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        void ofApp::setup(){
    increment = 0.02;
    numLayers = 3;
    filename = "condensation-transp2.png";

    ofSetWindowShape(500, 500);
    gif.setupPaused(ofGetTimestampString("out/%Y-%m-%d"), 240, 280);
    gif.fadeInOut(8, 2, ofColor::white, 1);

    masker.setup(3);
    plane.setup(filename);
    plane.setTexturePositionY(0.5);
    for(int i = 0; i < numLayers; i++) {
        layers.push_back(plane);
        masks.push_back(plane);
    }
}

void ofApp::update(){
    for(int i = 0; i < numLayers; i++) {
        masker.beginLayer(i);
        {
            if(i == 0) {
                layers.at(i).incrementTextureOffsetY(-increment);
                layers.at(i).incrementTextureScale(-increment);
            }
            if(i == 1) {
                layers.at(i).incrementTextureOffsetY(increment);
                layers.at(i).incrementTextureScale(increment);
            }
            if(i == 2) {
                layers.at(i).incrementTextureOffsetX(increment);
                layers.at(i).incrementTextureScale(-increment);
            }
            layers.at(i).draw();
        }
        masker.endLayer(i);

        masker.beginMask(i);
        {
            ofBackground(ofColor::white);
            ofSetColor(ofColor::white);
            if(i == 0) {
                masks.at(i).incrementTextureOffsetY(-increment);
                masks.at(i).incrementTextureScale(-increment*0.5);
            }
            if(i == 1) {
                masks.at(i).incrementTextureOffsetY(increment);
                masks.at(i).incrementTextureScale(increment*0.5);
            }
            if(i == 2) {
                masks.at(i).incrementTextureOffsetX(-increment);
                masks.at(i).incrementTextureScale(increment*0.5);
            }
            masks.at(i).draw();
        }
        masker.endMask(i);
    }
}

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