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        void ofApp::setupAnim() {
    ofDisableArbTex();
    setupImage("surface.png", &img, &tex);

    plane.setResolution(2, 2);
    
    offset.set(1, 0.04);
}

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) {
    tx0 = offset.x;
    ty0 = offset.y;
    tx1 = tx0 - 0.66666668;
    ty1 = ty0 - 1;
    plane.setPosition(halfWidth, halfHeight, 0);
    plane.set(width, height);
    plane.mapTexCoords(tx0, ty0, tx1, ty1);
    plane.mapTexCoords(tx1, ty1, tx0, ty0);
    tex->bind();
    plane.draw();
    tex->unbind();
}

void ofApp::drawLayer2(ofTexture *tex) {
    tx0 = offset.x - (0.66666668 * 0.5);
    ty0 = offset.y -0.5;
    tx1 = tx0 - (0.66666668 * 0.5);
    ty1 = ty0 - 0.5;
    plane.setPosition(halfWidth*0.5, halfHeight*0.5, 0);
    plane.set(halfWidth, halfHeight);
    plane.mapTexCoords(tx0, ty0, tx1, ty1);
    plane.mapTexCoords(tx1, ty1, tx0, ty0);
    tex->bind();
    plane.draw();
    tex->unbind();
}

void ofApp::rotateScreen(float degrees, int amount) {
    ofTranslate(amount, amount, 0);
    ofRotate(degrees);
    ofTranslate(-amount, -amount, 0);
}

void ofApp::updateAnim(){
    offset.x += 0.02;
}

void ofApp::drawAnim() {
    ofBackground(ofColor::black);
    ofSetColor(ofColor::wheat);
    
    
    offset.y = 0.02;
    drawLayer(&tex);
    rotateScreen(90, halfWidth);
    drawLayer(&tex);
    rotateScreen(90, halfHeight);
    drawLayer(&tex);
    rotateScreen(90, halfWidth);
    drawLayer(&tex);
    rotateScreen(90, halfHeight);
    drawLayer2(&tex); //cover up

    if(ofGetFrameNum() == 100) {
        renderGif();
    }
}