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3D reconstruction technologies have gained importance as tools for the research and visualization of no longer extant historic objectsduring the last decade. Within such reconstruction processes, visual media assumes several important roles: as the most importantsources especially for a reconstruction of no longer extant objects, as a tool for communication and cooperation within theproduction process, as well as for a communication and visualization of results. While there are many discourses about theoreticalissues of depiction as sources and as visualization outcomes of such projects, there is no systematic research about the importance ofdepiction during a 3D reconstruction process and based on empirical findings. Moreover, from a methodological perspective, itwould be necessary to understand which role visual media plays during the production process and how it is affected by disciplinaryboundaries and challenges specific to historic topics. Research includes an analysis of published work and case studies investigatingreconstruction projects. This study uses methods taken from social sciences to gain a grounded view of how production processeswould take place in practice and which functions and roles images would play within them. For the investigation of these topics, acontent analysis of 452 conference proceedings and journal articles related to 3D reconstruction modeling in the field of humanitieshas been completed. Most of the projects described in those publications dealt with data acquisition and model building for existingobjects. Only a small number of projects focused on structures that no longer or never existed physically. Especially that type ofproject seems to be interesting for a study of the importance of pictures as sources and as tools for interdisciplinary cooperationduring the production process. In the course of the examination the authors of this paper applied a qualitative content analysis for asample of 26 previously published project reports to depict strategies and types and three case studies of 3D reconstruction projectsto evaluate evolutionary processes during such projects. The research showed that reconstructions of no longer existing historicstructures are most commonly used for presentation or research purposes of large buildings or city models. Additionally, they areoften realized by interdisciplinary workgroups using images as the most important source for reconstruction as far as importantmedia for communication and quality control during the reconstruction process

WORKFLOWS AND THE ROLE OF IMAGES FOR VIRTUAL 3D RECONSTRUCTION OF NO LONGER EXTANT HISTORIC OBJECTS