Posters

Permanent URI for this collection

https://diglib.eg.org/handle/10.2312/238

Multi-resolution modelling of terrains by using non restricted quadtree triangulation

[meta data] [files:
aguil.pdf
]
Aguilera, A.
; 
Torres, J. C.
; 
Feito, F.

Parametric Foveation for Progressive Texture and Model Transmission

[meta data] [files:
cheng.pdf
]
Cheng, Irene
; 
Basu, Anup
; 
Pan, Yixin

GreenArt: A Tool for Non-Photorealistic Rendering of Plants and Trees

[meta data] [files:
campos.pdf
]
Campos, C.
; 
Quirós, R.
; 
Huerta, J.
; 
Camahort, E.
; 
Lluch, J.
; 
Vivo, R.

Interactive demo: OpenGLfly, version Euskadi

[meta data] [files:
gomez.pdf
]
Gómez de Segura, José Daniel
; 
Fernández, Borja
; 
Peral, Rosa
; 
López, Susana
; 
Ibáñez, Eduardo

Combining 3D Scans and Motion Capture for Realistic Facial Animation

[meta data] [files:
breidt.pdf
]
Breidt, Martin
; 
Wallraven, Christian
; 
Cunningham, Douglas W.
; 
Buelthoff, Heinrich H.

Resampling structured grids into regular ones

[meta data] [files:
dimitro.pdf
]
Dimitrov, Leonid I.
; 
Kolcun, Aleksej
; 
Sramek, Milos

VR Game Interfaces for Interaction onto 3D Display

[meta data] [files:
choi.pdf
]
Choi, Jeong-Dan
; 
Jang, Byung-Tae
; 
Hwang, Chi-Jeong

Real time positioning system based on active stereo and facial features identification

[meta data] [files:
frosio.pdf
]
Frosio, Iuri
; 
Lanzarotti, Raffaella
; 
Campadelli, Paola
; 
Ferrigno, Giancarlo
; 
Borghese, N. Alberto

Image-based Extraction of Material Reflectance Properties of a 3D Rigid Object

[meta data] [files:
erdem.pdf
]
Erdem, M. Erkut
; 
Erdem, I. Aykut
; 
Atalay, Volkan

Pen and Ink Pictures from Gray-Scale Photographs

[meta data] [files:
arroyo.pdf
]
Arroyo, G.
; 
Martín, D.

Certosa virtual museum: a dynamic multilevel desktop VR application

[meta data] [files:
calori.pdf
]
Calori, L.
; 
Diamanti, T.
; 
Guidazzoli, A.
; 
Liguori, M. C.
; 
Mauri, M. A.
; 
Valentini, L.

Fast Marching farthest point sampling

[meta data] [files:
moenn.pdf
]
Moenning, Carsten
; 
Dodgson, Neil A.

Virtual Modelling

[meta data] [files:
kiss.pdf
]
Kiss, Szilárd
; 
Nijholt, Anton
; 
Zwiers, Job

Ashli – Advanced Shading Language Interface

[meta data] [files:
preeth.pdf
]
Preetham, Arcot J.
; 
Bleiweiss, Avi

Persepolis: Recovering history with a handheld camera

[meta data] [files:
sainz.pdf
]
Sainz, M.
; 
Susin, A.
; 
Cervantes, A.
; 
Bagherzadeh, N.

Large XML Document Manager and Visualizer

[meta data] [files:
merien.pdf
]
Merienne, J. P.
; 
Jacquemin, C.

Pedagogic discrete visualization of electromagnetic waves

[meta data] [files:
mora.pdf ,
mora_videos.zip
]
Mora, F.
; 
Ruillet, G.
; 
Andres, E.
; 
Vauzelle, R.

Point in Solid Tests for Triangle Meshes. Comparative Study

[meta data] [files:
ogayar.pdf
]
Ogayar, Carlos J.
; 
Segura, Rafael J.
; 
Feito, Francisco R.

Anisotropic Participating Media at Near Interactive Rates

[meta data] [files:
jimen.pdf
]
Jimenez, Juan-Roberto
; 
Pueyo, Xavier

Obscurances for ray-tracing

[meta data] [files:
mendez.pdf
]
Mendez, A.
; 
Sbert, M.
; 
Neumann, L.

