The lightspeed automatic interactive lighting preview system

Ragan-Kelley, Jonathan; Kilpatrick, Charlie; Smith, Brian W.; Epps, Doug; Green, Paul; Hery, Christophe; Durand, Frédo

doi:10.1145/1239451.1239476

Cited by 10 publications

(16 citation statements)

References 9 publications

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“…Decoupled sampling has the advantage over micropolygon shading that it only computes shading after precise visibility, reducing overshade in complex scenes with opaque surfaces. (Though micropolygon renderers perform conservative culling before shading, studies of real scenes have shown significant over-shading of non-visible points in RenderMan [Ragan-Kelley et al 2007]. ) Decoupled sampling also allows decoupled shading and visibility sampling with larger-thansub-pixel polygons, saving geometry processing overhead where possible.…”

Section: Discussionmentioning

confidence: 99%

“…Lightspeed's indirect framebuffer eliminates overshading and enables interactive rendering of motion blur, defocus blur, and transparency for relighting by preprocessing Reyes' full visibility structure for a fixed scene and viewpoint [Ragan-Kelley et al 2007]. Shadermaps [Jones et al 2000] precompute time-and viewindependent parts of a shader to save computation over an entire animation.…”

Section: Decoupled Shading and Reusementioning

confidence: 99%

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Decoupled sampling for graphics pipelines

et al. 2011

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and FRÉDO DURAND MIT CSAILWe propose a generalized approach to decoupling shading from visibility sampling in graphics pipelines, which we call decoupled sampling. Decoupled sampling enables stochastic supersampling of motion and defocus blur at reduced shading cost, as well as controllable or adaptive shading rates which trade off shading quality for performance. It can be thought of as a generalization of multisample antialiasing (MSAA) to support complex and dynamic mappings from visibility to shading samples, as introduced by motion and defocus blur and adaptive shading. It works by defining a many-to-one hash from visibility to shading samples, and using a buffer to memoize shading samples and exploit reuse across visibility samples. Decoupled sampling is inspired by the Reyes rendering architecture, but like traditional graphics pipelines, it shades fragments rather than micropolygon vertices, decoupling shading from the geometry sampling rate. Also unlike Reyes, decoupled sampling only shades fragments after precise computation of visibility, reducing over-shading.We present extensions of two modern graphics pipelines to support decoupled sampling: a GPU-style sort-last fragment architecture, and a Larrabee-style sort-middle pipeline. We study the architectural implications of decoupled sampling and blur, and derive end-to-end performance estimates on real applications through an instrumented functional simulator. We demonstrate high-quality motion and defocus blur, as well as variable and adaptive shading rates.

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Section: Discussionmentioning

confidence: 99%

Section: Decoupled Shading and Reusementioning

confidence: 99%

Decoupled sampling for graphics pipelines

et al. 2011

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“…Lightspeed decouples visibility samples from geometry samples (G-buffer) with an indirect frame-buffer which densely encodes variable-rate visibility information, enabling faster shading [Ragan-Kelley et al 2007]. Initially developed for incremental relighting applications this method can be implemented in real-time on modern GPUs but it cannot alleviate MSAA memory requirements.…”

Section: Related Workmentioning

confidence: 99%

Surface based anti-aliasing

Salvi¹,

Vidimče²

2012

Proceedings of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games

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Figure 1: From left to right: 8x super-sample anti-aliasing (SSAA), 8x multi-sample anti-aliasing (MSAA) and surface-based anti-aliasing (SBAA) with 8 visibility and 2 surface samples per pixel. The circles represent visibility samples, while the blue and red discs represent shading samples from two different surfaces. The four red primitives sharing the same vertex are part of the same foreground surface. Our MERGE2 algorithm exploits this configuration and shades only one sample for all four red primitives while reserving a second surface sample for the blue background surface. Unlike multi-sampling, SBAA based algorithms impose an upper bound on the number of captured, stored and shaded surfaces rather than primitives in each pixel, therefore significantly reducing storage and shading costs. AbstractWe present surface based anti-aliasing (SBAA), a new approach to real-time anti-aliasing for deferred renderers that improves the performance and lowers the memory requirements for anti-aliasing methods that sample sub-pixel visibility. We introduce a novel way of decoupling visibility determination from shading that, compared to previous multi-sampling based approaches, significantly reduces the number of samples stored and shaded per pixel. Unlike postprocess anti-aliasing techniques used in conjunction with deferred renderers, SBAA correctly resolves visibility of sub-pixel features, minimizing spatial and temporal artifacts.

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“…The LightSpeed architecture for cinematic relighting [Ragan-Kelley et al 2007] uses an indirect framebuffer for decoupling shading samples from pixels together with a deepframebuffer to handle antialiasing, motion blur and transparency efficiently; cache compression is reduced to deep-framebuffers. In the same spirit, Hoberock et al [2009] propose compaction of Gbuffers for heterogeneous shader execution.…”

Section: Introductionmentioning

confidence: 99%

Decoupled deferred shading for hardware rasterization

Liktor

Dachsbacher

2012

Proceedings of the ACM SIGGRAPH Symposium on Interactive 3D Graphics and Games

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Figure 1: Decoupled deferred shading enables efficient shading reuse for stochastic rasterization. These images show depth of field rendering with 4× visibility supersampling (left), a visualization of the shading rate (sspp-shading samples per pixel, center), and the same shading as seen from a pin-hole camera (right). Our adaptive scheme reduces the shading frequency of defocused regions. AbstractIn this paper we present decoupled deferred shading: a rendering technique based on a new data structure called compact geometry buffer, which stores shading samples independently from the visibility. This enables caching and efficient reuse of shading computation, e.g. for stochastic rasterization techniques. In contrast to previous methods, our decoupled shading can be efficiently implemented on current graphics hardware. We describe two variants which differ in the way the shading samples are cached: the first maintains a single cache for the entire image in global memory, while the second pursues a tile-based approach leveraging local memory of the GPU's multiprocessors. We demonstrate the application of decoupled deferred shading to speed up the rendering in applications with stochastic supersampling, depth of field, and motion blur.

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The lightspeed automatic interactive lighting preview system

Cited by 10 publications

References 9 publications

Decoupled sampling for graphics pipelines

Decoupled sampling for graphics pipelines

Surface based anti-aliasing

Decoupled deferred shading for hardware rasterization

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