However, it is also possible to map an image onto a parametric surface, such as a sphere, or below a surface plot. The warp function creates these displays by texture mapping the image.
Texture mapping is a process that maps an image onto a surface grid using interpolation.
The image may not map onto the surface in the way that you had expected. One way to modify the way the texture map appears is to change the settings of the Xdir , Ydir , and Zdir properties. For more information about texture mapping, see the reference entry for the warp function.