A New 3D Spring for Deformable Object Animation

[meta data] [files:
jeong.pdf
]
Jeong, Il-Kwon
; 
Lee, Inho

A Spatial Representation for Ray-Scene Intersection Test Improvement in Complex Scenes

[meta data] [files:
revell.pdf
]
Revelles, J.
; 
Aguilera, N.
; 
Aguado, J.
; 
Lastra, M.
; 
Garcia, R.
; 
Montes, R.

Predictive fixed-frame rate tessellation of NURBS surfaces

[meta data] [files:
sanchez.pdf
]
Sanchez, H.
; 
Moreno, A.
; 
Garcia-Alonso, A.

Polygon-Polygon Collision Detection in 2D

[meta data] [files:
jimene.pdf
]
Jiménez Delgado, Juan J.
; 
Segura Sánchez, Rafael J.
; 
Feito Higueruela, Francisco R.

Curve Synthesis from Learned Refinement Models

[meta data] [files:
simhon.pdf
]
Simhon, Saul
; 
Dudek, Gregory

3D Model Search Engine Based on Lightfield Descriptors

[meta data] [files:
shen.pdf
]
Shen, Yu-Te
; 
Chen, Ding-Yun
; 
Tian, Xiao-Pei
; 
Ouhyoung, Ming

3deSoundBox – a Scalable, Platform-Independent 3D Sound System for Virtual and Augmented Reality Applications

[meta data] [files:
stampfl.pdf
]
Stampfl, Philipp

BibTeX (Posters)
@inproceedings{
:10.2312/egp.20031007,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Multi-resolution modelling of terrains by using non restricted quadtree triangulation}},

author = {
Aguilera, A.
 and 
Torres, J. C.
 and 
Feito, F.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031007}

}
@inproceedings{
:10.2312/egp.20031012,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Parametric Foveation for Progressive Texture and Model Transmission}},

author = {
Cheng, Irene
 and 
Basu, Anup
 and 
Pan, Yixin
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031012}

}
@inproceedings{
:10.2312/egp.20031011,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
GreenArt: A Tool for Non-Photorealistic Rendering of Plants and Trees}},

author = {
Campos, C.
 and 
Quirós, R.
 and 
Huerta, J.
 and 
Camahort, E.
 and 
Lluch, J.
 and 
Vivo, R.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031011}

}
@inproceedings{
:10.2312/egp.20031017,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Interactive demo: OpenGLfly, version Euskadi}},

author = {
Gómez de Segura, José Daniel
 and 
Fernández, Borja
 and 
Peral, Rosa
 and 
López, Susana
 and 
Ibáñez, Eduardo
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031017}

}
@inproceedings{
:10.2312/egp.20031009,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Combining 3D Scans and Motion Capture for Realistic Facial Animation}},

author = {
Breidt, Martin
 and 
Wallraven, Christian
 and 
Cunningham, Douglas W.
 and 
Buelthoff, Heinrich H.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031009}

}
@inproceedings{
:10.2312/egp.20031014,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Resampling structured grids into regular ones}},

author = {
Dimitrov, Leonid I.
 and 
Kolcun, Aleksej
 and 
Sramek, Milos
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031014}

}
@inproceedings{
:10.2312/egp.20031013,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
VR Game Interfaces for Interaction onto 3D Display}},

author = {
Choi, Jeong-Dan
 and 
Jang, Byung-Tae
 and 
Hwang, Chi-Jeong
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031013}

}
@inproceedings{
:10.2312/egp.20031016,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Real time positioning system based on active stereo and facial features identification}},

author = {
Frosio, Iuri
 and 
Lanzarotti, Raffaella
 and 
Campadelli, Paola
 and 
Ferrigno, Giancarlo
 and 
Borghese, N. Alberto
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031016}

}
@inproceedings{
:10.2312/egp.20031015,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Image-based Extraction of Material Reflectance Properties of a 3D Rigid Object}},

author = {
Erdem, M. Erkut
 and 
Erdem, I. Aykut
 and 
Atalay, Volkan
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031015}

}
@inproceedings{
:10.2312/egp.20031008,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Pen and Ink Pictures from Gray-Scale Photographs}},

author = {
Arroyo, G.
 and 
Martín, D.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031008}

