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Anaglyph Caustics with Motion Parallax

computer graphics FORUM 2016年第7期35卷 343-352页

作者： Lancelle, M. Martin, T. Solenthaler, B. Gross, M. Swiss Fed Inst Technol Dept Comp Sci Zurich Switzerland Disney Res Zurich Zurich Switzerland

In this paper we present a method to model and simulate a lens such that its caustic reveals a stereoscopic 3D image when viewed through anaglyph glasses. By interpreting lens dispersion as stereoscopic disparity, our method optimizes the shape and arrangement of prisms constituting the lens, such that the resulting anaglyph caustic corresponds to a given input image defined by intensities and disparities. In addition, a slight change of the lens' distance to the screen causes a 3D parallax effect that can also be perceived without glasses. Our proposed relaxation method carefully balances the resulting pixel intensity and disparity error, while taking the subsequent physical fabrication process into account. We demonstrate our method on a representative set of input images and evaluate the anaglyph caustics using multi-spectral photon tracing. We further show the fabrication of prototype lenses with a laser cutter as a proof of concept.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.3 [computer graphics]: Three-Dimensional graphics and Realism&mdash Display Algorithms

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Implementation of a graphics design framework on the web 8

Implementation of a graphics design framework on the web

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8th pacific conference on computer graphics and applications

作者： Xie, XY Wang, H Huang, ZY Natl Univ Singapore Sch Comp Singapore 117543 Singapore

ISBN: (纸本)0769508685

We propose a client-server graphics design framework and have implemented a room design system using CORBA. We have integrated technologies used in distributed computation (Java and CORBA) and computer graphics (VRML). To support multiuser collaborative design, we propose a supplier-consumer communication approach and have implemented it using the event service in CORBA. Our system can be applied in Electronic Commerce to improve the existing systems by allowing customers to select furniture and to visualize the whole furnished room in 3D.

关键词： Application software Client-server systems Collaboration computer graphics Data visualization Databases Electronic commerce Java Layout Virtual environment

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Planar Shape Interpolation Based On Teichmuller Mapping

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computer graphics FORUM 2016年第7期35卷 43-56页

作者： Nian, Xianshun Chen, Falai Univ Sci & Technol China Sch Math Sci Hefei 230026 Anhui Peoples R China

Shape interpolation is a classical problem in computer graphics and has been widely investigated in the past two decades. Ideal shape interpolation should be natural and smooth which have good properties such as affine and conformal reproduction, bounded distortion, no fold-overs, etc. In this paper, we present a new approach for planar shape interpolation based on Teichmuller maps - a special type of maps in the class of quasi-conformal maps. The algorithm consists of two steps. In the first step, a Teichmuller map is computed from the source shape to the target shape, and then the Beltrami coefficient is interpolated such that the conformal distortion is linear with respect to the time variable. In the second step, the intermediate shape is reconstructed by solving the Beltrami equation locally over each triangle and then stitching the mapped triangles by conformal transformations. The new approach preserves all the good properties mentioned above and produces more natural and more uniform intermediate shapes than the start-of-the-art methods. Especially, the conformal distortion changes linearly with respect to the time variable. Experiment results show that our method can produce appealing results regardless of interpolating between the same or different objects.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.3 [computer graphics]: Picture/Image Generation&mdash Display Algorithms I.3.7 [computer graphics]: Three-Dimensional graphics and Realism&mdash Animation

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Mesh modelling with curve analogies

Mesh modelling with curve analogies

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12th pacific conference on computer graphics and applications (PG 2004)

作者： Zelinka, S Garland, M Univ Illinois Thomas M Siebel Ctr Comp Sci Urbana IL 61801 USA

ISBN: (纸本)0769522343

Modelling by analogy has become a powerful paradigm for editing images. Using a pair of before- and after-example images of a transformation, a system that models by analogy produces analogous transformations on arbitrary new images. This paper brings the expressive power of modelling by analogy to meshes. To avoid the difficulty of specifying fully 3D example meshes, we use Curve Analogies to produce changes in meshes. We apply analogies to families of curves on an object's surface, and use the filtered curves to drive a transformation of the object. We demonstrate a range of filters, from simple local feature elimination/addition, to more general frequency enhancement filters.

关键词： Interactive computer graphics

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Bounding recursive procedural models using convex optimization 11

Bounding recursive procedural models using convex optimizati...

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11th pacific conference on computer graphics and applications

作者： Lawlor, OS Hart, JC Univ Illinois Dept Comp Sci Urbana IL 61801 USA

ISBN: (纸本)0769520286

We present an algorithm to construct a tight bounding polyhedron for a recursive procedural model. We first use an iterated function system (IFS) to represent the extent of the procedural model. Then we present a novel algorithm that expresses the IFS-bounding problem as a set of linear constraints on a linear objective function, which can then be solved via standard techniques for linear convex optimization. As such, our algorithm is guaranteed to find the recursively optimal bounding polyhedron, if it exists. Finally, we demonstrate examples of this algorithm on two and three dimensional recursive procedural models.

