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Hierarchical techniques for global illumination computations-recent trends and developments

Hierarchical techniques for global illumination computations...

引用

pacific conference on computer graphics and applications

作者： P. Slusallek M. Stamminger H.-P. Seidel Computer Graphics Group University of Erlangen Nuremberg Germany

Since the beginning of computer graphics, one of the primary goals has been to create convincingly realistic images of three-dimensional environments that would be impossible to distinguish from photographs of the real scene. The goal to create photo-realistic images has lead to the development of completely new software techniques for dealing with the inherent geometric and optical complexity of real world scenes. This paper gives an overview of advanced algorithms for photo-realistic rendering and in particular discusses hierarchical techniques for global illumination computations.

关键词： Lighting Rendering (computer graphics) Layout Image generation computer graphics Computational modeling Frequency Optical propagation Geometrical optics Ray tracing

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Gesticulation behaviors for virtual humans

Gesticulation behaviors for virtual humans

引用

pacific conference on computer graphics and applications

作者： Liwei Zhao N.I. Badler Center for Human Modeling and Simulation Department of Computer and Information Science University of Pennsylvania Philadelphia PA USA

Gesture and speech are two very important behaviors for virtual humans. They are not isolated from each other but generally employed simultaneously in the service of the same intention. An underlying PaT-Net parallel finite state machine may be used to coordinate them both. Gesture selection is not arbitrary. Typical movements correlated with specific textual elements are used to select and produce gesticulation online. This enhances the expressiveness of speaking virtual humans.

关键词： Humans Kinematics Speech synthesis Computational modeling computer simulation Information science Avatars Concrete Shape Turning

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PRICAI 2023: Trends in Artificial Intelligence 1

引用

丛书名： Lecture Notes in computer Science

1000年

作者： Fenrong Liu Arun Anand Sadanandan Duc Nghia Pham Petrus Mursanto Dickson Lukose

ISBN: (数字)9789819970193

ISBN: (纸本)9789819970186

This three-volume set, LNCS 14325-14327 constitutes the thoroughly refereed proceedings of the 20th pacific Rim conference on Artificial Intelligence, PRICAI 2023, held in Jakarta, Indonesia, in November 2023.;The 95 full papers and 36 short papers presented in these volumes were carefully reviewed and selected from 422 submissions. PRICAI covers a wide range of topics in the areas of social and economic importance for countries in the pacific Rim: artificial intelligence, machine learning, natural language processing, knowledge representation and reasoning, planning and scheduling, computer vision, distributed artificial intelligence, search methodologies, etc.

关键词： Artificial Intelligence Computing Milieux computer Systems Organization and Communication Networks computer applications computer Imaging, Vision, Pattern Recognition and graphics

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PRICAI 2023: Trends in Artificial Intelligence 1

引用

丛书名： Lecture Notes in computer Science

1000年

作者： Fenrong Liu Arun Anand Sadanandan Duc Nghia Pham Petrus Mursanto Dickson Lukose

ISBN: (数字)9789819970223

ISBN: (纸本)9789819970216

关键词： Artificial Intelligence Computing Milieux computer Systems Organization and Communication Networks computer applications computer Imaging, Vision, Pattern Recognition and graphics

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Efficient rendering of optical effects within water using graphics hardware

Efficient rendering of optical effects within water using gr...

引用

pacific conference on computer graphics and applications

作者： K. Iwasaki Y. Dobashi T. Nishita University of Tokyo Bunkyo Tokyo Japan Hokkaido University Sapporo Japan

The display of realistic natural scenes is one of the most important research areas in computer graphics. The rendering of water is one of the essential components. The paper proposes an efficient method for rendering images of scenes within water. For underwater scenery, the shafts of light and caustics are attractive and important elements. However, computing these effects is difficult and time-consuming, since light refracts when passing through waves. To address the problem, our method makes use of graphics hardware to accelerate the computation. Our method displays the shafts of light by accumulating the intensities of streaks of light by using hardware color blending functions. The rendering of caustics is accelerated by making use of a Z-buffer and a stencil buffer. Moreover, by using a shadow mapping technique, our method can display shafts of light and caustics, taking account of shadows due to objects.