}
@inproceedings{
:10.2312/egp.20031010,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Certosa virtual museum: a dynamic multilevel desktop VR application}},

author = {
Calori, L.
 and 
Diamanti, T.
 and 
Guidazzoli, A.
 and 
Liguori, M. C.
 and 
Mauri, M. A.
 and 
Valentini, L.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031010}

}
@inproceedings{
:10.2312/egp.20031024,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Fast Marching farthest point sampling}},

author = {
Moenning, Carsten
 and 
Dodgson, Neil A.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031024}

}
@inproceedings{
:10.2312/egp.20031021,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Virtual Modelling}},

author = {
Kiss, Szilárd
 and 
Nijholt, Anton
 and 
Zwiers, Job
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031021}

}
@inproceedings{
:10.2312/egp.20031027,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Ashli – Advanced Shading Language Interface}},

author = {
Preetham, Arcot J.
 and 
Bleiweiss, Avi
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031027}

}
@inproceedings{
:10.2312/egp.20031029,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Persepolis: Recovering history with a handheld camera}},

author = {
Sainz, M.
 and 
Susin, A.
 and 
Cervantes, A.
 and 
Bagherzadeh, N.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031029}

}
@inproceedings{
:10.2312/egp.20031023,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Large XML Document Manager and Visualizer}},

author = {
Merienne, J. P.
 and 
Jacquemin, C.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031023}

}
@inproceedings{
:10.2312/egp.20031025,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Pedagogic discrete visualization of electromagnetic waves}},

author = {
Mora, F.
 and 
Ruillet, G.
 and 
Andres, E.
 and 
Vauzelle, R.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031025}

}
@inproceedings{
:10.2312/egp.20031026,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Point in Solid Tests for Triangle Meshes. Comparative Study}},

author = {
Ogayar, Carlos J.
 and 
Segura, Rafael J.
 and 
Feito, Francisco R.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031026}

}
@inproceedings{
:10.2312/egp.20031019,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Anisotropic Participating Media at Near Interactive Rates}},

author = {
Jimenez, Juan-Roberto
 and 
Pueyo, Xavier
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031019}

}
@inproceedings{
:10.2312/egp.20031022,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Obscurances for ray-tracing}},

author = {
Mendez, A.
 and 
Sbert, M.
 and 
Neumann, L.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031022}

}
@inproceedings{
:10.2312/egp.20031018,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
A New 3D Spring for Deformable Object Animation}},

author = {
Jeong, Il-Kwon
 and 
Lee, Inho
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031018}

}
@inproceedings{
:10.2312/egp.20031028,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
A Spatial Representation for Ray-Scene Intersection Test Improvement in Complex Scenes}},

author = {
Revelles, J.
 and 
Aguilera, N.
 and 
Aguado, J.
 and 
Lastra, M.
 and 
Garcia, R.
 and 
Montes, R.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031028}

}
@inproceedings{
:10.2312/egp.20031030,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Predictive fixed-frame rate tessellation of NURBS surfaces}},

author = {
Sanchez, H.
 and 
Moreno, A.
 and 
Garcia-Alonso, A.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031030}

}
@inproceedings{
:10.2312/egp.20031020,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Polygon-Polygon Collision Detection in 2D}},

author = {
Jiménez Delgado, Juan J.
 and 
Segura Sánchez, Rafael J.
 and 
Feito Higueruela, Francisco R.
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031020}

}
@inproceedings{
:10.2312/egp.20031032,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
Curve Synthesis from Learned Refinement Models}},

author = {
Simhon, Saul
 and 
Dudek, Gregory
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031032}

}
@inproceedings{
:10.2312/egp.20031031,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
3D Model Search Engine Based on Lightfield Descriptors}},

author = {
Shen, Yu-Te
 and 
Chen, Ding-Yun
 and 
Tian, Xiao-Pei
 and 
Ouhyoung, Ming
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031031}

