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Template-based rendering of run-length encoded volumes

Template-based rendering of run-length encoded volumes

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pacific conference on computer graphics and applications

作者： Cheol-Hi Lee Yun-Mo Koo Yeong Gil Shin Department of Computer Science Seoul National University Seoul South Korea Department of Computer Engineering Seoul National University Seoul South Korea

ISBN: (纸本)0818680288

Template-based volume rendering is an acceleration technique for volume ray casting. It does not trade-off the image quality for the rendering speed. However, it still falls short of interactive manipulation of volume data, mainly due to the ray-by-ray volume access pattern and the long ray path in the transparent regions. In this paper, we present an object-order template-based volume rendering method that uses run-length encoding to enable the skipping of highly transparent regions. We present three algorithms, one for each principal axis direction. By combining the advantages of object-order volume traversal and run-length encoded volumes, the algorithms achieve high-quality rendering in a much shorter time than the original template-based volume rendering.

关键词： Rendering (computer graphics) Image quality Acceleration Casting Image sampling Data visualization Workstations Gas insulated transmission lines computer science Encoding

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Swirling-sweepers: constant-volume modeling

Swirling-sweepers: constant-volume modeling

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pacific conference on computer graphics and applications

作者： A. Angelidi M.P. Canif G. Wyvill S. King Otago Univ. New Zealand University of Otago New Zealand

Swirling-sweepers is a new method for modeling shapes while preserving volume. The artist describes a deformation by dragging a point along a path. The method is independent of the geometric representation of the shape. It preserves volume and avoids self-intersections, both local and global. It is capable of unlimited stretching and the deformation can be constrained to affect only apart of the model. We argue that all of these properties are necessary for interactive modeling if the user is to have the impression that he or she is shaping a real material. Our method is the first to implement all five.

关键词： Deformable models Shape control computer graphics Animation Optimization methods Context modeling Joining materials Character recognition Animals Humans

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Topology-preserving simplification of 2D nonmanifold meshes with embedded structures

Topology-preserving simplification of 2D nonmanifold meshes ...

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13th pacific conference on computer graphics and applications

作者： Vivodtzev, F Bonneau, GP Le Texier, P INRIA Rhone Alpes INP Genoble CNRS UJFLab GRAVIR F-38334 Saint Ismier France CEA CESTA F-33114 Le Barp France

Mesh simplification has received tremendous attention over the years. Most of the previous work in this area deals with a proper choice of error measures to guide the simplification. Preserving the topological characteristics of the mesh and possibly of data attached to the mesh is a more recent topic and the subject of this paper. We introduce a new topology-preserving simplification algorithm for triangular meshes, possibly nonmanifold, with embedded polylines. In this context, embedded means that the edges of the polylines are also edges of the mesh. The paper introduces a robust test to detect if the collapse of an edge in the mesh modifies either the topology of the mesh or the topology of the embedded polylines. This validity test is derived using combinatorial topology results. More precisely, we define a so-called extended complex from the input mesh and the embedded polylines. We show that if an edge collapse of the mesh preserves the topology of this extended complex, then it also preserves both the topology of the mesh and the embedded polylines. Our validity test can be used for any 2-complex mesh, including nonmanifold triangular meshes, and can be combined with any previously introduced error measure. Implementation of this validity test is described. We demonstrate the power and versatility of our method with scientific data sets from neuroscience, geology, and CAD/CAM models from mechanical engineering.

关键词： computational geometry and its applications LOD techniques multiresolution curves and surfaces

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Opportunities for subdivision-based multiresolution modeling

Opportunities for subdivision-based multiresolution modeling

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pacific conference on computer graphics and applications

作者： P. Schroder Caltech USA

applications in computer graphics, geometric modeling, and simulation based engineering design demand highly flexible and efficient algorithms for the manipulation of large scale, complex geometry. Examples include the acquisition, processing, and transmission of finely tessellated models of real world geometry. These geometries are typically represented as very large meshes ranging into hundreds of thousands if not millions of triangles per object. Since the use of such geometries occurs typically in interactive applications, highly scalable algorithms, which are capable of allocating resources in very flexible ways, are required. Examples include the generation of level-of-detail (LOD) representations with well controlled error or compression of geometry for progressive transmission purposes. These needs have fuelled an active and vibrant research area concerned with the construction and efficient manipulation of multiresolution representations, i.e., data structures and algorithms exhibiting low time and space complexity, capable of providing fluid speed/accuracy trade-offs. There are two distinct approaches in this area, those based on classical subdivision and those based on more recent mesh simplification techniques. We briefly review developments in the area of subdivision modeling and outline some research challenges for the future.

关键词： Solid modeling Application software computer graphics Computational modeling computer simulation Design engineering Algorithm design and analysis Large-scale systems Computational geometry Resource management

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The Mental Canvas: A Tool for Conceptual Architectural Design and Analysis

The Mental Canvas: A Tool for Conceptual Architectural Desig...

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pacific conference on computer graphics and applications

作者： Julie Dorsey Songhua Xu Gabe Smedresman Holly Rushmeier Leonard McMillan Department of Computer Science Yale University USA Department of Computer Science University of North Carolina Chapel Hill USA

We describe a computer graphics system that supports conceptual architectural design and analysis. We use as a starting point the traditional sketchbook drawings that architects use to experiment with various views, sections, and details. Rather than interpret or infer 3D structure from drawings, our system is designed to allow the designer to organize concept drawings in 3D, and gradually fuse a series of possibly geometrically-inconsistent sketches into a set of 3D strokes. Our system uses strokes and planar "canvases" as basic primitives; the basic mode of input is traditional 2D drawing. We introduce methods for the user to control stroke visibility and transfer strokes between canvases. We also introduce methods for the user to position and orient the canvases that have infinite extent. We demonstrate the use of the system to analyze existing structures and conceive new designs.

