Optical solid body made of a solid transparent material and method for producing same

An optical solid body made of a solid transparent material for use in a light module of a motor vehicle lighting device, the optical solid body comprising a light coupling-in portion, via which light from a light source of the motor vehicle lighting device can be coupled into the optical solid body, and a light coupling-out portion, via which at least a portion of the light coupled into the optical solid body is coupled out of the optical solid body, so that the coupled-out light serves to generate at least a portion of a light distribution of the motor vehicle lighting device in front of the motor vehicle, and the optical solid body further comprises an optically active layer arranged in the beam path between the coupling-in portion and the coupling-out portion, which layer is designed to modify incident light, wherein the optically active layer comprises at least one film and is arranged inside the optical solid body, wherein, the at least one film has a three-dimensional shape, configuration and/or structure and is overmolded on at least one of its surfaces with the transparent material of the optical solid body.