Multiresolution splatting for indirect illumination

Nichols, Greg; Wyman, Chris

doi:10.1145/1507149.1507162

Cited by 59 publications

(42 citation statements)

References 30 publications

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“…Dachsbacher et al [4] employ reflective shadow maps to create VPLs to model single-bounce indirect lighting and gather the contributions via splatting [5]. Nichols et al extend on this by clustering VPLs [13] and hierarchical splatting [11,12]. While the proposed method also employs similar hierarchical data structures, key differences are the sampling and splatting strategies used to accommodate for differences in the density of the incident radiance between both: VPLs are sparsely distributed through the scene and their contribution covers the whole screen; conversely, in the case of heterogeneous subsurface scattering, the density of the irradiance samples is much higher, and their contribution covers a local screen region.…”

Section: Related Workmentioning

confidence: 99%

Real-time rendering of deformable heterogeneous translucent objects using multiresolution splatting

et al. 2012

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In this paper, we present a novel real-time rendering algorithm for heterogenous translucent objects with deformable geometry. The proposed method starts by rendering the surface geometry in two separate geometry buffersthe irradiance buffer and the splatting buffer-with corresponding mipmaps from the lighting and viewing directions, respectively. Irradiance samples are selected from the irradiance buffer according to geometric and material properties using a novel and fast selection algorithm. Next, we gather the irradiance per visible surface point by splatting the irradiance samples to the splatting buffer. To compute the appearance of long-distance low-frequency subsurface scattering, as well as short-range detailed scattering, a fast novel multiresolution GPU algorithm is developed that computes everything on the fly and which does not require any precomputations. We illustrate the effectiveness of our method on several deformable geometries with measured heterogeneous translucent materials.

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Section: Related Workmentioning

confidence: 99%

Real-time rendering of deformable heterogeneous translucent objects using multiresolution splatting

et al. 2012

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“…Higher detail is required in such areas as ambient occlusion may vary significantly from point to point. We take advantage of this fact and use a stencil based screen-space multi-resolution approach similar to Nichols and Wyman [NW09] and Nichols et al [NPW10], where we selectively render higher detail areas and lower detail areas with different precision. Ambient occlusion varies smoothly across a scene, allowing lower detail areas to be rendered at lower precision.…”

Section: Multiresolution Ambient Occlusionmentioning

confidence: 99%

“…We sample depth values from the G-buffer and compute depth discontinuities similar to Nichols and Wyman [NW09] and Nichols et al [NPW10]. We use the computed curvature buffer and depth buffer for stencil refinement, which is discussed in the following section.…”

Section: Curvature and Depth As Metricsmentioning

confidence: 99%

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Voxel-Space Ambient Occlusion

Penmatsa

Nichols

Wyman

2012

Self Cite

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Ambient occlusion adds important detail to a scene. This paper presents a multiresolution screen-space voxel based ambient occlusion technique, which improves G-buffer based techniques, avoiding artifacts such as haloing. Our technique is scalable to the level-of-detail desired by the user. REPORT DATE (DD-MM-YYYY)4. TITLE AND SUBTITLE 13. SUPPLEMENTARY NOTES The views, opinions and/or findings contained in this report are those of the author(s) and should not contrued as an official Department of the Army position, policy or decision, unless so designated by other documentation. DISTRIBUTION AVAILIBILITY STATEMENTApproved for public release; distribution is unlimited. Because we assume voxels to be small objects, we compute ambient occlusion using an area rendering equation based formulation. As ambient occlusion changes smoothly across a scene, we use a stencil based screen-space multiresolution buffer to refine and render multiple resolution images. Curvature and depth discontinuity metrics to identify appropriate sampling rates. Abstract Ambient occlusion adds important detail to a scene. This paper presents a multiresolution screen-space voxel based ambient occlusion technique, which improves G-buffer based techniques, avoiding artifacts such as haloing. Our technique is scalable to the level-of-detail desired by the user. UU SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)6 Voxel-Space Ambient OcclusionBecause we assume voxels to be small objects, we compute ambient occlusion using an area rendering equation based formulation. As ambient occlusion changes smoothly across a scene, we use a stencil based screen-space multiresolution buffer to refine and render multiple resolution images. Curvature and depth discontinuity metrics to identify appropriate sampling rates.

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“…Min-max mipmaps have previously been used for accelerating soft shadows [Guennebaud et al 2006], global illumination [Nichols and Wyman 2009], as well as ray tracing geometry images [Carr et al 2006] and height fields [Mastin et al 1987;Musgrave et al 1989;Tevs et al 2008]. In our case, thanks to rectification, we only need 1D min-max mipmaps, whose traversal is simple and efficient.…”

Section: Introductionmentioning

confidence: 99%

Real-time volumetric shadows using 1D min-max mipmaps

Chen¹,

Baran

Durand³

et al. 2011

Symposium on Interactive 3D Graphics and Games

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To compute single scattering in scenes with occluders (left) we compute a depth image from the camera, and a shadow map from the light. After epipolar rectification, each row of the shadow map is a 1D heightfield. We optimize the computation of the scattering integral by using an efficient data structure (a 1D min-max mipmap, center) over this heightfield. This data structure helps compute the scattering integral for all camera rays in parallel. Our method can render complex high-quality scenes with textured lights (right) in real-time (55 FPS). AbstractLight scattering in a participating medium is responsible for several important effects we see in the natural world. In the presence of occluders, computing single scattering requires integrating the illumination scattered towards the eye along the camera ray, modulated by the visibility towards the light at each point. Unfortunately, incorporating volumetric shadows into this integral, while maintaining real-time performance, remains challenging.In this paper we present a new real-time algorithm for computing volumetric shadows in single-scattering media on the GPU. This computation requires evaluating the scattering integral over the intersections of camera rays with the shadow map, expressed as a 2D height field. We observe that by applying epipolar rectification to the shadow map, each camera ray only travels through a single row of the shadow map (an epipolar slice), which allows us to find the visible segments by considering only 1D height fields. At the core of our algorithm is the use of an acceleration structure (a 1D minmax mipmap) which allows us to quickly find the lit segments for all pixels in an epipolar slice in parallel. The simplicity of this data structure and its traversal allows for efficient implementation using only pixel shaders on the GPU.

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Multiresolution splatting for indirect illumination

Cited by 59 publications

References 30 publications

Real-time rendering of deformable heterogeneous translucent objects using multiresolution splatting

Real-time rendering of deformable heterogeneous translucent objects using multiresolution splatting

Voxel-Space Ambient Occlusion

Real-time volumetric shadows using 1D min-max mipmaps

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