The halfway vector disk for BRDF modeling

Edwards, D. K.; Boulos, Solomon; Johnson, Jared M.; Shirley, Peter; Ashikhmin, Michael; Stark, Michael; Wyman, Chris

doi:10.1145/1122501.1122502

Cited by 49 publications

(51 citation statements)

References 25 publications

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“…Figure 15 is the example of rendering image synthesis with our method implemented in the method in Ref. 4. The reflectances measured are stored in the LUT.…”

Section: Results and Summarymentioning

confidence: 99%

“…4 That is, if we define that incident angle is y 1 ; reflected angle (¼ incident angle-aspecular angle) is y 2 ; the reflectance is R(y 1 , y 2 ),the following relation is established:…”

Section: Reducing the Measuring Points By The Reciprocity Of Paint Comentioning

confidence: 99%

“…Thus, it becomes easier to compare, because the direction of the distribution always turns to z-axis. 4 We show the distribution of the number of microfacets when we change the incident angle of light source as shown in Fig. 7.…”

Section: Reducing the Measuring Points By Modeling Of Reflectance Dismentioning

confidence: 99%

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Effects of luminance, wavelength and purity on the color attributes: Brief review with new data and perspectives

Pridmore¹

2007

Color Research & Application

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As the exterior paint colors of automobiles change the shade of color and brightness according to viewing angle, the appearance of a paint finish is expressed numerically by the reflection characteristic (i.e. reflectance) of paint surface. We figure out that the reflectance of most automotive paint finishes is best measured at the incident angle of 608 and the five aspecular angles of 108, 188, 288, 408, and 908 on the incident plane (Color Res Appl 2005;30:275-282). However, in the case of the so-called color shift paint, which changes its paint finish appearance as a jewel beetle, depending on the light source location, the reflection characteristic can not be expressed accurately by conventional measuring methods. As the directions not included in the incident plane need to be taken into account, we have to measure at 48,139 points, changing all the incident angles and reflected angles. (It would take about 16 days.) We, therefore, tried to reduce the number of combinations of incident and reflected angles by analyzing the experimental data. Consequently, we reduced it to 1485 points (about 4 h). When we numerically compared our result to the result of all measuring points, we found that the color difference is 2.76 and therefore our method is practically usable.

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“…Figure 15 is the example of rendering image synthesis with our method implemented in the method in Ref. 4. The reflectances measured are stored in the LUT.…”

Section: Results and Summarymentioning

confidence: 99%

“…4 That is, if we define that incident angle is y 1 ; reflected angle (¼ incident angle-aspecular angle) is y 2 ; the reflectance is R(y 1 , y 2 ),the following relation is established:…”

Section: Reducing the Measuring Points By The Reciprocity Of Paint Comentioning

confidence: 99%

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Effects of luminance, wavelength and purity on the color attributes: Brief review with new data and perspectives

Pridmore¹

2007

Color Research & Application

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“…This approach stands somewhere between table-based methods and analytical BRDF models (Cook and Torrance, 1981;He et al;War92,LaFortune et al, 1997;Edwards et al 2006). Similar to most full BRDF models, partial models have a small memory footprint and can be readily sampled with a series of modest one dimensional (1-D) lookups (Lawrence et al,2004).…”

Section: Background and Relatedworkmentioning

confidence: 99%

A Practical Framework for Sharing and Rendering Real-World Bidirectional Scattering Distribution Functions

Ward¹

2012

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The utilization of real-world materials has been hindered by a lack of standards for sharing and interpreting measured data. This paper presents an XML representation and an Open Source C library to support bidirectional scattering distribution functions (BSDFs) in data-driven lighting simulation and rendering applications.The library provides for the efficient representation, query, and Monte Carlo sampling of arbitrary BSDFs in amodel-free framework. Currently, we support two BSDF data representations: one using a fixed subdivision of thehemisphere, and one with adaptive density. The fixed type has advantages for certain matrix operations, while theadaptive type can more accurately represent highly peaked data. We discuss advanced methods for data-drivenBSDF rendering for both types, including the proxy of detailed geometry to enhance appearance and accuracy.We also present an advanced interpolation method to reduce measured data into these standard representations.We end with our plan for future extensions and sharing of BSDF data.

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“…A novel approach of Edwards et al [17] is designed to preserve all energy while scattering, however at the cost of non-symmetric scattering function. Different approach was taken by Neumann et al [18].…”

Section: Related Workmentioning

confidence: 99%

Family of Energy Conserving Glossy Reflection Models

Radziszewski

Alda

2008

Computational Science – ICCS 2008

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Abstract. We present an improved reflection model optimized for global illumination. The model produces visually plausible images, is symmetric and has improved energy preserving capabilities compared to previous approaches which satisfies these requirements. Having an efficient sampling routine, the model is ready to use in Monte Carlo rendering. Presented model is phenomenological, i.e. it has intuitive glossiness parameter that affects its appearance. Moreover it can be used as a set of basis functions designed to fit material reflection to measured data.

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The halfway vector disk for BRDF modeling

Cited by 49 publications

References 25 publications

Effects of luminance, wavelength and purity on the color attributes: Brief review with new data and perspectives

Effects of luminance, wavelength and purity on the color attributes: Brief review with new data and perspectives

A Practical Framework for Sharing and Rendering Real-World Bidirectional Scattering Distribution Functions

Family of Energy Conserving Glossy Reflection Models

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