关键词： computer graphics computer science Constraint optimization Fractals Geometry Layout Shape Solid modeling Testing Tree graphs

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Decoupled Space and Time Sampling of Motion and Defocus Blur for Unified Rendering of Transparent and Opaque Objects

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computer graphics FORUM 2016年第7期35卷 441-450页

作者： Widmer, S. Wodniok, D. Thul, D. Guthe, S. Goesele, M. Tech Univ Darmstadt Grad Sch Computat Engn Darmstadt Germany Tech Univ Darmstadt Darmstadt Germany

We propose a unified rendering approach that jointly handles motion and defocus blur for transparent and opaque objects at interactive frame rates. Our key idea is to create a sampled representation of all parts of the scene geometry that are potentially visible at any point in time for the duration of a frame in an initial rasterization step. We store the resulting temporally-varying fragments (t-fragments) in a bounding volume hierarchy which is rebuild every frame using a fast spatial median construction algorithm. This makes our approach suitable for interactive applications with dynamic scenes and animations. Next, we perform spatial sampling to determine all t-fragments that intersect with a specific viewing ray at any point in time. Viewing rays are sampled according to the lens uv-sampling for depth-of-field effects. In a final temporal sampling step, we evaluate the predetermined viewing ray/t-fragment intersections for one or multiple points in time. This allows us to incorporate all standard shading effects including transparency. We describe the overall framework, present our GPU implementation, and evaluate our rendering approach with respect to scalability, quality, and performance.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.6 [computer graphics]: Methodology and Techniques&mdash graphics data structures and data types I.3.7 [computer graphics]: Three-Dimensional graphics and Realism&mdash Raytracing

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Simulation of peeling using 3D-surface cellular automata 9

Simulation of peeling using 3D-surface cellular automata

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9th pacific conference on computer graphics and applications (pacific graphics 01)

作者： Gobron, S Chiba, N Iwate Software Ctr Morioka Iwate 0200045 Japan

ISBN: (纸本)0769512275

This paper describes a method for modeling the natural peeling phenomenon over any 3D surface. Using crack input data-precomputed with a semi-physical solution-this method allows simulating peeling on any type of triangulated 3D object. Our model's main advantage is that it proposes an method that is intuitive enough to make it easy to understand and convenient to apply, user controllable, and easily extensible-especially to simultaneous natural phenomena We first introduce the general development of peeling over various materials. Then, we present how to define groups of peeling, how to determine a realistic and natural peeling order and how to simulate the rendering of two types of special peelings. Finally, a set of graphical results concludes the paper presenting a series of direct peeling and curling patterns using classical paintings or plastic-paintings simulated materials.

关键词： computer graphics cellular automaton 3DSCA peeling surface simulation multi-layer modeling natural phenomena

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Interactive simulation of fire 10

Interactive simulation of fire

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10th pacific conference on computer graphics and applications

作者： Melek, Z Keyser, J Texas A&M Univ Dept Comp Sci College Stn TX 77843 USA

ISBN: (纸本)0769517846;0769517854

In this paper we describe a fast and interactive model to simulate and control the fire phenomenon. We use a modified interactive fluid dynamics solver to describe the motion of a 3-gas system. We simulate the motion of oxidizing air, fuel gases, and exhaust gases. The burning process is simulated by consuming fuel and air based on the amounts of fuel and air inside each grid cell. By modeling heat distribution, we also simulate the spread of fire to and self-ignition in other combustible solids.

关键词： Combustion Computational modeling computer graphics computer science computer simulation Fires Fluid dynamics Fuels Gases Solid modeling

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Interactive construction of multi-segment curved handles 10

Interactive construction of multi-segment curved handles

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10th pacific conference on computer graphics and applications

作者： Srinivasan, V Akleman, E Chen, JE Texas A&M Univ Visualizat Sci Program College Stn TX 77843 USA

ISBN: (纸本)0769517846;0769517854

In this work, we present a method to interactively create multi-segment, curved handles between two star-shaped faces of an orientable 2-manifold mesh or to connect two 2-manifold meshes along such faces. The presented algorithm combines a very simple 2D morping algorithm with a Hermite interpolation to construct the handle. Based on the method, we have developed a user interface tool that allows users to simply and easily create multi-segment curved handles.

关键词： Algorithm design and analysis Application software computer graphics computer science Interpolation Joining processes Mathematical model Shape User interfaces Visualization

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High-resolution 360 Video Foveated Stitching for Real-time VR

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computer graphics FORUM 2017年第7期36卷 115-123页

作者： Lee, Wei-Tse Chen, Hsin-I Chen, Ming-Shiuan Shen, I-Chao Chen, Bing-Yu Natl Taipei Univ New Taipei Taiwan Tesla Inc Palo Alto CA USA

In virtual reality (VR) applications, the contents are usually generated by creating a 360 degrees Video panorama of a real-world scene. Although many capture devices are being released, getting high-resolution panoramas and displaying a virtual world in real-time remains challenging due to its computationally demanding nature. In this paper, we propose a real-time 360 degrees Video foveated stitching framework, that renders the entire scene in different level of detail, aiming to create a high-resolution panoramic Video in real-time that can be streamed directly to the client. Our foveated stitching algorithm takes Videos from multiple cameras as input, combined with measurements of human visual attention (i.e. the acuity map and the saliency map), can greatly reduce the number of pixels to be processed. We further parallelize the algorithm using GPU to achieve a responsive interface and validate our results via a user study. Our system accelerates graphics computation by a factor of 6 on a Google Cardboard display.

关键词： Categories and Subject Descriptors (according to ACM CCS) I.3.3 [computer graphics]: Picture/Image Generation—Line and curve generation

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