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        void ofApp::setupAnim() {
    ofSetWindowShape(width, height);
    masker.setup(width, height);
    
    setupBackground();
    setupMask();
    setupForeground();
}

void ofApp::setupBackground(){
    for(int i = 0; i < width; i+=40) {
        for(int j = 0; j < height; j+=40) {
            ofxShape shape;
            shape.setupFilledSquare(26);
            shape.positionX(i+10);
            shape.positionY(j+10);
            shape.setBlur(10);
            backgroundShapes.push_back(shape);
        }
    }
    
    push(&backgroundShapes, &backgroundSystems);
}

void ofApp::setupMask(){
    for(int i = -width; i < width*2; i+=40) {
        for(int j = -width; j < height*2; j+=40) {
            ofxShape shape;
            shape.setupFilledSquare(26);
            shape.positionX(i+10);
            shape.positionY(j+10);
            shape.setBlur(10);
            maskShapes.push_back(shape);
        }
    }
    
    push(&maskShapes, &maskSystems);
}

void ofApp::setupForeground(){
    for(int i = 0; i < width; i+=40) {
        for(int j = 0; j < height; j+=40) {
            ofxShape shape;
            shape.setupFilledSquare(26);
            shape.positionX(i+30);
            shape.positionY(j+30);
            shape.setBlur(10);
            foregroundShapes.push_back(shape);
        }
    }
    
    push(&foregroundShapes, &foregroundSystems);
}

void ofApp::updateAnim(){
    float scale = ofMap(sin(ofGetFrameNum() * 0.08), -1, 1, -54, 54);
    for(int i = 0; i < maskShapes.size(); i++){
        maskShapes.at(i).positionZ(scale);
    }
}

void ofApp::drawAnim() {
    masker.beginBackground();
    draw(&backgroundSystems);
    masker.endBackground();
    
    masker.beginMask();
    draw(&maskSystems);
    masker.endMask();
    
    masker.beginForeground();
    draw(&foregroundSystems);
    masker.endForeground();
    
    masker.draw();
    
    if(ofGetFrameNum() == 78) {
        renderGif();
    }
}

void ofApp::push(vector<ofxShape> *shapes, vector<ofxShapeSystem> *systems) {
    ofxShapeSystem system;
    for(int i = 0; i < shapes->size(); i++) {
        system.add(shapes->at(i));
    }
    systems->push_back(system);
}

void ofApp::draw(vector<ofxShapeSystem> *systems) {
    ofClear(0, 0, 0, 255);
    for(int i = 0; i < systems->size(); i++) {
        systems->at(i).draw();
    }
}