Physically based shading in theory and practice

Hill, Stephen; McAuley, Stephen; Conty, Alejandro; Drobot, Michał; Heitz, Eric; Hery, Christophe; Kulla, Christopher; Lanz, Jon; Ling, Junyi; Walster, Nathan; Xie, Feng; Micciulla, Adam; Villemin, Ryusuke

doi:10.1145/3084873.3084893

Cited by 13 publications

(6 citation statements)

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“…Using a composite model is obviously more costly compared to a single‐component specular BRDF. However, this is already used in production [HMC*], which shows that the improved control over the shape of reflections is worth the increased computation time.…”

Section: Discussion and Future Workmentioning

confidence: 99%

“…The use of multiple components was first suggested in the seminal work of Cook and Torrance [CT82] on microfacet theory. It is nowadays routinely used in production [HMC*], where such a combination of functions is primarily aimed at better shaping the specular component. However, as shown in the left column of Figure , even though the model of Equation yields a more complex specular BRDF, it does not provide an independent control over distribution tails.…”

Section: Hazy Gloss Modelmentioning

confidence: 99%

“…Another simpler approach is to combine two or more distributions, which has oftentimes been deemed necessary for fitting BRDFs (e.g., [LFTG, NDM05]). Combination may also be performed manually for gaining more control over the shape of the specular term, as done by artists at Pixar or ImageWorks for instance [HMC*]. However, the manipulation of haze is only indirect in this case and requires trial and error.…”

Section: Introduction and Related Workmentioning

confidence: 99%

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A Composite BRDF Model for Hazy Gloss

Barla

Pacanowski²,

Vangorp

2018

Computer Graphics Forum

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We introduce a bidirectional reflectance distribution function (BRDF) model for the rendering of materials that exhibit hazy reflections, whereby the specular reflections appear to be flanked by a surrounding halo. The focus of this work is on artistic control and ease of implementation for real-time and off-line rendering. We propose relying on a composite material based on a pair of arbitrary BRDF models; however, instead of controlling their physical parameters, we expose perceptual parameters inspired by visual experiments [VBF17]. Our main contribution then consists in a mapping from perceptual to physical parameters that ensures the resulting composite BRDF is valid in terms of reciprocity, positivity and energy conservation. The immediate benefit of our approach is to provide direct artistic control over both the intensity and extent of the haze effect, which is not only necessary for editing purposes, but also essential to vary haziness spatially over an object surface. Our solution is also simple to implement as it requires no new importance sampling strategy and relies on existing BRDF models. Such a simplicity is key to approximating the method for the editing of hazy gloss in real-time and for compositing.

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Section: Discussion and Future Workmentioning

confidence: 99%

Section: Hazy Gloss Modelmentioning

confidence: 99%

Section: Introduction and Related Workmentioning

confidence: 99%

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A Composite BRDF Model for Hazy Gloss

Barla

Pacanowski²,

Vangorp

2018

Computer Graphics Forum

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“…Despite the similarity of the calculation, the proposed method has a conceptual advantage over VCT in the sense that it accurately calculates the area integration over the cutting section and also considers the light extinction within the interval between two adjacent cutting sections. Thus, the proposed method can be combined with VCT because a cutting section of the cone perpendicular to the conic axis is always a circle, and the area integration over a circle can be efficiently calculated as well as a polygon, as introduced in [HH17]. For future α = 0.1 α = 0.001…”

Section: Comparison With Alternative Methodsmentioning

confidence: 99%

“…Figure 6 illustrates these problems. First, the LTC-based integration is only applicable to area lights with polygonal shapes, while follow-up studies extended the target shape to circles and ellipses [HH17]. Therefore, we need to perform an intersection test between an AABB and a cutting plane to determine the number of angles of a cutting section.…”

Section: Volume Domain Transformationmentioning

confidence: 99%

Real‐time Indirect Illumination of Emissive Inhomogeneous Volumes using Layered Polygonal Area Lights

Kuge

Yatagawa

Morishima

2019

Computer Graphics Forum

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Indirect illumination involving with visually rich participating media such as turbulent smoke and loud explosions contributes significantly to the appearances of other objects in a rendering scene. However, previous real‐time techniques have focused only on the appearances of the media directly visible from the viewer. Specifically, appearances that can be indirectly seen over reflective surfaces have not attracted much attention. In this paper, we present a real‐time rendering technique for such indirect views that involves the participating media. To achieve real‐time performance for computing indirect views, we leverage layered polygonal area lights (LPALs) that can be obtained by slicing the media into multiple flat layers. Using this representation, radiance entering each surface point from each slice of the volume is analytically evaluated to achieve instant calculation. The analytic solution can be derived for standard bidirectional reflectance distribution functions (BRDFs) based on the microfacet theory. Accordingly, our method is sufficiently robust to work on surfaces with arbitrary shapes and roughness values. In addition, we propose a quadrature method for more accurate rendering of scenes with dense volumes, and a transformation of the domain of volumes to simplify the calculation and implementation of the proposed method. By taking advantage of these computation techniques, the proposed method achieves real‐time rendering of indirect illumination for emissive volumes.

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Learning Dynamic Tetrahedra for High-Quality Talking Head Synthesis

Zhang,

Zheng,

et al. 2024

2024 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)

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Physically based shading in theory and practice

Cited by 13 publications

References 0 publications

A Composite BRDF Model for Hazy Gloss

A Composite BRDF Model for Hazy Gloss

Real‐time Indirect Illumination of Emissive Inhomogeneous Volumes using Layered Polygonal Area Lights

Learning Dynamic Tetrahedra for High-Quality Talking Head Synthesis

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