1. HIGH RESOLUTION TEXTURED MODELS FOR ENGINEERING APPLICATIONS
Laboratory of Photogrammetry
National Technical University of Athens
Greece

2. Introduction
Object of study:
The monument of Zalongon
Problem identification:
Creation of a high resolution textured 3D model of the monument and assistance in the restoration of the destroyed parts
3. Objectives
Presentation of the basic steps and considerations in photogrammetric texture modeling
Investigation of the usability of 3D textured models in engineering applications in general
Interaction with the 3D model in order to assist the restoration process
4. The monument of Zalongon
Location: NW of Greece
Built: 1950s
Designers:
PatroklosKarandinos and
George Zongolopoulos
Length: 17.5m
Height: 12.5m
5. Equipment and Software
Equipment
CYRAX 2500 Laser scanner
Two total stations: TOPOCON GPT7003i and PENTAX R323NX
A 10MP digital camera: CANON MARK II
Software
Geodetic Adjustment: Tachimetria
CAD: AutoCAD, Rhinoceros
Photogrammetric: Image Master, Image Station
3D data processing: Geomagic, Cyclone, XYZRGB, GSI
Image processing: Photoshop
Scripting: Matlab
6. Data Acquired
12 nodes established for the geodetic network
761points were measured
148 points for the survey of the surrounding area
327 control points
144 points of detail and
99 points for a horizontal section near the basis
16 scans
9 scanner setups
16 reflective targets
239photographs
7. Conventional 2D products
8. 3D texture modeling workflow
Point cloud
registration
3D transformation to Local Reference System
3D Surfacing
Correction of the polygonal model
3D Model
Camera Calibration
Bundle Adjustment
Image Orientation
Texture Mapping
GCPs and TP
measurement
Texture Blending
VRML editing
Final 3D Model
9. Problems in the texturing process
Occlusions
Shadows
Non-orientable images
Streched areas
Gaps
Interoperability issues
10. Example results
11. Interaction with 3D textured models
Difficulty in the presentation and interaction with high polygonal textured models
Most freeware provide little or no functionality that enables interaction
High polygonal models are efficiently handled only by commercial software
Most engineering applications are facilitated mainly by CAD or CAD-like information whereby color is difficult to retain
12. Digital restoration of the monument
ORIGINAL
RECONSTRUCTED
13. Monument record material
14. Photogrammetric processing
15. Surface modeling
16. Surface modeling
17. Surface reconstruction
18. Creation of a 1:5 scaled model
19. Scanning and registration
20. 3D surface integration
21. Final 3D model
22. Final textured 3D model
23. Conclusions
The production of high polygon textured 3D models is still a challenging process
The level of interaction with high-poly textured models through freeware is quite low
Engineering applications require CAD or CAD-like data whereby it is still difficult to retain and take advantage of the color
24. Thank you for your attention