Interactive Indirect Illumination Using Adaptive Multiresolution Splatting

Nichols, Greg; Wyman, Chris

doi:10.1109/tvcg.2009.97

Cited by 19 publications

(21 citation statements)

References 29 publications

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“…One such solution is to approximate indirect lighting reflected from surfaces as a set of virtual point lights (VPLs) [Keller 1997;Dachsbacher and Stamminger 2006;Ritschel et al 2008;Nichols and Wyman 2010;Thiedemann et al 2011]. Several methods [Dong et al 2007;Dachsbacher et al 2007;Crassin et al 2011] approximate global illumination using coarsescale solutions computed over a scene hierarchy.…”

Section: Related Workmentioning

confidence: 99%

Global illumination with radiance regression functions

et al. 2013

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c) (a) (b) Figure 1: Real-time rendering results with radiance regression functions for scenes with glossy interreflections (a), multiple local lights (b), and complex geometry and materials (c). AbstractWe present radiance regression functions for fast rendering of global illumination in scenes with dynamic local light sources. A radiance regression function (RRF) represents a non-linear mapping from local and contextual attributes of surface points, such as position, viewing direction, and lighting condition, to their indirect illumination values. The RRF is obtained from precomputed shading samples through regression analysis, which determines a function that best fits the shading data. For a given scene, the shading samples are precomputed by an offline renderer.The key idea behind our approach is to exploit the nonlinear coherence of the indirect illumination data to make the RRF both compact and fast to evaluate. We model the RRF as a multilayer acyclic feed-forward neural network, which provides a close functional approximation of the indirect illumination and can be efficiently evaluated at run time. To effectively model scenes with spatially variant material properties, we utilize an augmented set of attributes as input to the neural network RRF to reduce the amount of inference that the network needs to perform. To handle scenes with greater geometric complexity, we partition the input space of the RRF model and represent the subspaces with separate, smaller RRFs that can be evaluated more rapidly. As a result, the RRF model scales well to increasingly complex scene geometry and material variation. Because of its compactness and ease of evaluation, the RRF model enables real-time rendering with full global illumination effects, including changing caustics and multiple-bounce high-frequency glossy interreflections.

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Section: Related Workmentioning

confidence: 99%

Global illumination with radiance regression functions

et al. 2013

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“…Nichols and Wyman [NW09, NW10] propose hierarchical shading based on the observation that indirect illumination in regions with smooth surfaces varies slowly, while geometric detail requires more shading evaluation. Their technique uses a min–max mipmap of the depth buffer to detect discontinuities.…”

Section: Interactive and Real‐time Many‐light Renderingmentioning

confidence: 99%

Scalable Realistic Rendering with Many‐Light Methods

Dachsbacher

Křivánek

Hašan

et al. 2013

Computer Graphics Forum

116

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Recent years have seen increasing attention and significant progress in many‐light rendering, a class of methods for efficient computation of global illumination. The many‐light formulation offers a unified mathematical framework for the problem reducing the full lighting transport simulation to the calculation of the direct illumination from many virtual light sources. These methods are unrivaled in their scalability: they are able to produce plausible images in a fraction of a second but also converge to the full solution over time. In this state‐of‐the‐art report, we give an easy‐to‐follow, introductory tutorial of the many‐light theory; provide a comprehensive, unified survey of the topic with a comparison of the main algorithms; discuss limitations regarding materials and light transport phenomena and present a vision to motivate and guide future research. We will cover both the fundamental concepts as well as improvements, extensions and applications of many‐light rendering.

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“…They hierarchically combine rasterized images using bilateral upsampling [2], [19]. Similar techniques include computing interactive lighting from dynamic area light sources [20], and indirect illumination in glossy scenes [21], [22]. Light gathering methods can be improved using GPU-friendly interleaved sampling [23].…”

Section: Related Workmentioning

confidence: 99%

Interactive Rendering of Acquired Materials on Dynamic Geometry Using Frequency Analysis

Bagher

Soler

Subr

et al. 2013

IEEE Trans. Visual. Comput. Graphics

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Shading acquired materials with high-frequency illumination is computationally expensive. Estimating the shading integral requires multiple samples of the incident illumination. The number of samples required may vary across the image, and the image itself may have high- and low-frequency variations, depending on a combination of several factors. Adaptively distributing computational budget across the pixels for shading is a challenging problem. In this paper, we depict complex materials such as acquired reflectances, interactively, without any precomputation based on geometry. In each frame, we first estimate the frequencies in the local light field arriving at each pixel, as well as the variance of the shading integrand. Our frequency analysis accounts for combinations of a variety of factors: the reflectance of the object projecting to the pixel, the nature of the illumination, the local geometry and the camera position relative to the geometry and lighting. We then exploit this frequency information (bandwidth and variance) to adaptively sample for reconstruction and integration. For example, fewer pixels per unit area are shaded for pixels projecting onto diffuse objects, and fewer samples are used for integrating illumination incident on specular objects.

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Interactive Indirect Illumination Using Adaptive Multiresolution Splatting

Cited by 19 publications

References 29 publications

Global illumination with radiance regression functions

Global illumination with radiance regression functions

Scalable Realistic Rendering with Many‐Light Methods

Interactive Rendering of Acquired Materials on Dynamic Geometry Using Frequency Analysis

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