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Ray‐casting techniques provide a very general framework in which many problems can be solved in a much easier way than with conventional methods. This is particularly true for the illumination model when a high level of realism is required. Another interesting feature of ray‐casting is its ability to display a wide class of algebraic surfaces with a minimum of approximation. Both aspects are developed in this paper where a full lighting model, based on a theoretical approach, is presented. Then, an algorithm for the display of surfaces of revolution is described. Computation time is the major drawback of ray‐tracing. Special purpose parallel processors seem to offer a good price/performance ratio compared to the use of supercomputers.

This paper examines how an augmented reality guide can enrich museum visits. The results we obtained form an experiment conducted for a museum exhibit. An ergonomic experimentation has been conducted where real visitors use our augmented reality prototype. We collected feedback from these users, helping us to identify the usefulness of AR for museum visits or appreciation of art work. We conclude this paper by proposing some implications about the future usage of augmented reality in a museum context.

Abstract