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A Survey of Real-time Soft Shadows Algorithms

J. -M. Hasenfratz, M. Lapierre, N. Holzschuch, F. Sillion, Artis GRAVIRIMAG-INRIA
2003 Computer graphics forum (Print)  
Depending on the application, the emphasis is placed on a guaranteed framerate, or on the visual quality of the shadows including penumbra effects or "soft shadows".  ...  Recommendations are included based on simple characteristics of the application such as static/moving lights, single or multiple light sources, static/dynamic geometry, geometric complexity, directed or  ...  Remark: All the smooth shadows pictures in this paper were computed with distributed ray-tracing, using 1024 samples on the area light sources.  ... 
doi:10.1111/j.1467-8659.2003.00722.x fatcat:zwcmszfvtfbwnaolr7yb237ybu

A Survey of Real-time Soft Shadows Algorithms [article]

Jean-Marc Hasenfratz, Marc Lapierre, Nicolas Holzschuch, François X. Sillion
2003 Eurographics State of the Art Reports  
Depending on the application, the emphasis is placed on a guaranteed framerate, or on the visual quality of the shadows including penumbra effects or "soft shadows".  ...  Recommendations are included based on simple characteristics of the application such as static/moving lights, single or multiple light sources, static/dynamic geometry, geometric complexity, directed or  ...  Physically exact or fake shadows Shadows from an extended light source Soft shadows come from spatially extended light sources.  ... 
doi:10.2312/egst.20031087 fatcat:pfjo5bx27bcazjoexefqaq762y

Soft Shadows by Ray Tracing Multilayer Transparent Shadow Maps [article]

Feng Xie, Eric Tabellion, Andrew Pearce
2007 Symposium on Rendering  
We present a method for high quality soft shadows for area lights in cinematic lighting.  ...  We introduce multilayer transparent shadow maps, which can be used to produce high quality soft shadows for scenes with extremely complex geometry, fur, and volume objects.  ...  When the light source has an extended area, the shadow transitions gently from darkness to softness, and gives strong visual cues to the boundaries of the object.  ... 
doi:10.2312/egwr/egsr07/265-276 fatcat:3iqnu6jfizcg5c45qkhn2gpfu4

Hierarchical Penumbra Casting

Samuli Laine, Timo Aila
2005 Computer graphics forum (Print)  
Instead of casting shadow rays, we place both the points to be shaded and the samples of an area light source into separate hierarchies, and compute hierarchically the shadows caused by each occluding  ...  We present a novel algorithm for rendering physically-based soft shadows in complex scenes.  ...  Introduction This paper describes a new algorithm for computing physically-based soft shadows from area light sources.  ... 
doi:10.1111/j.1467-8659.2005.00856.x fatcat:4gpusmoqq5eatizygojgqfmoc4

Plausible Image Based Soft Shadows Using Occlusion Textures

Elmar Eisemann, Xavier Decoret
2006 Computer Graphics and Image Processing (SIBGRAPI), Proceedings of the Brazilian Symposium on  
This paper presents a novel image-based approach to render plausible soft shadows for complex dynamic scenes with rectangular light sources.  ...  The visibility of the light source at a point in space is estimated by accumulating the occlusion caused by each texture, using a novel formula based on probabilities. * ARTIS is a team of the GRAVIR/IMAG  ...  In the real world, most light sources are not punctual and create soft shadows made of umbra and penumbra regions.  ... 
doi:10.1109/sibgrapi.2006.35 dblp:conf/sibgrapi/EisemannD06 fatcat:f2jwpetdsff6zp7rmv3rbntxne

Occlusion Textures for Plausible Soft Shadows

E. Eisemann, X. Décoret
2008 Computer graphics forum (Print)  
Authors' version: This paper presents a novel approach to obtain plausible soft shadows for complex dynamic scenes and a rectangular light source.  ...  We estimate the lights occlusion at each point of the scene using pre-filtered occlusion textures, which dynamically approximate the scene geometry.  ...  In the real world, most light sources are not punctual and create soft shadows made of umbra and penumbra regions.  ... 
doi:10.1111/j.1467-8659.2007.01037.x fatcat:qm4wtm5bfnginimejhb7yacdv4

A Multi-Agent System Approach Applied to Light Raycasting

H. Andrade, F. Ramos, Y. Kotsarenko
2012 Journal of Applied Research and Technology  
The light is casted by one or many lightagents producing hard and soft shadows.  ...  Light and shadows caused by the interaction with objects are important features in computer graphics which areusually taken into account to achieve realistic images.  ...  On the right, the corresponding shadow map is shown rendered from the viewpoint of the light source. Figure 5 . 5 Visibility function of a deep shadow map.  ... 
doi:10.22201/icat.16656423.2012.10.4.388 fatcat:xq43sqihgbdjvc5lw7i6xp3qgu

DeshadowNet: A Multi-context Embedding Deep Network for Shadow Removal

Liangqiong Qu, Jiandong Tian, Shengfeng He, Yandong Tang, Rynson W. H. Lau
2017 2017 IEEE Conference on Computer Vision and Pattern Recognition (CVPR)  
DeshadowNet is designed with a multi-context architecture, where the output shadow matte is predicted by embedding information from three different perspectives.  ...  The first global network extracts shadow features from a global view. Two levels of features are derived from the global network and transferred to two parallel networks.  ...  We configure Maya with realistic light sources to project light on occluder objects, thus casting shadows on a projection plane.  ... 
doi:10.1109/cvpr.2017.248 dblp:conf/cvpr/QuTHTL17 fatcat:dpcey5jjvvfspjqe5df2noxowu