}
@inproceedings{
:10.2312/egp.20031033,

booktitle = {
Eurographics 2003 - Posters},

editor = {
title = {{
3deSoundBox – a Scalable, Platform-Independent 3D Sound System for Virtual and Augmented Reality Applications}},

author = {
Stampfl, Philipp
},
year = {
2003},

publisher = {
Eurographics Association},


ISSN = {1017-4656},

DOI = {
/10.2312/egp.20031033}

}

Browse

Recent Submissions

Now showing 1 - 27 of 27
  • Thumbnail Image
    Item
    Multi-resolution modelling of terrains by using non restricted quadtree triangulation
    (Eurographics Association, 2003) Aguilera, A.; Torres, J. C.; Feito, F.
    The interactive visualization of terrains requires the processing of a high amount of data in real time, usually it is not possible to work with all of them on main in memory. In this work we present, a method which solves the above problem by means of using spatial indices (quadtree). For that, the terrains are divided into square cells, each of them having a quadtree, which will only be refined up to a the detail level depending on the observer position. With this, allaus to reduce the time used for terrains visualization.
  • Thumbnail Image
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    Parametric Foveation for Progressive Texture and Model Transmission
    (Eurographics Association, 2003) Cheng, Irene; Basu, Anup; Pan, Yixin
    Spatially varying sensing (foveation) has been used in many different areas of Computer Vision, such as image compression and video teleconferencing and in perceptually driven Level of Detail (LOD) representations in graphics. In this work, we show that foveation is advantageous for interactive mesh and texture transmission in online 3D applications. Unlike traditional mesh representations where all 3D vertices need to be transmitted, we only need to transmit a collection of points-of-interest (foveae) and information on only one (rather than three) axis. Thereby, we can achieve a threefold reduction in the amount of data that needs to be transmitted to represent a new 3D model. Our research differs from level of detail (LOD) based approaches using perceptually driven simplification in that (i) the mesh and texture resolutions vary smoothly and continuously in our approach compared to distinct levels of details in adjoining regions in other foveated or multiresolution LOD based methods; and (ii) the approach works for an integrated foveated texture and mesh representation. The current implementation extends our past research in image and video compression [1] and is restricted to regular grid mesh representation produced by 3D scanners.
  • Thumbnail Image
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    GreenArt: A Tool for Non-Photorealistic Rendering of Plants and Trees
    (Eurographics Association, 2003) Campos, C.; Quirós, R.; Huerta, J.; Camahort, E.; Lluch, J.; Vivo, R.
    Plant and tree rendering is critical to many computer graphics applications, like interactive walkthroughs, architectural presentations, entertaintment and computer games. Current research focuses on realistic modeling and rendering of plants and trees. In this paper, however, we focus on non-photorealistic rendering of these models. We introduce GreenArt, a tool for a modeling and rendering non-photorealistic plants and trees. We present GreenArt’s functionality and capabilities and we show some examples of scenes generated using the system.
  • Thumbnail Image
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    Interactive demo: OpenGLfly, version Euskadi
    (Eurographics Association, 2003) Gómez de Segura, José Daniel; Fernández, Borja; Peral, Rosa; López, Susana; Ibáñez, Eduardo
    This paper describes the demo associated to one of our projects, which is currently under development. The version presented can be considered as a large terrain simulation over the Basque Country area (North of Spain), with real imagery, georeferenced information and a user friendly and interactive interface. The main goal is to demonstrate the applications of virtual reality techniques to fields such as virtual tourism, low cost simulators or edutainment. The requirements of the demo are low enough for it to be run in a home PC with a middle range graphics accelerator card. Currently, there are some OpenGL optimisations specific to NVIDIA chipsets and consequently this platform has a slight advantage in terms of performance.
  • Thumbnail Image
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    Combining 3D Scans and Motion Capture for Realistic Facial Animation
    (Eurographics Association, 2003) Breidt, Martin; Wallraven, Christian; Cunningham, Douglas W.; Buelthoff, Heinrich H.
    We present ongoing work on the development of new methods for highly realistic facial animation. One of the main contributions is the use of real-world, high-precision data for both the timing of the animation and the deformation of the face geometry. For animation, a set of morph shapes acquired through a 3D scanner is linearly morphed according to timing extracted from point tracking data recorded with an optical motion capture system.
  • Thumbnail Image
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    Resampling structured grids into regular ones
    (Eurographics Association, 2003) Dimitrov, Leonid I.; Kolcun, Aleksej; Sramek, Milos
