1. II - UFRGS Current Projects at the Computer Graphics Group/UFRGS Isabel Harb Manssour February, 2000

2. II - UFRGS Summary 1. Location 2. The University 3. CG Group overview 4. Projects 5. GeoVis 6. RenderVox 7. VPat

3. II - UFRGS 1. Location

4. II - UFRGS Porto Alegre F Territory: 470,25 km 2 F Population: ± 1,286.251 F Climate: Subtropical wet with four well-defined seasons 1. Location F Higher education: 4 large universities and several small colleges (more than 50K students)

5. II - UFRGS 2. The University UFRGS ( Federal University of Rio Grande do Sul ) Created in 1895 One of the five biggest universities in Brazil ± 2278 faculty members Students: ± 25286 ( undergraduate and graduate )

6. II - UFRGS 2. The University Informatics Institute F Teaching and research since 1968 F Established as an Institute in 1989 F Departments Applied Computing Theoretical Computing

7. II - UFRGS F Faculty 69 professors (INPG, Grenoble; Univ. Newcastle, UK; Karslruhe and Stuttgart, Germany; Stanford USA; Coimbra, Portugal; Univ. Louvain, Belgium; etc.) Students: 700 undergraduate level + 270 graduate level F Courses at graduate level M.Sc. in Computer Science Ph.D. in Computer Science Professional education 2. The University

8. II - UFRGS F Research areas Computer Architecture/Parallel Processing Microelectronics/Digital Systems Data Base Systems Fault Tolerance Software Engineering Theoretical Computer Science Computer Graphics and Image processing Artificial Intelligence Computational Mathematics Computer Networks/Communication 2. The University

9. II - UFRGS F Operational Infra-structure Local network ~ more than 300 computers for students ~ almost 100 computers for professors and staff Equipment ~ PCs ~ SUN workstations and X terminals Library ~ 13,000 items 2. The University

10. II - UFRGS 3. CG Group Overview Started in 1978 Research in the 90's F Rendering and animation F Scientific visualization Meteorological data Geological data Medical images (volume) F Image processing applications

11. II - UFRGS People F 4 Professors Anatólio Laschuk Carla Maria Dal Sasso Freitas Jacob Scharcanski Sílvia Delgado Olabarriaga F 1 Research Assistant Luciana Porcher Nedel 3. CG Group Overview

12. II - UFRGS F 5 Ph.D. Students Image processing Human-computer interaction Medical volume data visualization Information visualization F 18 M.Sc. Students 2 in image processing 5 in information visualization 1 in scientific visualization (meteorological data) 7 in medical data visualization 3 in rendering 3. CG Group Overview

13. II - UFRGS AVICC ( Visualization in Scientific Computing Environment ) F Main goal Build interactive tools to support the analysis of scientific data F Specific activities GeoVis - a set of interactive visualization tools based on VTK Pytonissa - visual language for aiding weather forecast activities; extends Vis-5D F Supported by CNPq and CAPES/Brazil 4. Projects

14. II - UFRGS F Goals Generation of virtual human models (virtual patients) to use in medical applications such as simulation of surgery and training Movement simulation Development of a framework to guarantee software reuse Integration of the existing tools F Specific activities (next part of this talk) F Supported by CNPq, CAPES and Fapergs/Brazil 4. Projects VPat ( Visualization and interaction with Virtual Patients )

15. II - UFRGS 5. GeoVis Goals F Specific tools to support geologists in the visual data analysis process F Academic use F Deals with scattered well samples only

16. II - UFRGS General characteristics F GeoVis is an integrated environment: database system, interpolation and visualization modules F Visualization based on VTK F 3D surfaces are obtained by interpolating sample points F GeoVis three-dimensional model visualization provides reference points (wells) and allows interaction 5. GeoVis

17. II - UFRGS F Visualization of layers 1 and 2 of characteristic Marcos de Inundação, grid dimension 30 x 30, layer 1 in wireframe Examples Karen Basso, 1999 5. GeoVis

18. II - UFRGS F Visualization of layer 1 of characteristic Marcos de Inundação, and Isolita attribute. Karen Basso, 1999 5. GeoVis

19. II - UFRGS F Isocontour map for attribute Percentualde Areia, in layer 1 of Marcos de Inundação Karen Basso, 1999 5. GeoVis

20. II - UFRGS 6. RenderVox Interactive volume visualization of medical images (Ray-Casting) Available tools F Navigation through the slices data set F Cut planes F Cut volume/ subvolume F Hybrid (geometry and volume) visualization F Multimodal visualization

