Local, deformable precomputed radiance transfer

Sloan, Peter-Pike; Luna, Ben; Snyder, John

doi:10.1145/1186822.1073335

Cited by 55 publications

(60 citation statements)

References 34 publications

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“…It was first used to accelerate MC algorithms [24], [27] and then several papers extended these algorithms to improve their quality [7], [10], [11], [32]. Recently, the dipole diffusion BSSRDF has been used to create real-time algorithms [5], [6], [8], [21], [22], [31], [33], [34]; included in precomputed radiance transfer systems [41], [48]; and scaled to large scenes using a Light cuts based algorithm [2], [46].…”

Section: Dipole Diffusion Algorithmsmentioning

confidence: 99%

Heterogeneous Subsurface Scattering Using the Finite Element Method

Arbree

Walter

Bala

2011

IEEE Trans. Visual. Comput. Graphics

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Abstract-Materials with visually important heterogeneous subsurface scattering, including marble, skin, leaves, and minerals, are common in the real world. However, general, accurate and efficient rendering of these materials is an open problem. In this paper, we describe a finite element (FE) solution of the heterogeneous diffusion equation (DE) that solves this problem. Our algorithm is the first to use the FE method to solve the difficult problem of heterogeneous subsurface rendering. To create our algorithm, we make two contributions. First, we correct previous work and derive an accurate and complete heterogeneous diffusion formulation. This formulation has two key elements: an accurate model of the reduced intensity (RI) source, the diffusive source boundary condition (DSBC), and its associated render query function. Second, we solve this formulation accurately and efficiently using the FE method. Using there results, we can render subsurface scattering with a simple four step algorithm. To demonstrate that our algorithm is simultaneously general, accurate and efficient, we test its performance on a series of difficult scenes. For a wide range of materials and geometry, it produces, in minutes, images that nearly match path traced references, that required hours.

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Section: Dipole Diffusion Algorithmsmentioning

confidence: 99%

Heterogeneous Subsurface Scattering Using the Finite Element Method

Arbree

Walter

Bala

2011

IEEE Trans. Visual. Comput. Graphics

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“…Recently, Sloan et al proposed to fit the precomputed transfer function of local features by zonal harmonics, which can then be rotated efficiently at runtime for multiplication with the global incident lighting [23], represented in spherical harmonics.…”

Section: Related Workmentioning

confidence: 99%

Radiance Transfer Biclustering for Real-Time All-Frequency Biscale Rendering

Sun

Hou

Ren

et al. 2011

IEEE Trans. Visual. Comput. Graphics

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Abstract-We present a real-time algorithm to render all-frequency radiance transfer at both macroscale and mesoscale. At a mesoscale, the shading is computed on a per-pixel basis by integrating the product of the local incident radiance and a bidirectional texture function. While at a macroscale, the precomputed transfer matrix, which transfers the global incident radiance to the local incident radiance at each vertex, is losslessly compressed by a novel biclustering technique. The biclustering is directly applied on the radiance transfer represented in a pixel basis, on which the BTF is naturally defined. It exploits the coherence in the transfer matrix and a property of matrix element values to reduce both storage and runtime computation cost. Our new algorithm renders at real-time frame rates realistic materials and shadows under all-frequency direct environment lighting. Comparisons show that our algorithm is able to generate images that compare favorably with reference ray tracing results, and has obvious advantages over alternative methods in storage and preprocessing time.

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“…The coefficients are computed in a local space, having the reflection vector r as the vector around which we have circular symmetry, and need to be rotated to global space before (5) can be computed. Rotation of zonal harmonics is easier than rotating a full set of spherical harmonic basis functions, and is described by Sloan et al [2005]. The result of the rotation will be a full set of spherical harmonic coefficients, representing the Phong lobe in global space, ready to use for computation of (5).…”

Section: Rendering Using a 3d Spherical Harmonic Gridmentioning

confidence: 99%

HDR light probe sequence resampling for realtime incident light field rendering

Löw

Ynnerman

Larsson

et al. 2009

Proceedings of the 25th Spring Conference on Computer Graphics

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Figure 1: A sequence of high dynamic range light probes is resampled to a three dimensional grid of radiance maps, which are projected onto spherical harmonics to allow for realtime rendering of incident light fields. The images show realtime rendered geometry with diffuse and glossy materials, lit using spherical harmonic grid representations of the incident light fields. AbstractThis paper presents a method for resampling a sequence of high dynamic range light probe images into a representation of Incident Light Field (ILF) illumination which enables realtime rendering. The light probe sequences are captured at varying positions in a real world environment using a high dynamic range video camera pointed at a mirror sphere. The sequences are then resampled to a set of radiance maps in a regular three dimensional grid before projection onto spherical harmonics. The capture locations and amount of samples in the original data make it inconvenient for direct use in rendering and resampling is necessary to produce an efficient data structure. Each light probe represents a large set of incident radiance samples from different directions around the capture location. Under the assumption that the spatial volume in which the capture was performed has no internal occlusion, the radiance samples are projected through the volume along their corresponding direction in order to build a new set of radiance maps at selected locations, in this case a three dimensional grid. The resampled data is projected onto a spherical harmonic basis to allow for realtime lighting of synthetic objects inside the incident light field.

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Local, deformable precomputed radiance transfer

Cited by 55 publications

References 34 publications

Heterogeneous Subsurface Scattering Using the Finite Element Method

Heterogeneous Subsurface Scattering Using the Finite Element Method

Radiance Transfer Biclustering for Real-Time All-Frequency Biscale Rendering

HDR light probe sequence resampling for realtime incident light field rendering

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