    Structured grids and some of their applications in natural sciences are discussed. The problem of their visualization and quantitative evaluation is considered and possible ways for its solution sketched. Resampling a structured grid onto a regular one is one of the possible solutions offering the additional benefit of opening up more possibilities for qualification and quantification, too. Some methods for achieving this goal are presented, their advantages and disadvantages compared, and preliminary results from the application of our own method shown.
  • Thumbnail Image
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    VR Game Interfaces for Interaction onto 3D Display
    (Eurographics Association, 2003) Choi, Jeong-Dan; Jang, Byung-Tae; Hwang, Chi-Jeong
    This paper describes the VR game interfaces for interaction onto 3D display. The challenge we are interested in is how to build and use a low cost 3D display that satisfies semi-immersive requirements and how to coordinate it with interactions into the immersive VR game environments. So, the objective of our display system is to produce a viewer-oriented, stereoscopic display; each of the user’s eyes should see an image correctly rendered from that eye’s position through the window of the displays. To accomplish this project, we concrete a projection-based multiple window rendering system on passive 3D stereo display, synchronization multichannel system for wide field of view on different PCs, and game user interactions using real-time virtual character animations. Our preliminary results are well suited for VR Safari as game contents with surround displays running on a PC clusters.
  • Thumbnail Image
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    Real time positioning system based on active stereo and facial features identification
    (Eurographics Association, 2003) Frosio, Iuri; Lanzarotti, Raffaella; Campadelli, Paola; Ferrigno, Giancarlo; Borghese, N. Alberto
    We propose a new system for patient’s head positioning for radiology and radiotherapy. The system is constituted of two low-cost digital cameras and a digital projector. As a first step a bright pattern is projected onto the subject’s face and a 3D model of the face is reconstructed in real-time. The pattern guides the selection of feature regions of the face: the eyes, the lips and the nose. Inside these regions features are recognized using image processing techniques; 3D many-fold analysis can improve this stage. From these features the position and orientation over time of the face can be determined.
  • Thumbnail Image
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    Image-based Extraction of Material Reflectance Properties of a 3D Rigid Object
    (Eurographics Association, 2003) Erdem, M. Erkut; Erdem, I. Aykut; Atalay, Volkan
    In this study, we concentrate on the extraction of reflectance properties of a 3D rigid object from its 2D images and the other aim of this work is rendering the object in real-time with photorealistic quality in varying illumination conditions. The reflectance property of the object is decomposed in diffuse and specular components. While the diffuse components are stored in a global texture, the specularity of the object is represented by a single Bidirectional Reflectance Distribution Function (BRDF). In the rendering phase, these two components are combined to obtain the behavior of the real surface property of the object.
  • Thumbnail Image
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    Pen and Ink Pictures from Gray-Scale Photographs
    (Eurographics Association, 2003) Arroyo, G.; Martín, D.
    A new method for producing pen and ink pictures from gray-scale photographs is introduced in this article. It is based on path-finding and reconstruction of strokes. First we apply filters to extract contours from photographs which are converted to strokes, then we show how to modify these strokes in the same way an artist could do it. The strokes are not pixel-based but bspline curves, which are rendered simuling different kinds of brushes and papers.
  • Thumbnail Image
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    Certosa virtual museum: a dynamic multilevel desktop VR application
    (Eurographics Association, 2003) Calori, L.; Diamanti, T.; Guidazzoli, A.; Liguori, M. C.; Mauri, M. A.; Valentini, L.
    Starting from the exigencies of restoration, safeguard and promotion set by Bologna City Council for its Museum of the Certosa Cemetery, a multilevel application has been developed. Its main features are dynamic generation of models, interaction with objects, link to relational multimedia database, DTM and a friendly, computer games like interface. The outcome is a flexible product, both from a technological point of view – it can be experienced on low cost platforms as well as in HI End systems - and for the possible kind of fruition, that can involve several different groups of users.
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    Fast Marching farthest point sampling
    (Eurographics Association, 2003) Moenning, Carsten; Dodgson, Neil A.
    We introduce the Fast Marching farthest point sampling (FastFPS) approach for the progressive sampling of planar domains and curved manifolds in triangulated, point cloud or implicit form. By using Fast Marching methods2, 3, 6 for the incremental computation of distance maps across the sampling domain, we obtain a farthest point sampling technique superior to earlier point sampling principles in two important respects. Firstly, our method performs equally well in both the uniform and the adaptive case. Secondly, the algorithm is applicable to both images and higher dimensional surfaces in triangulated, point cloud or implicit form. This paper presents the methods underlying the algorithm and gives examples for the processing of images and triangulated surfaces. A companion report4 provides details regarding the application of the FastFPS algorithm to point clouds and implicit surfaces.
