writeSurfacePatches_(node, polygon, objectStack) {
    const child = createElementNS(node.namespaceURI, 'PolygonPatch');
    node.appendChild(child);
    this.writeSurfaceOrPolygon(child, polygon, objectStack);
  }
@param {Element} node Node.
@param {import("../geom/Polygon.js").default} polygon Polygon geometry.
@param {Array<*>} objectStack Node stack.
@private