Methods and apparatus, including computer program products, for rendering objects. According to one aspect, a program has instructions to receive at run time, in a render manager, a request for rendering a first object and an output destination for rendering the first object, which is an object in a graph of objects; instructions to select a first renderer appropriate to the object and the output destination; and instructions to invoke the selected first renderer to render the first object. Advantageous implementations include instructions in the selected first renderer to call back the render manager when the selected first renderer encounters a second object to be rendered in rendering the first object, where the second object cannot be rendered by the selected renderer; and instructions in the render manager to select and use a second renderer to render the second object.