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    Virtual Modelling
    (Eurographics Association, 2003) Kiss, Szilárd; Nijholt, Anton; Zwiers, Job
    We concentrate our efforts on building virtual modelling environments where the content creator uses controls (widgets) as an interactive adjustment modality for the properties of the edited objects. Besides the advantage of being an on-line modelling approach (visualised just like any other on-line VRML content), our approach provides also instant visualisation and an intuitive, graphical editing modality. Although visual modelling environments are more powerful in content creation than a text editor, our aim is to include certain domain knowledge to extend their capabilities. Our most recent system is a 3D character modeller capable of handling H-anim or other types of hierarchies (based also on H-anim components) and the geometry attached to them. The modelling is based on the properties of regular grid geometries, on H-anim hierarchies and where applicable, on 3D character symmetry. The novelty of our approach consists of 1) natural graphics components; 2) integrating the interface elements into the virtual environment itself; 3) rule based modelling of 3D characters; 4) on-line modelling.
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    Ashli – Advanced Shading Language Interface
    (Eurographics Association, 2003) Preetham, Arcot J.; Bleiweiss, Avi
    The support for IEEE floating point computation and the exposure of shading functionality in a standardize API form have made graphics hardware a viable workflow solution to an artist involved in digital content creation (DCC). Nevertheless, there still remains a significant interface void between the abstract shading description an artist is used to and the low level shading constructs the hardware expec ts. We have developed Ashli, an advanced shading language interface tool, with the primary motivation to bridge the interface gap fore mentioned. Ashli is developed in the form of a case study. It takes in high level shading languages and descriptions and at the end emits standard graphics hardware shading API (e.g. Microsoft DirectX and OpenGL). Ashli‘s main contribution is in its seamless cooperation with the DCC graphics application. The RenderMan®‡ Shading Language, Maya® Shading Network and 3ds Max® Standard Materials are the subset of input abstraction we have experimented with to validate our approach. Shading path computation complexity and conformance to hardware resource constraints are owned by Ashli and for the most part made transparent to the artist. A tool like Ashli essentially retains rendered image appearance quality comparable to the level produced by a software renderer, but at a significant higher rate of interaction efficiency. We present Ashli in the context of a stand -alone viewing application framework, depicting shading path computation bound to scene rendering. We demonstrate the application design and results for using Ashli as a shading coprocessor assist.
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    Persepolis: Recovering history with a handheld camera
    (Eurographics Association, 2003) Sainz, M.; Susin, A.; Cervantes, A.; Bagherzadeh, N.
    In this paper we present new improvements to our novel pipeline for image based modeling of objects using a camcorder. Our system takes an uncalibrated sequence of images recorded around a scene, it automatically recovers the underlying 3D structure and camera path and then a volumetric scene reconstruction is performed using a hardware accelerated voxel carving approach. Finally a triangular mesh is obtained and the available information from the images is combined to generate a full 3D photo-realistic reconstruction. As an application, we use this system to reconstruct parts of the archeological site of Persepolis (Iran).
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    Large XML Document Manager and Visualizer
    (Eurographics Association, 2003) Merienne, J. P.; Jacquemin, C.
    This work presents an interactive Graphical User Interface used to display and manipulate collection of large XML documents. It relies on a geometrical model that combines hierarchical and sequential representations. In this interface, XML structures are displayed on an inclined plane in a 3D environment. This interface provides users with a visualization that speeds up searches in collection of documents through simple interaction techniques. Document browsing is facilitated through display space optimization and direct manipulation of document structures. Besides, this approach tries to take advantage of 3D by engaging human 3D spatial cognitive capabilities while using 2D interaction to not disrupt user's habits. A user evaluation for document access is reported that shows that our interface tends to be faster than 2D interface in data searching while taking advantage of the user's natural attraction to 3D interface.
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    Pedagogic discrete visualization of electromagnetic waves
    (Eurographics Association, 2003) Mora, F.; Ruillet, G.; Andres, E.; Vauzelle, R.
