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Voxel-space ambient occlusion

Rajeev Penmatsa, Greg Nichols, Chris Wyman
2010 Proceedings of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games - I3D 10  
REPORT Voxel-Space Ambient Occlusion 14. ABSTRACT 16. SECURITY CLASSIFICATION OF: Ambient occlusion adds important detail to a scene.  ...  This paper presents a multiresolution screen-space voxel based ambient occlusion technique, which improves G-buffer based techniques, avoiding artifacts such as haloing.  ...  Reinbothe et al [RBA09] computed ambient occlusion by tracing rays in a voxel grid and filtering the occlusion result in screen space.  ... 
doi:10.1145/1730804.1730989 dblp:conf/si3d/PenmatsaNW10 fatcat:lfwmmy6awfclnix7h3dhh5ffzu

Pre-integrated deferred subsurface scattering

Xi M. Chen, Timothy Lambert, Eric Penner
2014 ACM SIGGRAPH 2014 Posters on - SIGGRAPH '14  
Screen-space ambient occlusion must address a similar problem, so any blur methods used there may be applied here.  ...  Figure 6 : 6 Comparison between a) curvature-based ambient occlusion (CDAO) using our WLSD algorithm for curvature, and b) NVIDIA's implementation of horizon-based ambient occlusion (HBAO).  ... 
doi:10.1145/2614217.2614248 dblp:conf/siggraph/ChenLP14 fatcat:gn3ns4444ngrpcrxlzm6rjip4e

Real-time Surface Analysis and Tagged Material Cleansing for Virtual Colonoscopy [article]

Christoph Russ, Christoph Kubisch, Feng Qiu, Wei Hong, Patric Ljung
2010 International Workshop on Volume Graphics, Proceedings of the  
We show how to convert a standard mono-resolution representation into a out-of-core multiresolution structure, both for labeled and continuous scalar volumes.  ...  This representation has little overhead over storing precomputed gradients, and has the advantage that feature planes provide minimal geometric information about the underlying volume regions that can  ...  Center: Ambient occlusion generated from depth map in screen space. Right: Screen space ambient occlusion applied to final compositing.  ... 
doi:10.2312/vg/vg10/029-036 fatcat:kjchpz6ehneahjpd4ogvnu4pmu

GPU curvature estimation on deformable meshes

Wesley Griffin, Yu Wang, David Berrios, Marc Olano
2011 Symposium on Interactive 3D Graphics and Games on - I3D '11  
We demonstrate our algorithm with curvature-based NPR feature lines and a curvature-based approximation for ambient occlusion.  ...  The middle is using surface curvature to approximate ambient occlusion.  ...  Approximating Ambient Occlusion One application of estimated curvature is to approximate ambient occlusion.  ... 
doi:10.1145/1944745.1944772 dblp:conf/si3d/GriffinWBO11 fatcat:4qwxlxuucfbsdhzclf7weu3w4q

Real-time rendering of subsurface scattering according to translucency magnitude

Hiroyuki Kubo, Kohe Tokoi, Yasuhiro Mukaigawa
2015 ACM SIGGRAPH 2015 Posters on - SIGGRAPH '15  
Yasuhiro Mukaigawa NAIST (a) Lambert (b) Curvature-based (c) Our method (d)Trans. Magnitude Figure 1: Examples of the bunny made of blue jewel Figure 2: Light transport  ...  , and the ambient occlusion at the location s on the surface, respectively.  ...  The screen space subsurface scattering (SSSS) is developed by Jimenez et al. [2009] , yet the speed of rendering is not very practical for low-end computational environment, because screen space techniques  ... 
doi:10.1145/2787626.2792616 dblp:conf/siggraph/KuboTM15 fatcat:mifmzzc67fcife6jakwxweivcu

Screen-Space Ambient Occlusion Using Summed-Area Table
サムドエリアテーブルを用いたスクリーン空間環境遮蔽手法

Marcos Slomp, Michihiro Mikamo, Toru Tamaki, Kazufumi Kaneda
2012 The Journal of the Institute of Image Electronics Engineers of Japan  
Recently, screen-space ambient occlusion techniques started to flourish, and are now the de facto standard for real-time dynamic shadow synthesis.  ...  The contributions of this work are two-folded: a variation of screen-space ambient occlusion that uses Summed-Area Tables, yielding satisfactory results yet performing better than previous attempts, and  ...  この計算時間の向上は SAT の GPU への親和性によるも のである.すなわち,ストリーム処理とコヒーレントなメモ リアクセスにより,単位時間当たりのテクスチャキャッシュ Comparative results with ambient occlusion and shading 表 1 SSAO による計算速度の比較結果. 7 7 の作成に recursive doubling 手法を 使用  ... 
doi:10.11371/iieej.41.332 fatcat:vumhivaa2bgvli6etkinil3cqq

Interactive Generation of (Paleontological) Scientific Illustrations from 3D-models [article]

Sebastian Schäfer, Christoph Knopp, Detlef Krömker
2012 Spanish Computer Graphics Conference  
The user can choose the techniques used to render each layer and manipulate its key aspects. Using 3D- and 2D-painting the artist can still interact with the result and adjust it to his or her liking.  ...  Scientific illustrations play an important role in the paleontological domain and are complex illustrations that are manually drawn.  ...  Krister Smith and Juliane Eberhardt from Senckenberg Research Institute and Natural History Museum Frankfurt for their expert opinions, support and provided materials.  ... 
doi:10.2312/localchapterevents/ceig/ceig12/109-112 dblp:conf/ceig/SchaferKK12 fatcat:ekbnhlm7erdxzmydjto2mkusye