Stylized shadows

Christopher DeCoro, Forrester Cole, Adam Finkelstein, Szymon Rusinkiewicz
2007 Proceedings of the 5th international symposium on Non-photorealistic animation and rendering - NPAR '07  
In the right images, distinct umbra and penumbra regions are shown, with varying stylizations in each.  ...  Artists often deliberately render abstract shadows, such as the shadow with reduced contour detail in this painting by Vanderlyn, 1818 (middle).  ...  the shadow map of the "key" light (to simplify cast shadows), "cheating" the shadow map away from the key light (to position the shadow for better dramatic composition), or inserting invisible, often  ... 
doi:10.1145/1274871.1274884 dblp:conf/npar/DeCoroCFR07 fatcat:6eqx4eo3qzetjdbfx3i3v77pfq

Instant convolution shadows for volumetric detail mapping

Daniel Patel, Veronika Šoltészová, Jan Martin Nordbotten, Stefan Bruckner
2013 ACM Transactions on Graphics  
Our approach is based on an approximation of physically correct shadows from distant Gaussian area light sources positioned behind the view plane, using iterative convolution.  ...  In this article, we present a method for rendering dynamic scenes featuring translucent procedural volumetric detail with all-frequency soft shadows being cast from objects residing inside the view frustum  ...  A straightforward method for creating soft shadows from area light sources is to adapt a hard shadow method by computing binary occlusion maps from several positions on the area light source and averaging  ... 
doi:10.1145/2492684 fatcat:b65c2hl3gnadtk2it52r2zwsq4

Physics-based Shadow Image Decomposition for Shadow Removal [article]

Hieu Le, Dimitris Samaras
2020 arXiv   pre-print
We use two deep networks, namely SP-Net and M-Net, to predict the shadow parameters and the shadow matte respectively. This system allows us to remove the shadow effects from images.  ...  We propose a novel deep learning method for shadow removal.  ...  We thank Tomas Vicente, Kumara Kahatapitiya, and Cristina Mata for assistance with the prior ICCV 2019 and ECCV 2020 manuscripts.  ... 
arXiv:2012.13018v1 fatcat:4xlscbzxknhflcu3bmamckx4pq

A method to generate soft shadows using a layered depth image and warping

Yeon-Ho Im, Chang-Young Han, Lee-Sup Kim
2005 IEEE Transactions on Visualization and Computer Graphics  
In our approach, using the depth peeling technique, we render an LDI from a reference light sample on a planar light source.  ...  We present an image-based method for propagating area light illumination through a Layered Depth Image (LDI) to generate soft shadows from opaque and nonrefractive transparent objects.  ...  The tree model was downloaded from www.3dcafe.com. The bunny and the dragon models were downloaded from the Stanford 3D Scanning Repository.  ... 
doi:10.1109/tvcg.2005.37 pmid:15868826 fatcat:5pvdtb67fbhhthekqefjfpgzqm

Light propagation for mixed polygonal and volumetric data

C. Zhang, D. Xue, R. Crawfis
2005 International 2005 Computer Graphics  
This paper describes a shadow algorithm for mixed polygonal and volumetric data, including the generation of soft shadows for area light sources.  ...  We extend our algorithm to handle both multiple forward scattering and back scattering with light attenuation. This constitutes a complete system for shadow generation and light propagation.  ...  The generation of soft shadows for extended light sources is a difficult topic in computer graphics.  ... 
doi:10.1109/cgi.2005.1500434 dblp:conf/cgi/ZhangXC05 fatcat:5ao64abuqnf6tlc6emjc2tmcla

Convolution Shadow Maps [article]

Thomas Annen, Tom Mertens, Philippe Bekaert, Hans-Peter Seidel, Jan Kautz
2007 Symposium on Rendering  
We present Convolution Shadow Maps, a novel shadow representation that affords efficient arbitrary linear filtering of shadows.  ...  Traditional shadow mapping is inherently non-linear w.r.t. the stored depth values, due to the binary shadow test.  ...  This effectively creates a soft penumbra, but its width is constant with respect to the projected Shadow Map size.  ... 
doi:10.2312/egwr/egsr07/051-060 fatcat:y5oz7b2eqnel7a5hwuujw34zqi

Shadow Removal via Shadow Image Decomposition [article]

Hieu Le, Dimitris Samaras
2019 arXiv   pre-print
We propose a novel deep learning method for shadow removal.  ...  We use two deep networks, namely SP-Net and M-Net, to predict the shadow parameters and the shadow matte respectively. This system allows us to remove the shadow effects on the images.  ...  Computational support provided by the Institute for Advanced Computational Science and a GPU donation from NVIDIA. We thank Tomas Vicente for assistance with the manuscript.  ... 
arXiv:1908.08628v1 fatcat:ge5vmy2voje6rh5eq3zbd6iw5e
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