20|AULA cd option “edit geometry of the place” it decomposes in lines and vertices. The latter can be moved with the mouse freely on the plane, with the advantage that the program detects any cross of lines or vertices in the imported drawing, and it places itself on it without having to indicate coordinates or numerical measurements The Calculux Indoor program does not import external files. It is designed exclusively for spaces of rectangular and two dimensional base, and it mainly specializes in lighting calculus of sport, office and work spaces. It also allows you to work in pre-defined spaces that can be found under the menu “Data”. As to the introduction of materials and colors, in Dialux there is a wide range of colors and a limited scope of textures applicable to the facings. From the edit box we can assign to any facing or object in the space a basic color, a degree of reflection, transparency, roughness, mirror effect, but we will only be giving the object a color similar to the material, not a realistic texture. The best thing to do is to access the list of general colors and materials, classified by types and areas of application, and let them be the ones you “drag” towards the desired facing or object. In Relux we can access the pop- up window of information and characteristics of an element by doing double click on it. On this window we can give the object a base color and a percentage % of reflection or you can access a menu called “Material/texture”. On it you will find a list of base colors where you can modify the proportions of red, green and blue as well as their “specularity and roughness”. You can add new colors and textures. There is also an option called “Search” that opens a Windows explorer window where you can look for and select any texture or image that we have in the computer. Once a texture is selected you can modify its levels of color, shine, contrast, proportions and scale. To sum it up, in Dialux we have a wide selection of colors, pretty and realistic, that allows you to associate them rapidly to the facings saving work time; on the other hand there is limited range of textures that it does not allow modifications of color, contrast, shine or saturation; only of proportion and scale. In Relux there are few pre-defined colors, you have to create them yourself, but the program offers an extensive range of textures with the option of modifying many factors on them. It also has the option of selecting other textures that are in the computer, apart from the program. As to natural light, Dialux and Relux allow calculations and representations of natural light individually or with artificial light. Calculux allows only the calculations of artificial lighting. Dialux is more accurate in natural lighting calculations and in options when introducing it, allowing you to work with different “light scenarios”. In each one of them, the conditions of natural and artificial lighting can change and you can insert and calculate as many as you want. In every light scenario you can insert control groups of luminaries with specific and different characteristics than the rest. To each scenario you can assign a name, indicate if they are emergency lights or not, Perspectiva en Relux. Perspectiva en Dialux.