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检索条件"任意字段=18th ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games, I3D 2014"

共 8 条记录，以下是1-10 订阅

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Proceedings of the 18th Meeting of the acm siggraph symposium on interactive 3d graphics and games, i3d 2014

Proceedings of the 18th Meeting of the ACM SIGGRAPH Symposiu...

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18th acm siggraph symposium on interactive 3d graphics and games, i3d 2014

ISBN: (纸本)9781450327176

the proceedings contain 24 papers. the topics discussed include: fracture animation based on high-dimensional Voronoi diagrams;sound localization and multi-modal steering for autonomous virtual agents;stochastic activity authoring with direct user control;dynamic radial view based culling for continuous self-collision detection;scheduling in heterogeneous computing environments for proximity queries;a GPU accelerated algorithm for 3d delaunay triangulation;fast rotation search for real-time interactive point cloud registration;a hybrid image-CAd based system for modeling realistic hairstyles;hybrid computational voxelization using the graphics pipeline;T-ReX: interactive global illumination of massive models on heterogeneous computing resources;efficient virtual shadow maps for many lights;per-triangle shadow volumes using a view-sample cluster hierarchy;real-time low-frequency signal modulated texture compression using intensity dilation;and interactive 3d cloud modelling with a brush painting interface.

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RGB-d iBR: Rendering indoor Scenes Using Sparse RGB-d images with Local Alignments 16

RGB-D IBR: Rendering Indoor Scenes Using Sparse RGB-D Images...

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20th acm siggraph symposium on interactive 3d graphics and games (i3d)

作者： Jeong, Yeongyu Kim, Haejoon Seo, Hyewon Cordier, Frederic Lee, Seungyong POSTECH Pohang Si Gyeongsangbuk D South Korea Univ Strasbourg Strasbourg France Univ Haute Alsace Mulhouse France

ISBN: (纸本)9781450340434

this paper presents an image-based rendering (iBR) system based on RGB-d images. the input of our system consists of RGB-d images captured at sparse locations in the scene and can be expanded by adding new RGB-d images. the sparsity of RGB-d images increases the usability of our system as the user need not capture a RGB-d image stream in a single shot, which may require careful planning for a hand-held camera. Our system begins with a single RGB-d image and images are incrementally added one by one. For each newly added image, a batch process is performed to align it with previously added images. the process does not include a global alignment step, such as bundle adjustment, and can be completed quickly by computing only local alignments of RGBd images. Aligned images are represented as a graph, where each node is an input image and an edge contains relative pose information between nodes. A novel view image is rendered by picking the nearest input as the reference image and then blending the neighboring images based on depth information in real time. Experimental results with indoor scenes using Microsoft Kinect demonstrate that our system can synthesize high quality novel view images from a sparse set of RGB-d images.

关键词： image-based rendering RGB-d images local alignment 3d navigation

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interactive 3d cloud modelling with a brush painting interface 14

Interactive 3D cloud modelling with a brush painting interfa...

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18th acm siggraph symposium on interactive 3d graphics and games, i3d 2014

作者： Wei, Chen Gain, James Marais, Patrick University of Cape Town South Africa

Motivated by traditional Chinese landscape painting, in which a single brush and a single colour are used to paint a vivid landscape, we propose a new painting interface for volumetric cloud modelling.

ISBN: (纸本)9781450327176

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Splatting lines: An efficient method for illustrating 3d surfaces and volumes 14

Splatting lines: An efficient method for illustrating 3D sur...

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18th acm siggraph symposium on interactive 3d graphics and games, i3d 2014

作者： Zhang, Long Sun, Qian He, Ying Hangzhou Dianzi University China Nanyang Technological University Singapore

ISBN: (纸本)9781450327176

While 3d line drawing techniques have become well established in the past decade, most are only suitable for polygonal meshes. this paper presents splatting lines, a unified framework for generating line drawings from various types of 3d models, including point clouds, volumes, and polygonal meshes. in contrast to the existing mesh-based approaches, our method takes a densely sampled point cloud as input. it renders two diffuse shading images using splatting with different parameters and then generates line drawings by subtracting these images. Our point-based approach can be easily extended to polygonal meshes and volumes by an efficient (iso-)surface sampling method. Our method is highly efficient and it does not require any pre-computation. it is also more robust to the mesh tessellation than existing mesh-based techniques. Experimental results indicate the advantages of our method in terms of both performance and quality Copyright © acm.

关键词： interactive computer graphics

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FORK-1S: interactive compliant mechanisms with parallel state computation 14

FORK-1S: Interactive compliant mechanisms with parallel stat...

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18th acm siggraph symposium on interactive 3d graphics and games, i3d 2014

作者： Andrews, Sheldon Teichmann, Marek Kry, Paul G. McGill University Canada CM Labs Simulations United States

ISBN: (纸本)9781450327176

We present a method for the simulation of compliant, articulated structures using a plausible approximate model that focuses on modeling endpoint interaction. We approximate the structure's behavior about a reference configuration, resulting in a first order reduced compliant system, or FORK -1S. Several levels of approximation are available depending on which parts and surfaces we would like to have interactive contact forces, allowing various levels of detail to be selected. Our approach is fast and computation of the full structure's state may be parallelized. Our approach is suitable for stiff, articulate grippers, such as those used in robotic simulation, or physics based characters under static proportional derivative control. We demonstrate that simulations with our method can deal with kinematic chains and loops with non-uniform stiffness across joints, and that it produces plausible effects due to stiffness, damping, and inertia. Copyright © acm.

