Textures and UVs Textures are pixel maps, usually image files,
you use to control surface values such as color, opacity,
displacement, and so on. To map textures to surfaces, Houdini
must know which parts of the pixel map should appear on which
parts of the surface. You do this by putting UV coordinates
attributes on the surface, which map to pixels in the texture.
In Houdini, you need to add UVs to all surface types. NURBS
surfaces do not automatically have UV coordinates.