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        void ofApp::setupAnim() {
    shapeSystem.setup();
    shape1.setupGradientSquare(halfWidth*0.15, halfWidth*0.85);
    shape2.setupGradientSquare(halfWidth*0.15, halfWidth*0.85);
    shape3.setupGradientSquare(halfWidth*0.15, halfWidth*0.85);
    shape4.setupGradientSquare(halfWidth*0.15, halfWidth*0.85);

    shape1.setPosition(halfWidth*0.5, halfHeight*0.5);
    shapeSystem.add(shape1);
    
    shape2.setPosition(halfWidth*0.5+halfWidth, halfHeight*0.5);
    shapeSystem.add(shape2);
    
    shape3.setPosition(halfWidth*0.5, halfHeight*0.5+halfHeight);
    shapeSystem.add(shape3);
    
    shape4.setPosition(halfWidth*0.5+halfHeight, halfHeight*0.5+halfHeight);
    shapeSystem.add(shape4);
    
    masker.setup(width, height);
    layer1 = masker.newLayer();
    layer2 = masker.newLayer();
    
    ofDisableArbTex();
    offset = ofRandom(3);
    setupImage("foil.png", &img1, &tex1);
    setupImage("glass.png", &img2, &tex2);

    plane.set(width, height);
    plane.setPosition(halfWidth, halfHeight, 0);
    plane.setResolution(2, 2);
}

void ofApp::setupImage(string file, ofImage *img, ofTexture *tex) {
    img->loadImage(file);
    *tex = img->getTextureReference();
    tex->setTextureWrap(GL_MIRRORED_REPEAT, GL_MIRRORED_REPEAT);
}

void ofApp::drawLayer(ofTexture *tex) {
    plane.mapTexCoords(tx0, ty0, tx1, ty1);
    plane.mapTexCoords(tx1, ty1, tx0, ty0);
    tex->bind();
    plane.draw();
    tex->unbind();
}

void ofApp::updateAnim(){
    masker.beginLayer(layer1);
    if(ofRandom(1) > 0.4) ofBackground(ofColor::black);
    ofSetColor(ofColor::white);
    tx0 = -ofGetFrameNum() * 0.00006 + offset + ofRandom(-0.09, 0.09);
    ty0 = ofGetFrameNum() * 0.005;
    tx1 = tx0 - 1;
    ty1 = ty0 - 0.25;
    drawLayer(&tex1);
    masker.endLayer(layer1);
    
    masker.beginMask(layer1);
    ofBackground(ofColor::black);
    if(ofGetFrameNum() == 0 || ofRandom(1) > 0.2) {
        ofSetColor(ofColor::white, 32);
        for(int i = 0; i < 30; i++) {
            ofTriangle(ofRandom(-width, width*2), ofRandom(-height, height*2),
                       ofRandom(-width, width*2), ofRandom(-height, height*2),
                       ofRandom(-width, width*2), ofRandom(-height, height*2));
        }
    } else if(ofRandom(1) > 0.15) {
        offset = ofRandom(3);
    }
    masker.endMask(layer1);
    
    masker.beginMask(layer2);
    if(ofRandom(1) > 0.4) ofBackground(ofColor::black);
    ofSetColor(ofColor::white);
    
    tx0 = ofGetFrameNum() * 0.00006 + offset;
    tx1 = tx0 - 1;
    
    ofTranslate(-halfWidth, -halfHeight, 0);
    drawLayer(&tex1);
    masker.drawLayer(layer1);
    
    ofTranslate(width, 0, 0);
    drawLayer(&tex1);
    masker.drawLayer(layer1);
    
    ofTranslate(0, height, 0);
    drawLayer(&tex1);
    masker.drawLayer(layer1);
    
    ofTranslate(-width, 0, 0);
    drawLayer(&tex1);
    masker.drawLayer(layer1);
    
    ofTranslate(halfWidth, -halfHeight, 0);
    shapeSystem.draw();
    masker.endMask(layer2);

    masker.beginLayer(layer2);
    ofSetColor(ofColor::white, 32);
    tx0 = ofGetFrameNum() * 0.005;
    ty0 = -ofGetFrameNum() * 0.00006 + offset + ofRandom(-0.09, 0.09);
    tx1 = tx0 - 0.25;
    ty1 = ty0 - 1;
    drawLayer(&tex2);
    masker.endLayer(layer2);
}

void ofApp::drawAnim() {
    ofBackground(ofColor::black);
    
    masker.draw();
    
    if(ofGetFrameNum() == 72) {
        renderGif();
    }
}