Issue 4

Permanent URI for this collection

https://diglib7.eg.org/handle/10.2312/102

Eurographics

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Rendering Silhouettes with Virtual Lights

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Martin, Domingo
; 
Torres, Juan Carlos

Editorial

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Duke, David
; 
Scopigno, Roberto

Visibility Driven Rasterization

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Meissner, M.
; 
Bartz, D.
; 
Gunther, R.
; 
Strasser, W.

Rendering Natural Waters

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Premoze, Simon
; 
Ashikhmin, Michael

Control of Feature-point-driven Facial Animation Using a Hypothetical Face

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Su, Ming-Shing
; 
Ko, Ming-Tat
; 
Cheng, Kuo-Young

Guided Exploration with Dynamic Potential Fields: the Cubical Path System

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Beckhaus, Steffi
; 
Ritter, Felix
; 
Strothotte, Thomas

Interactive Display of Global Illumination Solutions for Non-diffuse Environments - A Survey

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Heidrich, Wolfgang

Visual Perception in Realistic Image Synthesis

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McNamara, Ann

Haptic Device Control - Will it Fit Standardized Input Models?

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Arnold, D. B.
; 
Day, A. M.
; 
Jennings, V.
; 
Courtenay, A.
; 
Duce, D. A.

CP3: Robust, Output-sensitive Display of Convex Polyhedra in Scanline Mode

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Barkan, Ella
; 
Gordon, Dan

BibTeX (Issue 4)
                
@article{
10.1111:1467-8659.00556,

journal = {Computer Graphics Forum},
title = {{
Eurographics}},

author = {},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00556}

}
                
@article{
10.1111:1467-8659.00554,

journal = {Computer Graphics Forum},
title = {{
Rendering Silhouettes with Virtual Lights}},

author = {
Martin, Domingo
 and 
Torres, Juan Carlos
},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00554}

}
                
@article{
10.1111:1467-8659.00546,

journal = {Computer Graphics Forum},
title = {{
Editorial}},

author = {
Duke, David
 and 
Scopigno, Roberto
},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00546}

}
                
@article{
10.1111:1467-8659.00555,

journal = {Computer Graphics Forum},
title = {{
Visibility Driven Rasterization}},

author = {
Meissner, M.
 and 
Bartz, D.
 and 
Gunther, R.
 and 
Strasser, W.
},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00555}

}
                
@article{
10.1111:1467-8659.00548,

journal = {Computer Graphics Forum},
title = {{
Rendering Natural Waters}},

author = {
Premoze, Simon
 and 
Ashikhmin, Michael
},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00548}

}
                
@article{
10.1111:1467-8659.00547,

journal = {Computer Graphics Forum},
title = {{
Control of Feature-point-driven Facial Animation Using a Hypothetical Face}},

author = {
Su, Ming-Shing
 and 
Ko, Ming-Tat
 and 
Cheng, Kuo-Young
},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00547}

}
                
@article{
10.1111:1467-8659.00549,

journal = {Computer Graphics Forum},
title = {{
Guided Exploration with Dynamic Potential Fields: the Cubical Path System}},

author = {
Beckhaus, Steffi
 and 
Ritter, Felix
 and 
Strothotte, Thomas
},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00549}

}
                
@article{
10.1111:1467-8659.00551,

journal = {Computer Graphics Forum},
title = {{
Interactive Display of Global Illumination Solutions for Non-diffuse Environments - A Survey}},

author = {
Heidrich,  Wolfgang
},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00551}

}
                
@article{
10.1111:1467-8659.00550,

journal = {Computer Graphics Forum},
title = {{
Visual Perception in Realistic Image Synthesis}},

author = {
McNamara, Ann
},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00550}

}
                
@article{
10.1111:1467-8659.00552,

journal = {Computer Graphics Forum},
title = {{
Haptic Device Control - Will it Fit Standardized Input Models?}},

author = {
Arnold, D. B.
 and 
Day, A. M.
 and 
Jennings, V.
 and 
Courtenay, A.
 and 
Duce, D. A.
},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00552}

