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        void ofApp::setup(){
    increment = 0.0025;
    numLayers = 3;
    filename = "foil-large-transp.png";

    ofSetWindowShape(500, 500);
    gif.setupPaused(ofGetTimestampString("out/%Y-%m-%d"), 8, 56);

    masker.setup(numLayers);
    plane.setup(filename);
    for(int i = 0; i < numLayers; i++) {
        layers.push_back(plane);
        masks.push_back(plane);
    }
    reset();
}

void ofApp::reset() {
    offsetIncrements.clear();
    scaleIncrements.clear();

    for(int i = 0; i < numLayers; i++) {
        layers.at(i).setTextureScale(ofRandom(4.5, 5.5));
        layers.at(i).setTexturePosition(ofRandom(2), ofRandom(2));
        masks.at(i).setTextureScale(ofRandom(4.5, 5.5));
        masks.at(i).setTexturePosition(ofRandom(2), ofRandom(2));
        offsetIncrements.push_back(ofVec2f(ofRandom(-increment, increment), ofRandom(-increment, increment)));
        scaleIncrements.push_back(ofRandom(-increment*6, increment*6));
    }
}

void ofApp::update(){
    if(ofGetFrameNum() % 8 == 0) {
        reset();
    }
    for(int i = 0; i < numLayers; i++) {
        masker.beginLayer(i);
        {
            layers.at(i).incrementTextureOffset(offsetIncrements.at(i));
            layers.at(i).incrementTextureScale(scaleIncrements.at(i));
            layers.at(i).draw();
        }
        masker.endLayer(i);

        masker.beginMask(i);
        {
            ofBackground(ofColor::white);
            masks.at(i).incrementTextureOffset(-offsetIncrements.at(i));
            masks.at(i).incrementTextureScale(-scaleIncrements.at(i));
            masks.at(i).draw();
        }
        masker.endMask(i);
    }
}

void ofApp::draw(){
    gif.begin();
    {
        masker.draw();
    }
    gif.endAndCaptureFrame();
    gif.draw();
    masker.drawOverlay();
}