Ambient Occlusion Effects for Combined Volumes and Tubular Geometry

M. Schott, T. Martin, A. V. P. Grosset, S. T. Smith, C. D. Hansen
2013 IEEE Transactions on Visualization and Computer Graphics  
This paper details a method for interactive direct volume rendering that computes ambient occlusion effects for visualizations that combine both volumetric and geometric primitives, specifically tube-shaped  ...  occlusion between structures represented by a volume or geometry.  ...  [20] combine image space and object space techniques to compute ambient occlusion effects that also consider geometry not rasterized using other screen space ambient occlusion methods.  ... 
doi:10.1109/tvcg.2012.306 pmid:23559506 pmcid:PMC3987773 fatcat:wijmdjhjzfdxbhdveigom7ffii

Efficient methods for ambient lighting

Tamás Umenhoffer, Balázs Tóth, László Szirmay-Kalos
2009 Proceedings of the 2009 Spring Conference on Computer Graphics - SCCG '09  
Our model is physically based and thus can not only provide better results than empirical ambient occlusion techniques at the same cost, but also reveals where tradeoffs can be found between accuracy and  ...  This paper presents a model and algorithms for the reflection of the ambient light.  ...  Acknowledgement This work has been supported by the National Office for Research and Technology and by OTKA K-719922 (Hungary).  ... 
doi:10.1145/1980462.1980482 dblp:conf/sccg/UmenhofferTS09 fatcat:zkuudbttdvc7fj3nbin3f3jvce

Splatting indirect illumination

Carsten Dachsbacher, Marc Stamminger
2006 Proceedings of the 2006 symposium on Interactive 3D graphics and games - SI3D '06  
We describe an implementation on contemporary graphics hardware, show a comparison to previous approaches, and present adaptation to and results in game-typical applications.  ...  In this paper we present a novel method for plausible real-time rendering of indirect illumination effects for diffuse and non-diffuse surfaces.  ...  the ambient occlusion term.  ... 
doi:10.1145/1111411.1111428 dblp:conf/si3d/DachsbacherS06 fatcat:hiqaho7dmjgbndxyhefwusewmq

The Occlusion Spectrum for Volume Classification and Visualization

C. Correa, Kwan-Liu Ma
2009 IEEE Transactions on Visualization and Computer Graphics  
In this paper, we present a new method for classifying volume data based on the ambient occlusion of voxels.  ...  In general, the ambient occlusion of a voxel can be interpreted as a weighted average of the intensities in a spherical neighborhood around the voxel.  ...  National Science Foundation through grants CCF-0911422, OCI-0325934, OCI-0749227, and OCI-0850566, and the U.S. Department of Energy through the SciDAC program with Agreement No. DE-FC02-06ER25777.  ... 
doi:10.1109/tvcg.2009.189 pmid:19834222 fatcat:4bxzgt4vlnaaxglizfpj2yrdbu

Deep Medial Fields [article]

Daniel Rebain, Ke Li, Vincent Sitzmann, Soroosh Yazdani, Kwang Moo Yi, Andrea Tagliasacchi
2021 arXiv   pre-print
an efficient approximation of ambient occlusion that remains stable with respect to viewpoint variations.  ...  In particular, the medial field encodes the local thickness of a 3D shape, and enables O(1) projection of a query point onto the medial axis.  ...  This work was supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant, NSERC Collaborative Research and Development Grant, Google, Compute Canada, and Advanced  ... 
arXiv:2106.03804v1 fatcat:fgchknabinhztnmb6t2qmkqnxm

Deferred Hybrid Path Tracing [chapter]

Thomas Willberger, Clemens Musterle, Stephan Bergmann
2019 Ray Tracing Gems  
We reduce the number of traced rays by trying to find an intersection in screen space and reuse information from previous frames via reprojection and filtering.  ...  Our techniques require no manual preprocessing and only a few seconds of precomputation.  ...  ACKNOWLEDGMENTS We thank Tomasz Stachowiak and the editors for their valuable input, corrections, and suggestions that greatly improved this chapter.  ... 
doi:10.1007/978-1-4842-4427-2_26 fatcat:zrrzwx2gjrh2dmrgamixzr46bi

View-dependent displacement mapping

Lifeng Wang, Xi Wang, Xin Tong, Stephen Lin, Shimin Hu, Baining Guo, Heung-Yeung Shum
2003 ACM Transactions on Graphics  
Abstract Significant visual effects arise from surface mesostructure, such as fine-scale shadowing, occlusion and silhouettes.  ...  Unlike traditional displacement mapping, VDM allows for efficient rendering of selfshadows, occlusions and silhouettes without increasing the complexity of the underlying surface mesh.  ...  effect using an ambient illumination term.  ... 
doi:10.1145/882262.882272 fatcat:2ccvmke32zbdxcesqpb23v57j4

High-quality spatio-temporal rendering using semi-analytical visibility

Carl Johan Gribel, Rasmus Barringer, Tomas Akenine-Möller
2011 ACM Transactions on Graphics  
Our work focuses on spatio-temporal visibility, and for 49 samples it takes 3.8 seconds to compute visibility and simple shading (ambient occlusion not included) at 1024 × 768 pixels.  ...  We also demonstrate that our algorithm, with some adjustments, can be used to accurately compute motion blurred ambient occlusion.  ...  grant from the Knut and Alice Wallenberg Foundation.  ... 
doi:10.1145/2010324.1964949 fatcat:5q35znu3rffmhiwvmfhnmxr64i
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