关键词： Buildings Shape computer graphics computer science Fuses Process design Application software Design automation Geometry Image analysis

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Collision detection for clothed human animation

Collision detection for clothed human animation

引用

pacific conference on computer graphics and applications

作者： Dongliang Zhang M.M.F. Yuen CAD\CAM Center Hong Kong University of Science and Technology Hong Kong China

ISBN: (纸本)0769508685

We present a voxel-based collision detection method for clothed human animation. We speed up the performance of the voxel-based method by choosing an appropriate voxel size and using a fast voxelization approach. Based on the voxel method, we propose a self-collision detection method and a simplified collision detection method. First, the efficiency of self-collision detection is improved by taking advantage of the curvature and multi-layer methods. Second, the efficiency of cloth/human collision detection is improved by introducing auxiliary line segments. Some heuristics are provided to further increase the efficiency of collision detection. Experimental results demonstrate that our method is efficient for clothed human animation.

关键词： Humans Animation Biological system modeling Computational modeling Computational geometry Computational efficiency Detection algorithms Design automation computer graphics Robots

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CSG tree rendering for point-sampled objects

CSG tree rendering for point-sampled objects

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pacific conference on computer graphics and applications

作者： M. Wicke M. Teschner M. Gross ETH Zurich Switzerland

This paper presents an algorithm for rendering of point-sampled CSG models. The approach works with arbitrary CSG trees of surfel models with arbitrary sampling densities. Edges and corners are rendered by reconstructing the involved surfaces separately. The reconstructed surfaces are clipped at intersections. This way, blurring at any magnification is avoided. As opposed to existing methods, which resample surfaces close to object intersections, the proposed approach preserves the original object representation. Since no resampling is needed, dynamic scenes can be handled very flexible. Complex intersections involving any number of objects can be rendered.

关键词： Surface reconstruction Rendering (computer graphics) Sampling methods Layout Geometry Spline Surface texture Reconstruction algorithms Image reconstruction Hardware

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A method to generate wet and broken-up animal fur

A method to generate wet and broken-up animal fur

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pacific conference on computer graphics and applications

作者： A. Bruderlin Sony Pictures Imageworks Culver CA USA

This paper describes part of the pipeline which we have implemented for the creation of hair and fur for the upcoming motion picture "Stuart Little". In particular, we discuss the two effects of producing wet fur and broken-up dry fur. We assume that our animal models consist of a connected set of NURBS patches, which define the skin onto which the individual hairs are placed. A wet fur look is achieved by clumping together of neighboring hairs within certain clumping areas on the skin. The definition of these clumping areas can be either static or animated, the latter to simulate spouts of water hitting parts of the fur coat, making it increasingly wet. A broken-up fur look is generated by breaking of hairs along certain fur-tracks on the skin.

关键词： Animals Hair Skin Spline Surface topography Surface reconstruction Pipelines Animation Motion pictures Rendering (computer graphics)

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Geometric deformation-displacement maps

Geometric deformation-displacement maps

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pacific conference on computer graphics and applications

作者： G. Elber Computer Science Department Technion-Israel Institute of Technology Haifa Israel

Texture mapping, bump mapping, and displacement maps are central instruments in computer graphics aiming to achieve photo-realistic renderings. In all these techniques, the mapping is typically one-to-one and a single surface location is assigned a single texture color, normal, or displacement. Other specialized techniques have also been developed for the rendering of supplementary surface details such as fur hair, or scales. This work presents an extended view of these procedures and allows one to precisely assign a single surface location with few continuously deformed displacements, each with possibly different texture color or normal, employing trivariate functions in a similar way to freeform deformations. As a consequence, an arbitrary regular geometry could be employed as part of the presented scheme as supplementary surface texture details. This work also augments recent results on texturing and parameterization of surfaces of arbitrary topologies by providing more flexible control over the phase of texture modeling. By completely and continuously parameterizing the space above the surface of the object as a trivariate vector function, we are able, in this work, to not only control the mapping of the texture on the surface but also to control this mapping in the volume surrounding the surface.

关键词： Surface texture Rendering (computer graphics) Geometry computer graphics Shape computer science Instruments Hair Topology Casting

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Implitcitizing bi-cubi toric surfaces by dixon alpha-resultant quotients

Implitcitizing bi-cubi toric surfaces by dixon alpha-resulta...

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pacific conference on computer graphics and applications

作者： Mao-Ching Foo Eng-Wee Chionh Computer Science Department National University of Singapore Singapore

ISBN: (纸本)0769520286

Toric surface patches have two significant geometric properties: they are multi-sided and they are generalizations of both the triangular and rectangular Bezier surface patches. They also have a very nice algebraic property: their implicit equations are closely related to the Dixon determinant. In particular, for bi-cubic toric patches without base points, their implicit equation can always be obtained very conveniently using the recently discovered Dixon quotients. In this paper, we explain the relevance of monomial corner cutting to toric patches, and how this leads to their efficient implicitization by the Dixon quotient. Many examples are given to illustrate the simplicity and power of this approach.

关键词： Equations Chromium computer graphics Application software Lattices

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