A virtual 3D model on a screen has the potential for a site to be viewed, explored and analysed from every angle, and the data seamlessly integrated into computer aided design systems. Such models are regularly used by surveyors, architects, archaeologists and conservationists for specific tasks often requiring specialised software to process, manipulate or augment the raw model. They have a further drawback in that they can often be used by one person at a time, showing one