APPLYING THE REAL TIME SHADOWING METHOD FOR CREATING SOFT SHADOWS IN OPENGL

This paper presents a technique for rapidly generating and rendering of soft shadows on the scene. The method has the advantage of real-time creating of shadows which look more realistic than hard shadows and have high quality, also it has not high demands in resources. The main idea is to replace a complex light source with a collection of multiple point sources of light in order to decrease rendering time. The mathematic model, experiments, and comparison with similar techniques are given and described.

Controlled shadow in photography : the development of a technique for child portraiture

This research deals with both the cultural and technical aspects of the use of controlled shadow in child portraiture. This study was contextualised by setting it in a theoretical framework of visual culture, and by exploring the connotations of shadow in western culture. The theoretical framework provided by visual culture suggested that the way in which shadow is interpreted is dependent on the context in which it is set, and, in the context of child portraiture in particular, shadow tends to be avoided in commercial shoots. As the commercial viability of photography depends on the public being comfortable with the images produced, child photographs are usually staged or touched up to ensure that no sinister or foreboding connotations might be conveyed by shadow. While the use of harsh shadow is generally not aesthetically pleasing, and obscures the very lineaments which personalise and animate images, it was the contention of this study that use of controlled shadow might add depth and character to portraiture, and has the potential to create aesthetically pleasing effects in child photography. The empirical work explored both the cultural and technical aspects of photography. The cultural aspects, relating to the potentially undesirable aspects of photography, were explored in questionnaires and surveys carried out with groups of practising professional photographers and parents of young children. The technical aspects were explored by developing a technique for achieving pleasing aesthetic effects in child portraiture by use of controlled shadow, using the soft shadows cast by natural objects or those associated with play. The results suggest that photographers would be willing to use a technique such as that developed, provided that the results were acceptable to their clients, and thus commercially viable; the parent responses suggest that clients would find child portraits with controlled shadow aesthetically pleasing.