In the technique of vector lighting, one presets the lighting in the computer model and then through a set of commands assigns the lighting qualities to each vector. 5a Another type of technique used to recreate lighting within a vR simulation is called vector lighting. In this technique one again presets the lighting in the computer model and then through a set of commands assigns the lighting qualities to each vector. All objects in computer models are made up of various polygons, typically triangles, and color and brightness values can be added to each corner of each polygon, its vectors. Then after the surfaces are textured, adding wood grain or stone or marble for example, the vectors inform how brightly or dimly that texture should be rendered at each corner. Once again, most professional modeling applications have this feature. Unfortunately, the vector lighting technique has a tendency to create jagged looking pools of light and cast shadows. In order to smooth out this jagged quality one must add more and more vertices. For example, a simple box that would be made up of basic triangles will have to be divided and subdivided until it is made up of hundreds of triangles so the detailed lighting 5a 6 S P R I N G 2010 theatre design & technology 43