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Rapid Shadow Generation in Real-World Lighting Environments [article]

Simon Gibson, Jon Cook, Toby Howard, Roger Hubbold
2003 Symposium on Rendering  
We propose a new algorithm that uses consumer-level graphics hardware to render shadows cast by synthetic objects and a real lighting environment.  ...  Examples of the proposed technique are given for a variety of different lighting environments, and the visual fidelity of images generated by our algorithm is compared to both real photographs and synthetic  ...  The bunny model used in Figure 7 is available from the Stanford 3D Scanning Repository.  ... 
doi:10.2312/egwr/egwr03/219-229 fatcat:kvvfquepyvhujbwh3wdlqh3l2y

Estimating Illumination Distribution to Generate Realistic Shadows in Augmented Reality

2015 KSII Transactions on Internet and Information Systems  
Experiment results demonstrate that the proposed methods generate natural image with multiple smooth shadows in real-time.  ...  In the first method, we extract the lighting direction and intensity from input images captured with a front-side camera of a mobile device, using its orientation sensor.  ...  Therefore, it cannot analyze multiple shadows generated by many light sources in real world.  ... 
doi:10.3837/tiis.2015.06.018 fatcat:c6xj55i32favpjpycwnx3lifrq

TOWARDS A REALISTIC MARKER-BASED AUGMENTED REALITY SCENE: ISSUES AND PROSPECTIVE ASPECT

Hasan Alhajhamad, Mohd Shahrizal Sunar
2015 Jurnal Teknologi  
In order to view the real world with additional computer-generated information in a seamless and realistic integration, there are several research challenges that can be identified; some related to camera  ...  Thus, in order to realize the AR scene in a more realistic way, there are four main issues; light source detection, well-designed virtual objects that can have true reflex of the real environment, then  ...  is rapid.  ... 
doi:10.11113/jt.v75.4976 fatcat:jnkulr3vbrbbhpgczcpu6h7sae

Interactive Rendering with Real-World Illumination [chapter]

Simon Gibson, Alan Murta
2000 Eurographics  
We present a new procedure for approximating shadows cast by the real-world illumination using standard hardwarebased shadow mapping, and a novel image composition algorithm that uses frame-buffer hardware  ...  Recently developed image-based methods are used to capture real-world illumination, and sphere-mapping is used illuminate and render the synthetic objects.  ...  This research was supported by EPSRC grant number GR/M14531, entitled 'REVEAL: Reconstruction of Virtual Environments with Accurate Lighting'.  ... 
doi:10.1007/978-3-7091-6303-0_33 fatcat:ns7fatxupvfuppdnmib3om34y4

Deferred shadowing for real-time rendering of dynamic scenes under environment illumination

Naoki Tamura, Henry Johan, Tomoyuki Nishita
2005 Computer Animation and Virtual Worlds  
In this paper, we propose a method for rendering photorealistic animations of dynamic scenes under environment illumination in real time.  ...  Environment illumination, which is a complex and distant lighting environment represented by images is often applied to create photo-realistic images.  ...  Introduction Generating photo-realistic animations in real time is one of the most challenging issues in computer graphics.  ... 
doi:10.1002/cav.108 fatcat:fspqfxqetzd4diy5hrhpc4hl4u

Photorealism or/and non-photorealism in augmented reality

Michael Haller
2004 Proceedings of the 2004 ACM SIGGRAPH international conference on Virtual Reality continuum and its applications in industry - VRCAI '04  
Consequently, virtual scenes can be rendered in a very good quality integrating dynamic behavior, real-time shadows, bump mapped surfaces and other photorealistic rendering techniques.  ...  An integration in an AR environment is the logical consequence. In this paper we present an AR framework that uses photorealistic rendering as well as non-photorealistic rendering techniques.  ...  In contrast to [Bimber et al. 2003 ], we identify four different types of shadow in an AR environment. This fact results because of merging the virtual lights with the real lights.  ... 
doi:10.1145/1044588.1044627 dblp:conf/vrcai/Haller04 fatcat:hmxtmnmelvdpbkmdb6yijadiom

A Context-Aware Method for Authentically Simulating Outdoors Shadows for Mobile Augmented Reality

Joao Barreira, Maximino Bessa, Luis Barbosa, Luis Magalhaes
2018 IEEE Transactions on Visualization and Computer Graphics  
To achieve this seamless integration, actual light conditions must be determined in real time to ensure that virtual objects are correctly illuminated and cast consistent shadows.  ...  The results illustrated that our method can generate visually credible AR scenes with consistent shadows rendered from recovered illumination.  ...  project REC I/EEI-SII/0360/2012 "MASSIVE -Multimodal Acknowledgeable MultiSenSorial Immersive Virtual Environments".  ... 
doi:10.1109/tvcg.2017.2676777 pmid:28278470 fatcat:6qlhgdf7zrfnzowiv6u2zd7kie

