A method for texturing a substrate includes 3-D printing a pattern onto a substrate to form a texture. The pattern has a root mean square roughness between 40 to 1000 microns and an autocorrelation function greater than 0.5 for distances less than 50 microns.

The present disclosure provides a suitable method for producing a headlight lens for a vehicle headlight, for example for a motor-vehicle headlight, wherein the headlight lens comprises an integral body made of glass, wherein the integral body comprises at least one light tunnel and one light-passage section having at least one optically active light exit surface, wherein the light tunnel comprises at least one light entry surface and, with a bend, transitions into the light-passage section in order to image the bend as a bright-dark-boundary by means of light directed into the light entry surface.

An appearance decoration member includes a texture surface. The texture surface is divided into multiple partition units arranged in multiple rows and multiple columns, and each of the multiple partition units has a sub-texture. An included angle of the sub-texture relative to a row direction is defined as a texture angle, where texture angles of two adjacent sub-textures in a first row are different, and texture angles of sub-textures in each of the multiple columns form an arithmetic progression along a column direction.

A mold and a method for fabricating a lens are provided, for shaping the lens. The mold includes a first mold and a second mold matching the first mold. The first mold includes a first mold body, multiple first molding parts with an arc-shaped surface formed by a side of the first mold body close to the second mold, annular second molding parts respectively formed by outer peripherals of the first molding part and annular first balancing rings formed by outer peripherals of the second molding parts. The second mold includes a second mold body, multiple annular third molding parts formed on a side of the second mold body close to the first mold, annular fourth molding parts respectively formed around the outer peripherals of the third molding parts and annular second balancing rings formed by the outer peripherals of the fourth molding parts.