < shapes.size(); i++) {
        if(i % 2 == 0) {
            shapes.at(i).incrementRotateZ(1);
        } else {
            shapes.at(i).incrementRotateZ(-1);
        }
    }
}

void ofApp::drawAnim() {
    ofBackground(0, 0, 0);
    system.draw();
    
    if(ofGetFrameNum() == 90) {
        renderGif();
    }
}