Interactive virtual relighting of real scenes

C. Loscos, G. Drettakis, L. Robert
2000 IEEE Transactions on Visualization and Computer Graphics  
These replace the original scene textures which contained real light effects such as shadows from real lights.  ...  ., light interactions between real and virtual objects, including shadows and relighting (real and virtual light source modification).  ...  Acknowledgments This work was funded in part by the Reactive LTR Project ARCADE (#24944) of the European Union. We would like to thank Sylvain Bougnoux for providing the TotalCalib system.  ... 
doi:10.1109/2945.895874 fatcat:bzmc6hg3hzf53iucm6wbpxkyom

3D Computer Graphics and Virtual Reality [chapter]

Branislav Sobota, Miriama Mattová
2022 3D Computer Graphics [Working Title]  
The chapter presents some graphical features used in an environment as well as an explanation of good design practice.  ...  environment.  ...  Acknowledgements This work has been supported by the Operational Programme Integrated Infrastructure in a frame of the project: Intelligent systems for UAV real-time 3D Computer Graphics  ... 
doi:10.5772/intechopen.102744 fatcat:a6i4lra5lncjxlmlk7paroe2by

Projective Illumination Technique in Unprepared Environments for Augmented Reality Applications [chapter]

Giovanni Cagalaban, Seoksoo Kim
2010 Communications in Computer and Information Science  
Our framework aims to lead AR applications in unprepared environments with projective illumination regardless of the movement of real objects, lights and cameras.  ...  environment, such as in outdoor applications.  ...  Acknowledgment This paper has been supported by the 2010 Preliminary Technical Founders Project Fund in the Small and Medium Business Administration.  ... 
doi:10.1007/978-3-642-16444-6_3 fatcat:2vxmbcrvivcb7d7zccxwudgxdy

Interactive Virtual Relighting and Remodeling of Real Scenes [chapter]

Céline Loscos, Marie-Claude Frasson, George Drettakis, Bruce Walter, Xavier Granier, Pierre Poulin
1999 Eurographics  
A filtering process is used to compensate for inaccuracies, and per image reflectances are averaged to generate an approximate reflectance image for the given viewpoint, removing shadows in the process  ...  As an alternative, we present an interactive system to virtually modify the lighting and geometry of scenes with both real and synthetic objects, including mixed real/virtual lighting and shadows.  ...  A second example of real object removal is shown in Fig. 7 . In the context of an interior redesign, we may want to remove doors for example, which is hard to do in the real world.  ... 
doi:10.1007/978-3-7091-6809-7_29 fatcat:in23q2x6b5cnbkshce4yj7vrnq

Classification of Illumination Methods for Mixed Reality [article]

Katrien Jacobs, Céline Loscos
2004 Eurographics State of the Art Reports  
In this paper, we propose a classification of illumination methods for MR applications that aim at generating a merged environment in which illumination and shadows are consistent.  ...  A mixed reality (MR) represents an environment composed both by real and virtual objects.  ...  They created a rapid shadow generation algorithm to calculate and visualize the shadows in a scene after the material properties of the scene are calculated.  ... 
doi:10.2312/egst.20041027 fatcat:lt7rdchbvvbrhlpquwuattbj6y

Classification of Illumination Methods for Mixed Reality

Katrien Jacobs, Celine Loscos
2006 Computer graphics forum (Print)  
This paper proposes a classification of illumination methods for MR applications that aim at generating a merged environment in which illumination and shadows are consistent.  ...  A mixed reality (MR) represents an environment composed both by real and virtual objects.  ...  They created a rapid shadow generation algorithm to calculate and visualize the shadows in a scene after the material properties of the scene are calculated.  ... 
doi:10.1111/j.1467-8659.2006.00816.x fatcat:mcc4xiwf2jdeblcgn4t36kjbhe

Real-Time Visual Simulation And Interactive Animation Of Shadow Play Puppets Using Opengl

Tan Kian Lam, Abdullah Zawawi Bin Haji Talib, Mohd. Azam Osman
2008 Zenodo  
This paper describes a method of modeling to model shadow play puppet using sophisticated computer graphics techniques available in OpenGL in order to allow interactive play in real-time environment as  ...  Special effects such as lighting and blurring effects for virtual shadow play environment are also developed.  ...  By taking the advantage of various computer graphics techniques available in OpenGL a variety of lighting and special effects are generated for virtual shadow play environment.  ... 
doi:10.5281/zenodo.1333856 fatcat:uxrsmebcsjaczoaf2awlhqekcm

Circadian Clocks: Evolution in the Shadows

Martha Merrow, Marc F.P.M. Maas
2009 Current Biology  
EPFL Circadian Clocks: Evolution in the Shadows As scientists, we strive for highly controlled conditions. The real world, however, is noisy.  ...  The scene here shows pictures taken within several minutes on a day in March 2009 in the Netherlands, illustrating the noisy light environment. [2] generated with simple, square wave photoperiods as light  ... 
doi:10.1016/j.cub.2009.10.033 pmid:19948144 fatcat:laqxjmowj5dr3mry3y6n573xui
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