Simulation of the BSDF measurements for scattering materials with GP-200 goniophotometer for light guiding plates

Sokolov, V. G.; Potemin, Igor S.; Zhdanov, Dmitry; Barladian, Boris

doi:10.1117/12.2592378

Cited by 4 publications

(7 citation statements)

References 3 publications

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“…A special scene to simulate this characteristic as precisely as possible has been prepared. It is maximally close to the measurement scheme of GP-200 goniophotometer [37]. The simulation was done for five incident directions of parallel light in one plane corresponding to the plane of light incidence.…”

Section: Resultsmentioning

confidence: 99%

“…The GP-200 goniophotometer [36,37] was selected for measurements because it has very advanced characteristics, such as angular resolution = 0.6°, very small angular step = 0.1° and wide range of observation directions = ±90°. The high angular resolution is very important because some of measured samples have very small roughness, comparable with wavelength.…”

Section: Figure 4: the Appearance Of Measured Profilesmentioning

confidence: 99%

“…The goniometer GP-200 outputs data in the relative values calibrated to measurement without sample. So, for the correlation of measured and simulated data the same optimization process is fulfilled in simulation as it is explained in [37].…”

Section: Figure 4: the Appearance Of Measured Profilesmentioning

confidence: 99%

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Comparison of BSDF Reconstruction Methods for Rough Surfaces

Sokolov

Potemin

Voloboy³

2022

Proceedings of the 32nd International Conference on Computer Graphics and Vision

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The work is devoted to the problem of reconstruction of a bi-directional scattering distribution functions (BSDF) for rough surfaces. The paper contains short overview of different methods and comparison of their results. The elements with rough surfaces are widely used in modern optical devices, for example, such as light guiding plates for illuminating system of displays, car dashboards, or luminaires. So, accurate and effective reconstruction of scattering properties of rough surfaces is important for visualizations tasks and generation of photorealistic images. Typically scattering properties of rough surface are described with help of BSDF. In some cases, BSDF can be just measured; however in many cases direct measurement is not sufficient. For example, if it is required to define BSDF inside of the material. Such measurement is impossible or too expensive because neither detector of the measuring device nor the light source can be placed inside the material. Therefore, a lot of different approaches to reconstruct BSDF for rough surfaces were developed. The approaches are based on both wave and ray optics and use different analytical and numerical solutions. A great variety of approaches results in the situation when you would like to know what method could be selected as more appropriate for the specific sample. This work investigates a bunch of perspective methods of BSDF reconstruction for surfaces of different roughness. The verification is based on numerical as well as visual comparison with real measured data. Finally, the general conclusions and recommendations are presented about what method and for what applications is more appropriate.

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Section: Resultsmentioning

confidence: 99%

Section: Figure 4: the Appearance Of Measured Profilesmentioning

confidence: 99%

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Comparison of BSDF Reconstruction Methods for Rough Surfaces

Sokolov

Potemin

Voloboy³

2022

Proceedings of the 32nd International Conference on Computer Graphics and Vision

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show abstract

“…The numerical simulations of transmissions models are performed in [17][18][19][20]37]. The "GGX" microfacet model was introduced in [21].…”

Section: Analytical Methods Of Bsdf Reconstructionmentioning

confidence: 99%

Overview of BSDF Reconstruction Methods for Rough Surfaces

Sokolov¹,

Voloboy²,

Potemin³

et al. 2022

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The work provides an overview of methods aimed to the reconstruction of Bidirectional Scattering Distribution Function (BSDF) for rough surfaces. The elements with rough surfaces are permanently present in our life and widely used in modern optical devices, for example, in light guiding plates for display illuminating systems, car dashboards, or luminaires. Light scattering by rough surface is an important component in the visual appearance of many materials including water, glass, skin, etc. The problem of the rough surface visualization is complex and contains many different aspects. Accordingly there are many techniques to provide their realistic rendering. In many lighting simulation and optical design tasks it is sufficient and more effective to replace real geometry of rough surface by a surface optical characteristics expressed via BSDF. So, accurate reconstruction of scattering properties of rough surfaces is a significant factor in visualizations tasks and generation of photorealistic images. In some cases, BSDF can be just measured. However, in many cases direct BSDF measurements are impossible if, for example, it is required to define BSDF inside of the material and neither a measuring device detector nor a light source can be placed inside the material. So this results in the development of many approaches for BSDF reconstruction. It started in the end of the last century with the development of many analytical methods based on microfacet models of rough surface such as the Phong, the Ward reflection, the Cook-Torrance models. Nowadays many direct numerical methods of BSDF reconstruction appear, for example, methods based on normals and heights distribution. As a rule, these methods use ray tracing to calculate BSDF. Sizes of microroughness can be small, sufficient to raise a problem which optics wave or ray is more appropriate here. To answer this and other questions related to BSDF reconstruction, an investigation of well-known and effective reconstruct methods was conducted. This paper also presents the study results for eight real samples with different profile parameters of rough surface. The verification is based on numerical comparison with real measured data and visual comparison of images generated using different reconstructed BSDF. Finally, the general recommendations are presented about what methods and for what applications are more appropriate.

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“…GP-200, GP-700 [6,7] from Murakami Research Laboratory are goniophotometers of one of known Japanese manufacturers of measuring instruments. The GP-200 is a simple desktop measuring setup with wide range of illumination angles up to 85 and with full spatial range of the receiving channel 90.…”

Section: The Base Units Of Bsdf Measurement Devicementioning

confidence: 99%

Portable setup for effective measurement of the surface light-scattering properties

Sokolov

Potemin²,

Zhdanov³

et al. 2022

Optical Design and Testing XII

Self Cite

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The objects with complex scattering properties with rough surfaces and heterogeneous media are widely used in various light-guiding devices, car dashboards, luminaires, and other illuminating systems as elements of scenes aimed to generate images with photorealistic quality. In most cases, such properties are described with Bi-directional Scattering Distribution Functions (BSDF). Typically, such functions are obtained with different measuring devices, like goniophotometers. However, the measurements of such functions are a complex task because of their multidimensional character and complex angular shape. At the present a lot of devices aimed at BSDF measurements have been developed, however all of them have a set of drawbacks, for example, it may be very complex construction, which makes such devices expensive in the manufacturing, or noticeable overall dimensions, what results in their inconvenient not portable usage, low speed of measurements. On the other side, other simpler category of BSDF measuring devices does not have sufficient accuracy, a restricted number of measurement directions, and a very restricted set of functions not allowing to measure such complex optical effects as polarization and fluorescence. In the given paper an original construction of the BSDF measuring device is considered, which does not have the mentioned drawbacks and combines most of the advantages of existing solutions. The proposed measurement setup has small overall dimensions, a simple and cheap construction keeping high accuracy and measurement speed, and a wide set of supported effects like polarization and fluorescence. The advantages of the developed measurement setup are proved with the accurate computer model based on BSDF obtained with the measurements of real samples.

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Simulation of the BSDF measurements for scattering materials with GP-200 goniophotometer for light guiding plates

Cited by 4 publications

References 3 publications

Comparison of BSDF Reconstruction Methods for Rough Surfaces

Comparison of BSDF Reconstruction Methods for Rough Surfaces

Overview of BSDF Reconstruction Methods for Rough Surfaces

Portable setup for effective measurement of the surface light-scattering properties

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