Presentation of Research Paper "Semantic-driven Visualization Techniques for Interactive Exploration of 3D Indoor Models" at 23rd International Conference on Information Visualisation (IV 2019) in Paris, France.

1. Semantic-driven Visualization Techniques
for Interactive Exploration of 3D Indoor Models
Alessandro Florio1, Matthias Trapp2, Jürgen Döllner2
1University of Trento, now at TOL GmbH, Bolzano, Italy
2Hasso Plattner Institute, Faculty of Digital Engineering, University of Potsdam, Germany
23rd International Conference Information Visualisation
2 - 5 July 2019 ● University of Paris 13 ● Paris ● France

2. Motivation
Observations:
▪ Constructions designed using CAD software
▪ Increased availability of 3D indoor models
▪ Used during phases construction’s life cycle
Applications:
▪ Facility management
▪ Disaster Management
Challenges:
▪ Elements-of-interest often occluded
▪ Filtering techniques can facilitate exploration
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Usage of BIMs through a building’s life cycle.

3. Motivation
Observations:
▪ Constructions designed using CAD software
▪ Increased availability of 3D indoor models
▪ Used during phases construction’s life cycle
Applications:
▪ Facility management
▪ Disaster Management
Challenges:
▪ Elements-of-interest often occluded
▪ Filtering techniques can facilitate exploration
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Indoor models in Google Maps.

4. Industry Foundation Classes (IFC)
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Synopsis:
▪ Open, international standardized
specification for BIM data
▪ Exchanged between participants
in buildings’ lifecycle
▪ Elements with geometry and semantics in an
object-based hierarchy
Exemplary element semantics:
▪ IfcRoof, IfcWall, …
▪ IfcSite, IfcSpace, …
▪ IfcBeam, IfcColumn, …
Exemplary graph-representation of an IFC data set.

5. Basic Data Structure
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Scene-graph with node indexing.
Exemplary graph-representation of an IFC data set.
Parsing &
Triangulation

6. Automatic Level-of-Detail Generation
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Hagedorn et al. „Towards an indoor level-of-detail model for route visualization“
Mobile Data Management: Systems, Services and Middleware, 2009. MDM'09. IEEE, 2009.
LOD-0
LOD-1
LOD-2
LOD-3

7. Overview of Visualization Techniques
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Cut-away Views Level-of-Detail Visualization Ghosted Views
Combinations of Techniques Object Highlighting
Exploded Views

8. Cut-away View Technique
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Omit rendering of occluding geometry
can be configured per-element:

9. Ghosted-View Technique
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Transparency rendering of occluding
geometry:

10. Element/Object Highlighting
▪ All elements rendered using ghosted view
▪ Selected element rendered opaque
▪ Multiple selection possible
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11. Manual Exploded-View Technique
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12. View-dependent Exploded Views
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13. View-dependent Exploded-View Technique
∀ frame {
bool overlap = checkBBs();
if (overlap) {
while (overlap) {
zOffset += DELTA;
overlap = checkBBs();
}
} else {
while (!overlap) {
zOffset -= DELTA;
overlap = checkBBs();
}
}
}
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14. Exploded Views for Multi-Floor Buildings
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Translation matrices are configured and stored per-floor.

15. Combination of Visualization Techniques
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Examples for simultaneous combination of previous techniques with exploded views.
Ghosted Views Cut-away Views + Level-of-Detail
Ghosted Views + Cut-away Views

16. Evaluation of Run-time Performance
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Test Machine: 3.1 GHz Intel® Core™ i5-2400 | 8GB RAM | NVIDIA GeForce GT630 2GB VRAM

17. Wrap Up
Semantic-based visualization techniques:
▪ Application and configuration based on element types
▪ Facilitate perception of important scene elements
▪ Maintain reference objects as context to spatially relate
Interactive rendering techniques:
▪ Configuration settings can be configured at runtime
▪ View-dependent parameterization
▪ Sufficient rendering performance
Basic tool for effective exploration of 3D indoor models
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Exploded view of multi-floor building
combined with different LOD.

18. Thank you for your Attention
Contact Information:
▪ Matthias Trapp
matthias.trapp@hpi.de
▪ Jürgen Döllner
juergen.doellner@hpi.de
Computer Graphics System Group www.hpi3d.de

19. Complete Video
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