CC shadow volumes

Lloyd, Brandon; Wendt, Jeremy; Govindaraju, Naga K.; Manocha, Dinesh

doi:10.1145/1186223.1186406

Cited by 24 publications

(20 citation statements)

References 15 publications

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“…Litmaps introduced in [12], or CC Shadow volumes [22] could serve that purpose. It is possible to create per object representations, following [34].…”

Section: Discussionmentioning

confidence: 99%

Plausible Image Based Soft Shadows Using Occlusion Textures

Eisemann¹,

Décoret²

2006

2006 19th Brazilian Symposium on Computer Graphics and Image Processing

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This paper presents a novel image-based approach to render plausible soft shadows for complex dynamic scenes with rectangular light sources. The algorithm's performance is mostly independent of the scene complexity and the source's size. Occluders and receivers do not need to be separated and no knowledge about the scene representation is required, making the method easy to use. The main idea is to approximate the occlusion in the scene with preltered occlusion textures. 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.

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“…Litmaps introduced in [12], or CC Shadow volumes [22] could serve that purpose. It is possible to create per object representations, following [34].…”

Section: Discussionmentioning

confidence: 99%

Plausible Image Based Soft Shadows Using Occlusion Textures

Eisemann¹,

Décoret²

2006

2006 19th Brazilian Symposium on Computer Graphics and Image Processing

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“…In our algorithm, on the other hand, the creation of the depth map itself is accelerated, which is a significant benefit for many large scenes. Lloyd et al [2004] later extended shadow caster culling by shadow volume clamping, which significantly reduced the fillrate when rendering shadow volumes. Their paper additionally describes a method for narrowing the stencil mask to shadow receiver fragments that are detected to lie in shadow.…”

Section: Related Workmentioning

confidence: 99%

“…Décoret [2005] proposed a different method for shadow volume clamping as one of the applications for N-buffers. Unlike Lloyd et al [2004] Décoret enhances the stencil mask by detecting receiver fragments which are visible from the camera. The methods for shadow volume culling and clamping have been extended by techniques allowing for more efficient GPU implementations [Eisemann and Décoret 2006;Engelhardt and Dachsbacher 2009].…”

Section: Related Workmentioning

confidence: 99%

Shadow caster culling for efficient shadow mapping

Bittner

Mattausch

Silvennoinen

et al. 2011

Symposium on Interactive 3D Graphics and Games

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Figure 1: (left) A view of a game scene rendered with shadows. (right) Shadow map with shadow casters rendered using a naive application of occlusion culling in the light view (gray), and shadow casters rendered using our new method (orange). The view frustum corresponding to the left image is shown in yellow. Note that for this view our shadow caster culling provided a 3x reduction in the number of rendered shadow casters, leading to a 1.5x increase in total frame rate. The scene is a part of the Left 4 Dead 2 game (courtesy of Valve Corp.). AbstractWe propose a novel method for efficient construction of shadow maps by culling shadow casters which do not contribute to visible shadows. The method uses a mask of potential shadow receivers to cull shadow casters using a hierarchical occlusion culling algorithm. We propose several variants of the receiver mask implementations with different culling efficiency and computational costs. For scenes with statically focused shadow maps we designed an efficient strategy to incrementally update the shadow map, which comes close to the rendering performance for unshadowed scenes. We show that our method achieves 3x-10x speedup for rendering large city like scenes and 1.5x-2x speedup for rendering an actual game scene.

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“…We reduce ray marching costs using analytic fog contributions [19] along illuminated ray segments, limiting the number of steps by only marching between front and back shadow polygons. Conceptually, this is similar to surface shadowing techniques that restrict work to necessary regions by culling [13] and stenciling [1,4]. We also propose computing scattering at low resolution, allowing us to extend our work to scenes with textured spotlights for a modest cost increase.…”

Section: Introductionmentioning

confidence: 96%

Interactive volumetric shadows in participating media with single-scattering

Wyman

Ramsey

2008

2008 IEEE Symposium on Interactive Ray Tracing

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Figure 1: Interactive volumetric shadows rendered at 40 to 80 fps with our hybrid shadow volume and ray marching technique. ABSTRACTScattering effects arising from participating media, such as smoke, haze, and fog, dramatically add to perceived realism in renderings. As shadows affect illumination throughout an environment, they significantly diminish scattering effects in umbral regions. Unlike surface shadowing, accurate volumetric shadows require simultaneously integrating illumination, scattering, and attenuation throughout the volume, which proves challenging for interactive applications. We propose a method for rendering volumetric shadows in homogeneous single scattering media that combines ray marching and shadow volume techniques, eliminating performance deficiencies inherent in both. We extend this approach to interactively render shadows from textured lights and show results under two scattering models. Our prototype uses graphics hardware to accelerate shadow volume and ray marching computations. However since our hybrid selects sample points more intelligently than brute force techniques, it could also be applied to traditional ray tracing.

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CC shadow volumes

Cited by 24 publications

References 15 publications

Plausible Image Based Soft Shadows Using Occlusion Textures

Plausible Image Based Soft Shadows Using Occlusion Textures

Shadow caster culling for efficient shadow mapping

Interactive volumetric shadows in participating media with single-scattering

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