关键词： Stiffness

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Texture mapping for 3d painting using geodesic distance 14

Texture mapping for 3D painting using geodesic distance

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18th acm siggraph symposium on interactive 3d graphics and games, i3d 2014

作者： Xu, Songgang Keysery, John Texas A and M University United States

ISBN: (纸本)9781450327176

3d modeling systems form the basis for many of the most widely used graphics applications. Although interfaces have long provided the ability to paint directly on a 3d model, the colors are usually stored in a 2d domain, such as in a texture map. despite its widespread use and several advantages, texture mapping has several shortcomings in the context of 3d painting. 3d painting usually requires only a local surface parameterization, while many parameterization methods are global and cannot be applied directly for 3d paints. the computing cost can be too high for realtime parameterization and obvious texture distortions can arise. One of the key works to address these shortcomings is by Schmidt et al. [Schmidt et al. 2006] on decal compositing, who provided an efficient local parameterization for 3d painting. they try to minimize the distortion of textures by approximating the exponential map. However, their work still has many limitations on 3d paintings. their local parameterization method relies on the topology of the local mesh structure, which implies that this method is not stable on different mesh topologies that represent the same geometric shape. Experimental examples showed particular problems when models include large numbers of sliver triangles. due to the sensitivity to the mesh topology, there is not an error bound between their approximation and the exponential mapping. While their method works well in many standard situations, the limitations can cause significant texture distortion in other cases.

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Fast rotation search for real-time interactive point cloud registration 14

Fast rotation search for real-time interactive point cloud r...

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18th acm siggraph symposium on interactive 3d graphics and games, i3d 2014

作者： Chin, Tat-Jun Parra Bustos, Álvaro Brown, Michael S. Suter, david School of Computer Science University of Adelaide Australia School of Computing National University of Singapore Singapore

ISBN: (纸本)9781450327176

Our goal is the registration of multiple 3d point clouds obtained from LidAR scans of underground mines. Such a capability is crucial to the surveying and planning operations in mining. Often, the point clouds only partially overlap and initial alignment is unavailable. Here, we propose an interactive user-assisted point cloud registration system. Guided by the system, the user's role is simply to identify and search for overlapping regions across the point clouds. Specifically, given two point sets, the user clicks on a point in one set, then simply hovers the mouse on the other set to find a matching point. Each mouse position gives rise to a translation, and our system instantly optimises the rotation that aligns the point clouds. Assuming that each individual point set is horizontally levelled with the ground by the level compensator on the LidAR device, given a candidate 3d translation only one angular parameter needs to be estimated to rotationally align two 3d point sets. We propose a fast rotation search algorithm that delivers globally optimal results in real time. Our method conducts branch-and-bound optimisation with a novel bounding function whose evaluation amounts to simple sorted array operations. this provides smooth and accurate feedback to the user's search for overlapping regions. Our system is intuitive and helps to accelerate the registration of multiple scans. Copyright © acm.

关键词： Rotation

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A GPU accelerated algorithm for 3d delaunay triangulation 14

A GPU accelerated algorithm for 3D Delaunay triangulation

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18th acm siggraph symposium on interactive 3d graphics and games, i3d 2014

作者： Cao, thanh-Tung Nanjappa, Ashwin Gao, Mingcen Tan, Tiow-Seng National University of Singapore Singapore Bioinformatics Institute Singapore

ISBN: (纸本)9781450327176

We propose the first algorithm to compute the 3d delaunay triangulation (dT) on the GPU. Our algorithm uses massively parallel point insertion followed by bilateral flipping, a powerful local operation in computational geometry. Although a flipping algorithm is very amenable to parallel processing and has been employed to construct the 2d dT and the 3d convex hull on the GPU, to our knowledge there is no such successful attempt for constructing the 3d dT. this is because in 3d when many points are inserted in parallel, flipping gets stuck long before reaching the dT, and thus any further correction to obtain the dT is costly. in contrast, we show that by alternating between parallel point insertion and flipping, together with picking an appropriate point insertion order, one can still obtain a triangulation very close to delaunay. We further propose an adaptive star splaying approach to subsequently transform this result into the 3d dT efficiently. in addition, we introduce several GPU speedup techniques for our implementation, which are also useful for general computational geometry algorithms. On the whole, our hybrid approach, with the GPU accelerating the main work of constructing a near-delaunay structure and the CPU transforming that into the 3d dT, outperforms all existing sequential CPU algorithms by up to an order of magnitude, in both synthetic and real-world inputs. We also adapt our approach to the 2d dT problem and obtain similar speedup over the best sequential CPU algorithms, and up to 2 times over previous GPU algorithms. Copyright © acm.

关键词： graphics processing unit

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