Strahlverfolgung(A sophisticated and complex method of producing high-quality computer graphics. Ray tracing calculates the color and intensity of each pixel in an image by tracing single rays of light backward and determining how they were affected on their way from a defined source of light illuminating the objects in the image. Ray tracing is demanding in terms of processing capability because the computer must account for reflection, refraction, and absorption of individual rays, as well as for the brightness, transparency level, and reflectivity of each object and the positions of the viewer and the light source)
Durchrechnung(this means determining the paths of various rays as they pass through the elements of an optical system, with the aim of bringing all the rays from an object point as close as possible to a point intersection in the image plane)
