An Analysis of Goniochromatic and Sparkle Effects on Multi-Layered Materials

Year 2022, , 737 - 746, 19.09.2022

Sermet Mir , Barış Yıldırım , Murat Kurt

https://doi.org/10.21205/deufmd.2022247205

Abstract

Multi-layered materials are layered structures of composing anisotropic media where each layer may have a separate scattering behavior. Multi-layered materials are widely used in cosmetics, jewelry or automobile paint industries. In addition, many real world materials may consist of microscopic particles that can lead to goniochromatic and/or sparkling appearance. Therefore, the accurate representation of these effects is crucial for the photorealistic appearance of the material and many models have been proposed to overcome this problem. In this paper, we analyze various models proposed for representing goniochromatic and sparkle effects and run experiments on their capability of accurately simulating the final appearance of a multi-layered automobile paint structure. We also compare the performance of each model providing their computation times in the experiments. Finally, we provide a table for the readers which summarizes the complex special effects included in each model.

Keywords

Goniochromism, BSDF, Sparkle, SVD, Automobile Paints, Microflake

Supporting Institution

Scientific and Technical Research Council of Turkey (TÜBİTAK)

Project Number

119E092

Thanks

This work was supported by the Scientific and Technical Research Council of Turkey (Project No: 119E092).

Çok Katmanlı Malzemelerde Açısal Renk Değişimleri ve Işıltı Etkilerinin Analizi

Abstract

Çok katmanlı malzemeler, her bir katmanı farklı bir saçılım davranışına sahip olabilen ve katmanları içerisinde anizotropik davranışa sahip bileşenler barındıran malzeme yapılarıdır. Çok katmanlı malzemeler kozmetik, mücevher ve araba boyası endüstrilerinde yoğun olarak kullanılmaktadır. Ayrıca, bir çok gerçek dünya malzemesi kompozisyon içeriğinde açısal renk değişimi (goniochromatic) ve ışıltı (sparkle) etkilerine neden olan mikroskobik parçacıklar içerir. Bu sebeple, malzemenin gerçekçi görselleştirmesini sağlamak için malzemenin doğru temsil edilmesi büyük önem arz etmektedir ve bu doğrultuda bir çok model önerilmiştir. Bu makalede, çok katmanlı modern araba boyası malzemesi baz alınarak, malzemenin üzerinde görülen açısal renk değişimleri ve ışıltı etkilerini modelleyebilen çalışmaların analizi yapılmış ve deneysel karşılaştırmalar ile modellerin örnek malzemeleri doğru temsil etme kapasiteleri karşılaştırılmıştır. Ek olarak, çalışmamız içerisinde modellerin performans değerleri de karşılaştırılarak deneysel çalışmalarımız içerisinde bu bilgiler paylaşılmıştır. En son kısımda ise bir tablo halinde analizi yapılan çalışmaları içerdikleri karmaşık özel etkileri özetleyerek, okuyucuların bilgisine sunmaktayız.

Keywords

Açısal Renk Değişimi, BSDF, Işıltı, SVD, Otomobil Boyaları, Mikro Sedef

Project Number

119E092

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