Runtime implementation of modular radiance transfer

Loos, Brad; Antani, Lakulish; Mitchell, Kim; Nowrouzezahrai, Derek; Jarosz, Wojciech; Sloan, Peter-Pike

doi:10.1145/2037826.2037905

Cited by 2 publications

(2 citation statements)

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“…Moreover, clamping is required over the shape's internal creases. We rectify these continuity issues by creating a padded light map atlas, and a set of records that copy edge/corner values from neighboring un-padded regions to the padded light maps (faces translate to the center of padded faces) [Loos et al 2011]. …”

Section: Authoring the Scene Proxymentioning

confidence: 99%

“…The relevant block of T b→r is initialized to x's R b→rlf and, as each interface is traversed, is pre-multiplied with one of {R , R ↑ , R }, depending on the propagation direction [Loos et al 2011]. This traversal concatenates transport operators to "drive" indirect light from source shapes, through interfaces, to the rest of the scene.…”

Section: Interface Propagation For Distant Light Transportmentioning

confidence: 99%

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Modular Radiance Transfer

et al. 2011

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Figure 1: Indirect light computed in reduced subspaces for a cave with 19 blocks and 4 lights. We derive low-dimensional transport operators, on simple proxy shapes, that are warped and combined at run-time, at > 475 FPS on high-end GPUs and > 45 FPS on mobile platforms, and can model indirect light at surfaces (with detailed normal variation) and within volumes of large-scale scene geometry. AbstractMany rendering algorithms willingly sacrifice accuracy, favoring plausible shading with high-performance. Modular Radiance Transfer (MRT) models coarse-scale, distant indirect lighting effects in scene geometry that scales from high-end GPUs to low-end mobile platforms. MRT eliminates scene-dependent precomputation by storing compact transport on simple shapes, akin to bounce cards used in film production. These shapes' modular transport can be instanced, warped and connected on-the-fly to yield approximate light transport in large scenes. We introduce a prior on incident lighting distributions and perform all computations in low-dimensional subspaces. An implicit lighting environment induced from the low-rank approximations is in turn used to model secondary effects, such as volumetric transport variation, higher-order irradiance, and transport through lightfields. MRT is a new approach to precomputed lighting that uses a novel low-dimensional subspace simulation of light transport to uniquely balance the need for high-performance and portable solutions, low memory usage, and fast authoring iteration.

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Section: Authoring the Scene Proxymentioning

confidence: 99%

Section: Interface Propagation For Distant Light Transportmentioning

confidence: 99%