Optimal methodes for 3D modeling of devastated arhitectural objects

Abstract

In this research we define optimal methods for 3D representation of devastated architectural objects. Recording devastated objects consists of three phases: recording existing remains, recording collapsed parts of objects and combining these results into a complete model. Optimal method for recording existing remains depends on the specific site conditions. Criteria for choosing optimal method can be divided into project criteria, economic criteria and object criteria. Project criteria relays on required type of representation which includes data quantity, quality and complexity. Economic criteria searches for method with least time and financial demands. Object criteria analyze if the defined type of objects is suitable for specific method. After complete analysis of numerous devastated sacral objects, it is determined that among manual measuring, photogrammetry and laser scanning, the terrestrial photogrammetry is the best method. For recording of former object appearance, old photograph restitution is obviously the optimal method. Combining photo restitution, terrestrial photogrammetry and modeling, virtual reconstructions of partly collapsed objects are created. Virtual reconstruction of devastated objects is a 3D model representing object as it looked before any damage. Danube area of Vojvodina was entirely researched as case study. All catholic churches and chapels built in Vojvodina in 18th, 19thand first half of 20stcentury were recorded. For devastated objects virtual reconstructions were made. These models relay on 3D photogrammetry models of present remains combined with object volume data on old photographs or photographs of hardly approachable parts. Several typical object representatives are presented in this paper.