The urban environment is defined as the interaction between the city's morphological characteristics and its physical behaviour based on human interpretation. Contemporary psychology emphasizes the relation between perception and action and confirms that perception can be enhanced by receptor's motion. Basing this study on these principles, it is assumed that virtual reality techniques bring both immersion and interaction to static computer generated images and they can be used to study sunlight effects as well as daylight ambience. This paper shows the methodology of sunlight effects'analysis of both real and virtual worlds and builds a framework for a comparison.