Ray tracing is a rendering method based on global illumination for use in 3D applications to obtain a real image models. The application is available in computer games, special effects, medicine, interior and exterior design, and various simulations, advanced engineering and in all kinds of computer graphics. Ray tracing uses mathematical algorithms and physical background of for getting the real picture. Rays of light are calculated from the viewer to the source of light. Its disadvantage is that it is relatively slow and therefore hard to find applications where higher speed is required (eg video games). There are several types of programs for 3D modeling and it is important for the user to know the domain, ie he must know what is expected as the result in manipulation of certain attributes. The aim of this paper is to describe the ray tracing algorithm, explain how it works and define the settings required to achieve a real image scene. For example, the program will use Autodesk Maya 2011 and V-Ray plugin. In addition to practical work in real rendering interiors, will be defined and the various settings that were used, and mathematical functions that are used in the background of the algorithm.