Tiled light trees

O'Donnell, Yuriy; Chajdas, Matthäus G.

doi:10.1145/3023368.3023376

“…Tiled shading [2,28] works by binning such lights into screen-space tiles, where the depth bounds of the tiles effectively reduce the number of lights that need to be processed when shading each tile. Modern variants improve culling rates by splitting frusta in depth (2.5D culling) [15], by clustering shading points or lights [29,30], or by using per-tile light trees [27].…”

Section: Real-time Light Cullingmentioning

confidence: 99%

Importance Sampling of Many Lights on the GPU

Moreau

¹

,

Clarberg

²

2019

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The introduction of standardized APIs for ray tracing, together with hardware acceleration, opens up possibilities for physically based lighting in real-time rendering. Light importance sampling is one of the fundamental operations in light transport simulations, applicable to both direct and indirect illumination. This chapter describes a bounding volume hierarchy data structure and associated sampling methods to accelerate importance sampling of local light sources. The work is based on recently published methods for light sampling in production rendering, but it is evaluated in a real-time implementation using Microsoft DirectX Raytracing.

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“…Additionally, it is possible to reuse existing algorithms for use in light culling or spatial sampling. In recent years, lighting techniques for rasterisation have favoured tiled or clustered shading [78,79,79,80]. Usually implemented in view-space, tiled shading divides the output image into a series of small tiles and generates a list of lights for each to sample from; clustered shading extends this with a series of depth slices, forming a 3D grid-like structure.…”

Section: Biased Light Samplingmentioning

confidence: 99%

Interactive Generation of Path-Traced Lightmaps

Roughton¹

0

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<p>Indirect illumination is an important part of realistic images, and accurately simulating the complex effects of indirect illumination in real-time applications has long been a challenge for the industry. One popular approach is to use offline precomputed solutions such as lightmaps (textures containing the precomputed lighting in a scene) to efficiently approximate these effects. Unfortunately, these offline solutions have historically enforced long iteration times that come at a cost to artist productivity. These solutions have additionally either supported only the low-frequency diffuse component of indirect lighting, yielding poor visual results for glossy or metallic materials, or have used overly expensive approximations. In recent years, the state of the art lightmap precomputation pipeline has shifted to using highly vectorised path tracing, often on GPU hardware, to compute the indirect illumination effects. The use of path tracing enables progressive rendering, wherein an approximation to the full solution is found and then refined as opposed to solving for the final result in a single step. Progressive rendering through path tracing thereby helps to provide rapid iteration for artists. This thesis describes a system that can progressively path-trace indirect illumination lightmaps on the GPU.Contributing to this system, itintroduces a new gather-based method for sample accumulation, enhances algorithms from prior work, and presents a range of encoding methods, including a novel progressive method for non-negative least-squares encoding of spherical basis functions. In addition, it presents a novel, efficient solution for high-quality precomputed diffuse and low-frequency specular indirect illumination that extends the Ambient Dice family of spherical basis functions. This solution provides comparable or better specular reconstruction to prior work at lower runtime cost and has potential for widespread use in real-time applications.</p>

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“…Additionally, it is possible to reuse existing algorithms for use in light culling or spatial sampling. In recent years, lighting techniques for rasterisation have favoured tiled or clustered shading [78,79,79,80]. Usually implemented in view-space, tiled shading divides the output image into a series of small tiles and generates a list of lights for each to sample from; clustered shading extends this with a series of depth slices, forming a 3D grid-like structure.…”

Section: Biased Light Samplingmentioning

confidence: 99%

Interactive Generation of Path-Traced Lightmaps

Roughton¹

1

0

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<p>Indirect illumination is an important part of realistic images, and accurately simulating the complex effects of indirect illumination in real-time applications has long been a challenge for the industry. One popular approach is to use offline precomputed solutions such as lightmaps (textures containing the precomputed lighting in a scene) to efficiently approximate these effects. Unfortunately, these offline solutions have historically enforced long iteration times that come at a cost to artist productivity. These solutions have additionally either supported only the low-frequency diffuse component of indirect lighting, yielding poor visual results for glossy or metallic materials, or have used overly expensive approximations. In recent years, the state of the art lightmap precomputation pipeline has shifted to using highly vectorised path tracing, often on GPU hardware, to compute the indirect illumination effects. The use of path tracing enables progressive rendering, wherein an approximation to the full solution is found and then refined as opposed to solving for the final result in a single step. Progressive rendering through path tracing thereby helps to provide rapid iteration for artists. This thesis describes a system that can progressively path-trace indirect illumination lightmaps on the GPU.Contributing to this system, itintroduces a new gather-based method for sample accumulation, enhances algorithms from prior work, and presents a range of encoding methods, including a novel progressive method for non-negative least-squares encoding of spherical basis functions. In addition, it presents a novel, efficient solution for high-quality precomputed diffuse and low-frequency specular indirect illumination that extends the Ambient Dice family of spherical basis functions. This solution provides comparable or better specular reconstruction to prior work at lower runtime cost and has potential for widespread use in real-time applications.</p>

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Tiled light trees

Cited by 7 publications

References 6 publications

Importance Sampling of Many Lights on the GPU

Importance Sampling of Many Lights on the GPU

Interactive Generation of Path-Traced Lightmaps

Interactive Generation of Path-Traced Lightmaps

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