Interactive volumetric shadows in participating media with single-scattering

Wyman, Chris; Ramsey, Shaun

doi:10.1109/rt.2008.4634627

Cited by 33 publications

(33 citation statements)

References 14 publications

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“…This results as images where visible beams of light emanate from the light source. If there are objects blocking the light beams, then no light scattering will occur in the umbral regions behind the objects, and so called volumetric shadows (Figure 1) will appear (Wyman and Ramsey, 2008).…”

Section: Volumetric Shadowsmentioning

confidence: 99%

Enhancing Spatial Perception and User Experience in Video Games with Volumetric Shadows

Takala¹,

Hämäläinen²,

Matveinen³

et al. 2015

Computer-Human Interaction. Cognitive Effects of Spatial Interaction, Learning, and Ability

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In this paper, we investigate the use of volumetric shadows for enhancing three-dimensional perception and action in third-person motion games. They offer an alternative to previously studied cues and visual guides. Our preliminary survey revealed that from the games that require Kinect, 37% rely primarily on a third-person view and 9% on a first-person view. We conducted a user study where 30 participants performed object reaching, interception, and aiming tasks in six different graphical modes of a video game that was controlled using a Kinect sensor and PlayStation Move controllers. The study results indicate that different volumetric shadow cues can affect both the user experience and the gameplay performance positively or negatively, depending on the lighting setup. Qualitative user experience analysis shows that playing was found to be most easy and fluent in a typical virtual reality setting with stereo rendering and flat surface shadows.

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Section: Volumetric Shadowsmentioning

confidence: 99%

Enhancing Spatial Perception and User Experience in Video Games with Volumetric Shadows

Takala¹,

Hämäläinen²,

Matveinen³

et al. 2015

Computer-Human Interaction. Cognitive Effects of Spatial Interaction, Learning, and Ability

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“…While effective and providing high interactivity, the underlying equations are built upon the assumption of homogeneous media, and overlook the volumetric shadows effects due to light occlusion by solid objects. Such occlusions are accounted for in [Wyman and Ramsey 2008], which relies on shadow volumes and ray marching. This method provides high frame rates, but the shadow volume extraction may become problematic in complex scenes.…”

Section: Related Workmentioning

confidence: 99%

Transmittance function mapping

Delalandre

Gautron

Marvie

et al. 2011

Symposium on Interactive 3D Graphics and Games

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The Moving Picture Company (a) Cloud -100 steps -8 fps (b) TinPan Alley -500 steps -10 fps (c) GI-Joe * -50 steps -3000 lights -7minFigure 1: Our algorithm introduces transmittance function maps for the computation of light scattering within participating media for both real-time using a GeForce GTX480 (a, b) and production rendering (c) using Pixar's RenderMan R . AbstractThe interaction between light and participating media involves complex physical phenomena including light absorption and scattering. Media such as fog, clouds or smoke feature complex lighting interactions that are intrinsically related to the properties of their constitutive particles. As a result, the radiance transmitted by the medium depends on the varying properties on the entire light paths, which generate soft light shafts and opacity variations.Simulating light scattering in these media usually requires complex offline estimations. Real-time applications are either based on heavy precomputations, limited to homogeneous media or relying on simplistic rendering techniques such as billboards. We propose a generic method for fast estimation of single scattering within participating media. Introducing the concept of Transmittance Function Maps and Uniform Projective Space Sampling, our method leverages graphics hardware for interactive support of dynamic light sources, viewpoints and participating media. Our method also accounts for the shadows cast from solid objects, providing a fullfeatured solution for fast rendering of participating media which potentially embrace the entire scene.

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“…Consequently, the computation cost scales with the number of rays and samples along the ray. The previous work [2] uses down sampling to reduce the number of rays, and restricts ray marching regions to lit segments. Another approach [3] uses irregular sampling and interpolates to reduce the number of rays.…”

Section: Introductionmentioning

confidence: 99%

Adaptive sampling approach for volumetric shadows in dynamic scenes

Lin

Chang²,

Tsai³

et al. 2013

IET Image Processing

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Ray marching is an important technique to generate volumetric lighting effects. However, it is very expensive for each pixel on the screen, especially in dynamic scenes. The authors propose an adaptive approach to reduce samples for volumetric shadows in the time domain. In dynamic scenes, shadow volumes of moving objects are created and are rasterised to decide pixels that cannot be reused. The authors use a stencil buffer to maintain the information of screen pixels by recomputing or just using the previous information. Experimental results show that the proposed approach is simple to implement. Moreover, compared to the previous method, the proposed approach achieves a specific speedup and maintains similar visual quality.

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Interactive volumetric shadows in participating media with single-scattering

Cited by 33 publications

References 14 publications

Enhancing Spatial Perception and User Experience in Video Games with Volumetric Shadows

Enhancing Spatial Perception and User Experience in Video Games with Volumetric Shadows

Transmittance function mapping

Adaptive sampling approach for volumetric shadows in dynamic scenes

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