    A dynamic electromagnetic wave propagation visualization tool is presented in this paper. It can simulate wave reflection and diffraction in 2D. It allows to visualize the electric field magnitude. The original approach is based on discrete analytical geometry allowing a dynamic visualization of the wave propagation contrary to existing models. We use it for the moment as pedagogic tool for the understanding of this complex phenomenon.
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    Point in Solid Tests for Triangle Meshes. Comparative Study
    (Eurographics Association, 2003) Ogayar, Carlos J.; Segura, Rafael J.; Feito, Francisco R.
    This document presents a comparative study of several point inclusion tests for triangle meshes. We also discuss some issues about the usefulness of each method depending on the situation, taking into account memory and CPU usage. The goal is to compare the performance of well known spatial classification algorithms with a modified implementation of Feito-Torres, optimized to work only with triangle meshes. A description of studied methods is also presented, with implementation issues and time tables showing the performance of each algorithm. The tests highlight both weak points and virtues of each approach.
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    Anisotropic Participating Media at Near Interactive Rates
    (Eurographics Association, 2003) Jimenez, Juan-Roberto; Pueyo, Xavier
    This article presents an algorithm for the realistic simulation, at near interactive rates, of globally illuminated scenes including participating media, isotropic and anisotropic. The proposed algorithm is divided in three phases: particle tracing, reconstruction and rendering. The particle tracing phase is based on the Monte Carlo light tracing. The goal of this phase is to deliver the light energy from the sources, over the scene’s object. In the reconstruction phase the algorithm derives one texture for each object in the scene, 2D textures for surfaces and 3D textures for participating media. Each texel represents the outgoing radiance, in a given direction, from a region of the object. The method uses density estimation techniques to compute the textures. In the final phase, the algorithm renders the textures using hardware graphics capabilities.
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    Obscurances for ray-tracing
    (Eurographics Association, 2003) Mendez, A.; Sbert, M.; Neumann, L.
    We present a powerful method to create realistic-looking pictures of scenes with objects that have diffuse and non-diffuse properties. The method recreates the obscurances technique, introduced some years ago, with a new approach based on ray-tracing. The first version of the obscurances technique was used only for diffuse environments. It is already working successfully in some widely known video games because it is able to avoid the high cost of radiosity techniques in the interactive and real-time game environments. Soft shadows, nice colour reflection effects, visually pleasant rendering of corners and other partly occluded surfaces of the scene are reproduced at a small fraction of the cost of radiosity. We extend here obscurances to handle non-diffuse environments via ray-tracing. Instead of computing the obscurance of every patch in the scene, we will compute view-dependent obscurances. The direct illumination is separately handled and diffuse color albedo functions are used for obscurance computation. Ray-traced obscurances can be useful in animation, both in the editing phase and/or in final images, and in ray-traced games, when the use of future graphics cards will decrease dramatically the cost of tracing a ray.
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    A New 3D Spring for Deformable Object Animation
    (Eurographics Association, 2003) Jeong, Il-Kwon; Lee, Inho
    A new3D spring for deformable object animation is proposed. Currently mass-spring system is most widely used in a deformable object animation as well as cloth animation. In order to perform a realistic cloth animation using the conventional mass-spring system, one requires three kinds of springs, that is, structural spring, shear spring, and bend spring. Performing a deformable object animation of a given geometric model also requires user’s knowledge or trial-and-error on constructing a stable spring network. For example, a cube model constructed from the edges used in faces for rendering would collapse, and one should use additional springs connecting the vertices inside the cube in order to make a stable spring model for simulation. Using the proposed 3D spring all this tedious and complicated modeling procedure can be omitted and one can easily construct a stable mass and 3D spring model from a geometric model with arbitrary shape. In addition to that, our 3D spring makes it possible to animate sharp folds of a very thin object easily and efficiently without any additional geometrical procedure.
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    A Spatial Representation for Ray-Scene Intersection Test Improvement in Complex Scenes
    (Eurographics Association, 2003) Revelles, J.; Aguilera, N.; Aguado, J.; Lastra, M.; Garcia, R.; Montes, R.
