This pop-up list contains several different ways to map a texture.
UV - This method of mapping actually maps the texture onto the object, stretching and squeezing where necessary. Texture maps retain their relative position on the object even when the object is twisted or folded. This is the only method that does not use projection mapping, which is the process of projecting the image onto the surface.
Planar - This method pushes the texture straight through the object. The texture shows on all faces of the object, even the inside and back.
Decal - This method applies the texture to only one side of an object.
Cubic - This method applies the texture from six directions, even if the selected object isn't a cube.
Cylindrical 1 - This method wraps the texture around the object in a cylindrical fashion. If the texture is longer than the object (top and bottom), the texture smears to the center of the object on the top and bottom end caps.
Cylindrical 2 - This method wraps the texture around the object in the same cylindrical pattern as the Cylindrical mapping type does, but the aspect ratio of each pixel is retained.
Spherical - This method wraps the texture around the object in a spherical way, and then gathers the texture together at the top and the bottom poles.
