The constants given here are for distinguishing between the choices available to the user (see menu handler). We see that the choices include selecting an image map from among two. Two are made part of this example so as to illustrate creating and naming texture objects and selecting which is used. In addition to the two image maps, the user can select among several types of geometry to which the selected image map is applied. Last, we show in this example how to make closing the program a menu choice.