}
                
@article{
10.1111:1467-8659.00553,

journal = {Computer Graphics Forum},
title = {{
CP3: Robust, Output-sensitive Display of Convex Polyhedra in Scanline Mode}},

author = {
Barkan, Ella
 and 
Gordon, Dan
},
year = {
2001},

publisher = {
Blackwell Publishers Ltd and the Eurographics Association},


ISSN = {1467-8659},

DOI = {
10.1111/1467-8659.00553}

}

Browse

Recent Submissions

Now showing 1 - 11 of 11
  • No Thumbnail Available
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    Eurographics
    (Blackwell Publishers Ltd and the Eurographics Association, 2001)
  • No Thumbnail Available
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    Rendering Silhouettes with Virtual Lights
    (Blackwell Publishers Ltd and the Eurographics Association, 2001) Martin, Domingo; Torres, Juan Carlos
    We present a new method for obtaining non-photorealistic images. These images have two main visual components: silhouettes and non-realistic colouring. Silhouettes are lines that define the form of an object. They are used in classical animation and illustration as the main expressive components. In these applications, if it is necessary, colouring can be added once the drawings are made. For instance, generally, in illustration, colouring is flat and does not transmit volume information whilst silhouettes do it in an economical way. The proposed method is based on the Virtual Lights model, which allows us to use external components, the virtual lights, to define silhouettes. In this way, the designer is free to control where, when and how the silhouettes must appear. The method can be used with B-rep geometric models.
  • No Thumbnail Available
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    Editorial
    (Blackwell Publishers Ltd and the Eurographics Association, 2001) Duke, David; Scopigno, Roberto
  • No Thumbnail Available
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    Visibility Driven Rasterization
    (Blackwell Publishers Ltd and the Eurographics Association, 2001) Meissner, M.; Bartz, D.; Gunther, R.; Strasser, W.
    We present a new visibility driven rasterization scheme that significantly increases the rendering performance of modern graphic subsystems. Instead of rasterizing, texturing, lighting, and depth-testing each individual pixel, we introduce a two-level visibility mask within the rasterization stage which facilitates the removal of groups of pixels and triangles from rasterization and subsequent pipeline stages.Local visibility information is stored within the visibility mask that is updated several times during the generation of a frame. The update can easily be accomplished by extending already available (in hardware) occlusion culling mechanisms (i.e. those of HP and SGI), where it is possible to integrate the additional functionality without any additional delay cycles. In addition to these existing hardware based occlusion culling approaches-which cull only geometry contained in bounding volumes determined as occluded-we are able to significantly accelerate the rendering of the geometry determined as visible. However, our approach does not specifically rely on such occlusion culling hardware.The proposed new rasterization scheme is well suited for hardware implementation, can easily be integrated into low-cost rasterizers, and its scalability can vary upon available chip real estate. Only incremental modifications of modern graphics subsystems are required to achieve a significant improvement in rendering performance.
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    Rendering Natural Waters
    (Blackwell Publishers Ltd and the Eurographics Association, 2001) Premoze, Simon; Ashikhmin, Michael
    Creating and rendering realistic water is one of the most daunting tasks in computer graphics. Realistic rendering of water requires that the sunlight and skylight illumination are correct, the water surface is modeled accurately and that the light transport within water body is properly handled. This paper describes a method for wave generation on a water surface using a physically-based approach. The wave generation uses data from the oceanographical observations and it is controlled by intuitive parameters such as wind speed and wind direction. The optical behavior of the water surfaces is complex but is well-described in the ocean science literature. We present a simple and intuitive light transport approach that is easy to use for many different water types such as deep ocean water, muddy coastal water, and fresh water bodies. We demonstrate our model for a number of water and atmospheric conditions.
  • No Thumbnail Available
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    Control of Feature-point-driven Facial Animation Using a Hypothetical Face
    (Blackwell Publishers Ltd and the Eurographics Association, 2001) Su, Ming-Shing; Ko, Ming-Tat; Cheng, Kuo-Young
    A new approach to the generation of a feature-point-driven facial animation is presented. In the proposed approach, a hypothetical face is used to control the animation of a face model. The hypothetical face is constructed by connecting some predefined facial feature points to create a net so that each facet of the net is represented by a Coon's surface. Deformation of the face model is controlled by changing the shape of the hypothetical face, which is performed by changing the locations of feature points and their tangents. Experimental results show that this hypothetical-face-based method can generate facial expressions which are visually almost identical to those of a real face.
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    Guided Exploration with Dynamic Potential Fields: the Cubical Path System
    (Blackwell Publishers Ltd and the Eurographics Association, 2001) Beckhaus, Steffi; Ritter, Felix; Strothotte, Thomas