21. II - UFRGS Camera control and slice visualization (Marcelo Silva, 1999) 6. RendexVox

22. II - UFRGS Interactive interface (Marcelo Silva, 1998/2000) 6. RendexVox

23. II - UFRGS MRI of the head (Marcelo Silva, 1998) 6. RendexVox

24. II - UFRGS (Marcelo Silva, 1998) 6. RendexVox Transparency levels using classification tables

25. II - UFRGS (Marcelo Silva, 1998/1999) 6. RendexVox Cutting with planes

26. II - UFRGS (Marcelo Silva, 1998/1999) 6. RendexVox Cutting with volumes

27. II - UFRGS Cutting with non-planar tools Cutting with planes and volumes (Marcelo Silva, 1998/1999) 6. RendexVox (Marcelo Silva, 1998/1999)

28. II - UFRGS Hybrid rendering (geometric models and volume) (Marcelo Silva, 2000) 6. RenderVox

29. II - UFRGS 7. VPat ( Visualization and interaction with Virtual Patients ) Activities F Volume visualization F 3D reconstruction of the human parts from real data F Motion simulation and body deformation (anatomic simulation of human bodies) F Other

30. II - UFRGS 7. VPat Activities F Volume visualization RenderVox improvement and conversion to the VPat framework Collaborative visualization Multimodal visualization F 3D reconstruction of the human parts from real data F Motion simulation and body deformation (anatomic simulation of human bodies) F Other

31. II - UFRGS 7. VPat Multimodal visualization (MRI and PET) Data obtained from different patients No registration algorithm used (Marcelo Silva, 2000)

32. II - UFRGS 7. VPat Activities F Volume visualization F 3D reconstruction of the human parts from real data Marching cubes implementation Study of multiresolution techniques F Motion simulation and body deformation (anatomic simulation of human bodies) F Other

33. II - UFRGS 7. VPat Images generated with the implementation of Marching Cubes algorithm (Eduardo Kenzo, 2000)

34. II - UFRGS 7. VPat Activities F Volume visualization F 3D reconstruction of the human parts from real data Marching cubes implementation Study of multiresolution techniques F Motion simulation and body deformation (anatomic simulation of human bodies) F Other

35. II - UFRGS Activities F Volume visualization F 3D reconstruction of the human parts from real data F Motion simulation and body deformation (anatomic simulation of human bodies) Mechanical modeling of joints Skeleton motion control Soft tissue deformation F Other 7. VPat Previous experience

36. II - UFRGS Previous experience F Nedel at EPFL (Ph.D. Thesis) 1) Anatomic modeling of the human skeleton 2) Simulation of muscles action 3) Muscles deformation 4) Framework for human body modeling and simulation 7. VPat

37. II - UFRGS Anatomic modeling of skeletons F Joints position F The skeleton ( Luciana Nedel, 1998) 7. VPat

38. II - UFRGS ( Luciana Nedel, 1998) 7. VPat

39. II - UFRGS Simulation of the muscles action F Action lines Represent mechanically the force that a muscle produces on a bone Composed by an origin, an insertion and optionally by one or more control points (Luciana Nedel, 1998) 7. VPat

40. II - UFRGS Muscles deformation F Mass-spring deformation model Example: compression Example: extension (Luciana Nedel, 1998) 7. VPat

41. II - UFRGS F Example: reconstructed muscle (Luciana Nedel, 1998) 7. VPat

42. II - UFRGS Framework to allow the human body modeling and simulation F Body Builder Plus - integration tool Allows the design of human models created entirely with bones and reconstructed muscles Combines deformable muscles with metaballs representing some muscles, organs and fat tissues 7. VPat

43. II - UFRGS F Body Builder Plus: examples... (Luciana Nedel, 1998) 7. VPat

44. II - UFRGS 7. VPat Activities F Volume visualization F 3D reconstruction of the human parts from real data F Motion simulation and body deformation (anatomic simulation of human bodies) Mechanical modeling of joints Skeleton motion control Soft tissue deformation Previous experience F Other

45. II - UFRGS 7. VPat F Surgery simulation (Luciana Nedel, 1999)

46. II - UFRGS 7. VPat Activities F Volume visualization F 3D reconstruction of the human parts from real data F Motion simulation and body deformation (anatomic simulation of human bodies) F Other Conception of the VPat framework Interaction and navigation techniques for surgery simulation systems

47. II - UFRGS http://www.inf.ufrgs.br/cg

48. Rendering and animation gallery 1995 1993