    We present a spatial representation based on a hierarchical structure using the well-known spatial indexing structure called octree. There are very useful spatial representations for scenes whose objects can be distributed in clusters and here we present a new one. In order to prove its benefits, several results are shown in scenes using a photom tracing algorithm to compute the global illumination based on photon map. These results show that the hierarchy of octrees becomes a good choice to improve the performance when compare to other strategies such as octrees and hierarchy of uniform grids3.
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    Predictive fixed-frame rate tessellation of NURBS surfaces
    (Eurographics Association, 2003) Sanchez, H.; Moreno, A.; Garcia-Alonso, A.
    In this work we propose a predictive fixed-frame rate scheme that shows how to control the visualization frame rate using uniform dynamic tessellation. Similar to previous works5; 6, tessellation quality criteria is based on the triangle edge length.
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    Polygon-Polygon Collision Detection in 2D
    (Eurographics Association, 2003) Jiménez Delgado, Juan J.; Segura Sánchez, Rafael J.; Feito Higueruela, Francisco R.
    Collision detection between moving objects is an open question which raises major problems concerning its algorithmic complexity. In this paper we present a polygon collision detection algorithm which uses polygon decomposition through triangle coverings and polygon influence areas (implemented by signs of barycentric coordinates). By using influence areas and the temporal and spatial coherence property, the amount of time needed to detect a collision between objects is reduced. By means of these techniques, a valid representation for any kind of polygon is obtained, whether concave or convex, manifold or nonmanifold, with or without holes, as well as a collision detection algorithm for this type of figures. This detection algorithm has been compared with the well-known PIVOT2D1 one and better results have been achieved in most situations. This improvement together with its possible extension to 3D makes it an attractive method because pre-processing of the polygons is no longer necessary. Besides, since this method uses sign operations, it proves to be a simple, more efficient and robust method.
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    Curve Synthesis from Learned Refinement Models
    (Eurographics Association, 2003) Simhon, Saul; Dudek, Gregory
    We present a method for generating refined 2D illustrations from hand drawn outlines consisting of only curve strokes. The system controllably synthesizes novel illustrations by augmenting the hand drawn curves’ shape, thickness, color and surrounding texture. These refinements are learned from a training ensemble. Users can select several examples that depict the desired idealized look and train the system for that type of refinement. Further, given several types of refinements, our system automatically recognizes the curve and applies the appropriate refinement. Recognition is accomplished by evaluating the likelihood the curve belongs to a particular class based on both its shape and context in the illustration.
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    3D Model Search Engine Based on Lightfield Descriptors
    (Eurographics Association, 2003) Shen, Yu-Te; Chen, Ding-Yun; Tian, Xiao-Pei; Ouhyoung, Ming
    With the development of modern 3D modelling and digitizing tools, more and more models have been created recently, which leads to the necessity of the technique of 3D model retrieval system. Our 3D model search engine has been designed with the goal to meet entertaining, industrial, commercial, medical, and educational needs. The system is available on the Web (http://3d.csie.ntu.edu.tw) with a database containing over 10,000 models free downloaded through the Internet. Users can query 3D models by text, drawing 2D shapes using a friendly painting interface, or selecting one 3D model as a query key interactively. The features representing a 3D object, namely, the Lightfield Descriptors, are extracted from 2D images, which are rendered from cameras positioned on the vertices of a regular dodecahedron. The Lightfield Descriptors of each model are used to compare similarities among each other, and the retrieval process takes only 2 and 0.1 seconds with a 3D model and 2D shapes, respectively. During four months, the system has been widely used for querying over three thousand times from 418 IP addresses in at least 27 countries.
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    3deSoundBox – a Scalable, Platform-Independent 3D Sound System for Virtual and Augmented Reality Applications
    (Eurographics Association, 2003) Stampfl, Philipp
    Sound is one of the most important components in animations, presentations and especially immersive environments. Many aspects are recognized more intuitively when sound supports vision and it is easier to follow a story and to believe in a virtual world of illusion. The 3deSoundBox was designed to provide this important acoustic component for such kind of 3D applications in an easy and intuitive way. It is scalable, platform-independent, has an easy to use interface and offers a lot of new possibilities in the field of virtual and augmented reality applications. The 3deSoundBox system can drive any number of speakers and works with any application on any platform with the same range of service. Once programmed, an application can easily take advantage of these features, as it will work on any sound-system with any number of speakers without requiring any changes, due to the scalable architecture of the system.