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        void ofApp::setupAnim() {
    masker.setup(width, height);
    layer1 = masker.newLayer();
    layer2 = masker.newLayer();
    
    image1.setup("foil.png");
    image2.setup("foil.png");
    
    image1.setOffsetX(0);
    image1.setOffsetY(0);
    image2.setOffsetX(1);
    image2.setOffsetY(1);
    
    pos = 0;
    size = width * 0.2;
}

void ofApp::updateAnim(){
    pos+=10;
    if(pos > height * 2) {
        pos = 0;
    }
    
    masker.beginLayer(layer1);
    {
        image1.incrementOffsetX(0.01);
        image1.incrementOffsetY(0.01);
        image1.draw();
    }
    masker.endLayer(layer1);
    
    masker.beginMask(layer1);
    {
        ofBackground(ofColor::black);
        ofSetColor(ofColor::white);
        for(int x = 0; x < size; x++) {
            if(x % 2 == 0) {
                ofRect(x * size, height - pos, size, height);
            }
        }
    }
    masker.endMask(layer1);

    masker.beginLayer(layer2);
    {
        image2.incrementOffsetX(-0.01);
        image2.incrementOffsetY(-0.01);
        image2.draw();
    }
    masker.endLayer(layer2);
    
    masker.beginMask(layer2);
    {
        ofBackground(ofColor::black);
        ofSetColor(ofColor::white);
        for(int x = 0; x < size; x++) {
            if(x % 2 != 0) {
                ofRect(x * size, pos - height, size, height);
            }
        }
    }
    masker.endMask(layer2);
}

void ofApp::drawAnim() {
    ofBackground(ofColor::black);
    masker.draw();
    masker.drawOverlay();
    
    if(ofGetFrameNum() == 100) {
        renderGif();
    }
}