关键词： Rendering (computer graphics) Shafts Optical refraction computer graphics Layout Hardware Acceleration Optical buffering computer displays Shadow mapping

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PRICAI 2023: Trends in Artificial Intelligence 1

引用

丛书名： Lecture Notes in computer Science

1000年

作者： Fenrong Liu Arun Anand Sadanandan Duc Nghia Pham Petrus Mursanto Dickson Lukose

ISBN: (数字)9789819970254

ISBN: (纸本)9789819970247

关键词： Artificial Intelligence Computing Milieux computer Systems Organization and Communication Networks computer applications computer Imaging, Vision, Pattern Recognition and graphics

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Animating human face under arbitrary illumination

Animating human face under arbitrary illumination

引用

pacific conference on computer graphics and applications

作者： Tong-Bo Chen Bao-Cai Yin Wan-Jun Huang De-Hui Kong College of Computer Science Beijing Polytechnic University Beijing China

ISBN: (纸本)0769512275

The authors present a method to animate a human face under arbitrary lighting conditions. We first acquire the reflectance models of a human face in various expressions by employing a robot to precisely control the light position. By developing a relighting tool, named LUXMASTER, we achieve great freedom to change the illumination condition and get a variety of photorealistic novel renderings of the human face. Then, we introduce morphing techniques to add the time dimension and produce a clip of facial animation with varying illumination and expression. In order to make the morphing work easily, we design an expressive, intuitive and efficient tool, called FLUIDMAN, which at the same time enables an enormous possibility of visual effects.

关键词： Facial animation Humans Face Lighting Reflectivity computer graphics Solid modeling Application software Mouth Eyes

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General matrix representations for B-splines

General matrix representations for B-splines

引用

pacific conference on computer graphics and applications

作者： Kaihuai Qin Department of Computer Science & Technology Tsinghua University Beijing China

ISBN: (纸本)0818686200

The concept of basis matrix of B-splines is presented. A general matrix representation, which results in an explicitly recursive matrix formula, for nonuniform B-spline curves of an arbitrary degree is also presented by means of Toeplitz matrix. New recursive matrix representations for uniform B-spline curves and Bezier curves of an arbitrary degree are obtained as special cases of that for nonuniform B-spline curves. The recursive formula for basis matrix can be substituted for de Boor-Cox's one for B-splines, and it has better time complexity than de Boor-Cox's formula when used for conversion and computation of B-spline curves and surfaces between different CAD systems. Finally, some applications of the matrix representations are presented.

关键词： Spline Matrices Polynomials computer science Design automation Application software Algorithm design and analysis Sun

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Tight bounding volumes for subdivision surfaces

Tight bounding volumes for subdivision surfaces

引用

pacific conference on computer graphics and applications

作者： L. Kobbelt Computer Science Department University Erlangen-Nuünberg Erlangen Germany

We first demonstrate how to compute exact limit points and tangents for surfaces generated by an arbitrary, stationary subdivision scheme. We then describe how to construct simple bounding volumes for the patches of a subdivision surface and present a simple numerical technique to compute guaranteed bounds for the ranges of the basis functions being associated with the subdivision scheme. Merging the local bounding volumes allows us to generate envelope meshes which tightly enclose the limit surface and which have the same structure as the initial control mesh. The prominent applications for these envelope meshes are the efficient ray tracing of subdivision surfaces as well as efficient collision detection.

关键词： Surface reconstruction Solid modeling Shape Geometry Ray tracing Context modeling Testing computer science Merging Mesh generation

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Rethinking Algorithms for Games: Towards High-Fidelity Effects in Interactive Environments

Rethinking Algorithms for Games: Towards High-Fidelity Effec...

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pacific conference on computer graphics and applications

作者： Dr. Zoran Popovic University of Washington USA

Summary form only given. We argue that real-time domain of interactive games requires completely new approach to algorithms for most problems in computer graphics. To illustrate this point, we describe our recent work on two very different phenomena, human locomotion and fluid simulations, and show how the requirements of high-fidelity, realtime performance and unconditional stability resulted in some very unusual algorithms to these well studied problems.

关键词： Computational modeling Automatic control Optimal control computer graphics Humans Multidimensional systems Application software Stability Reduced order systems Spinning

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