3D visualization is a powerful tool to increase understanding and experience of the world’s cultural heritage. However, where there is incomplete primary material on which to base visualizations there is a recognised danger that 3D models, as absolutist in their representations, can be misinterpreted as a totally accurate replica of reality. Good practice in creating digital reconstructions of non extant architecture leads to researchers meticulously documenting the process and outputs of heritage visualizations, however unless the research sources and methods are made explicit and visible, the danger of mis-reading visualized data remains.

This research describes the development of software that allows research sources, methods, and interpretation to be added as multimedia annotations to a 3D scene comprising the entire British Empire Exhibition of 1938. All real-world and digital objects are semantically described and given a spatial placement within the scene. The software is built on a CIDOC-CRM export-compatible data model and provides a novel interface which allows groups of users to collaboratively and simultaneously create annotations in an intuitive discursive visualization environment using remote tablet PCs. The development of a unique, life-size, stereo visualization of this lost architecture, with spatialised semantic annotations, will enhance engagement with and understanding of this hugely significant event in history.