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Efficient rendering of caustics with streamed photon mapping

Guzek K., Napieralski P.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2017

Vol. 65, nr 3

361--368

In this paper, we present the streamed photon mapping method for enhancing the rendering of caustics. In order to achieve a realistic caustic effect, global illumination methods require additional data, which are gathered by creating a caustic map or increasing the number of samples used for rendering. Our method employs a stream of photons with a varying luminance level depending on the material properties of the surface. The application of a concentrated photon stream provides the ability to render caustics effectively without increasing the number of photons in a photon map. Such an approach increases visibility of results, while also allowing for faster computations.

Contact caustics measurements expanded to anisotropic materials

Bakic A., Semenski D., Jecic S.

Archives of Civil and Mechanical Engineering

2011

Vol. 11, no 3

497-505

Regions with high stress gradients represent critical zones of engineering structures, such as crack tip or vicinity of the contact zone. The optical method of caustics is one of the few experimental methods which provide applicable results in these locations. This method was originally developed for crack-tip measurements of stress intensity factors and J-integral for isotropic and then for anisotropic materials. Subsequently, it was extended to the contact problems, where the size and the shape of caustics are related to the amount and the inclination of loading force. Here, the application of the method of caustics is extended to the analysis of contact problems for mechanically anisotropic materials. This makes the caustics method widely applicable to the analysis of any high stress gradient locations in a structure.

Obszary z dużym gradientem naprężeń jak wierzchołki pęknięć oraz miejsca kontaktu są krytyczne dla konstrukcji inżynierskich. Optyczna metoda Caustic jest jedyną z kilku metod dostarczających informacji o tych obszarach. Metoda ta została rozwinięta w celu badania wierzchołka pęknięć, następnie adaptowana dla problemów kontaktowych. W pracy przedstawiono zastosowania tej metody do analizy problemów kontaktowych materiałów anizotropowych.