    Exploring unknown models or scenes is a highly interactive and dynamic process. Systems for automatic presentation of models or scenes either require cinematographic rules, direct human interaction, framesets, or pre-calculation of paths to a known goal. In this paper we present a system which can deal with rapidly changing user interest in objects of a scene or model as well as with dynamic models and changes of the camera position introduced interactively by the user or through cuts. We describe CubicalPath, a new potential field-based camera control system that helps with the exploration of virtual environments.
  • No Thumbnail Available
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    Interactive Display of Global Illumination Solutions for Non-diffuse Environments - A Survey
    (Blackwell Publishers Ltd and the Eurographics Association, 2001) Heidrich, Wolfgang
    In recent years there has been a lot of work on interactively displaying global illumination solutions for non-diffuse environments. This is an extremely active field of research, in which a lot of different approaches have recently been proposed. In this survey, we will discuss and compare these. This will hopefully prepare the ground for systematically addressing the open questions in the future.
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    Visual Perception in Realistic Image Synthesis
    (Blackwell Publishers Ltd and the Eurographics Association, 2001) McNamara, Ann
    Realism is often a primary goal in computer graphics imagery, and we strive to create images that are perceptually indistinguishable from an actual scene. Rendering systems can now closely approximate the physical distribution of light in an environment. However, physical accuracy does not guarantee that the displayed images will have authentic visual appearance. In recent years the emphasis in realistic image synthesis has begun to shift from the simulation of light in an environment to images that look as real as the physical environment they portray. In other words the computer image should be not only physically correct but also perceptually equivalent to the scene it represents. This implies aspects of the Human Visual System (HVS) must be considered if realism is required. Visual perception is employed in many different guises in graphics to achieve authenticity. Certain aspects of the visual system must be considered to identify the perceptual effects that a realistic rendering system must achieve in order to reproduce effectively a similar visual response to a real scene. This paper outlines the manner in which knowledge about visual perception is increasingly appearing in state-of-the-art realistic image synthesis. After a brief overview of the HVS, this paper is organized into four sections, each exploring the use of perception in realistic image synthesis, each with slightly different emphasis and application. First, Tone Mapping Operators, which attempt to map the vast range of computed radiance values to the limited range of display values, are discussed. Then perception based image quality metrics, which aim to compare images on a perceptual rather than physical basis, are presented. These metrics can be used to evaluate, validate and compare imagery. Thirdly, perception driven rendering algorithms are described. These algorithms focus on embedding models of the HVS directly into global illumination computations in order to improve their efficiency. Finally, techniques for comparing computer graphics imagery against the real world scenes they represent are discussed.
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    Haptic Device Control - Will it Fit Standardized Input Models?
    (Blackwell Publishers Ltd and the Eurographics Association, 2001) Arnold, D. B.; Day, A. M.; Jennings, V.; Courtenay, A.; Duce, D. A.
    Over recent years a wide variety of interaction devices involving haptic feedback have been brought to the market, but they vary widely in terms of input measures recorded. These range from one dimensional input on a haptic feedback steering wheel to a six degree of freedom position and orientation device and further, to assemblies of such devices. On the surface most of the variations can be accommodated logically with standardized input models combining existing logical input devices and haptic feedback processes as acknowledgement/echos. However it is very uncertain whether such a model can adequately model the system requirements for effective haptic feedback.In this paper we review the input models that have developed over the past 20 years and ask "Is it the end of the road for the conceptual model of input incorporated into the early graphics standards and elaborated over the years?" In addition, to highlight the problems of implementation with haptic interaction, we describe a typical application, the simulation of a collision with a virtual wall.
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    CP3: Robust, Output-sensitive Display of Convex Polyhedra in Scanline Mode
    (Blackwell Publishers Ltd and the Eurographics Association, 2001) Barkan, Ella; Gordon, Dan
    A new technique is developed for displaying disjoint convex polyhedra. The method has the following properties: It is output-sensitive, displays the objects in scanline mode, and it is naturally robust. There is no complex data structure uniting the different polyhedra, so dynamic insertions and deletions are simple. Its robustnes is based on a novel method of comparing depths by representative "axes" of objects instead of surfaces. The method is based on two extensions of the "critical-points" method for polygon scan conversion: One extension allows the efficient display of planar graphs in scanline mode, and another extension is into the third dimension. Test runs indicate that it compares extremely favorably with other methods that operate in scanline mode, as well as with standard software and hardware techniques of medium-level workstations.