Browsing by Author "Steinberg, Shlomi"

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    Analytic Spectral Integration of Birefringence-Induced Iridescence
    (The Eurographics Association and John Wiley & Sons Ltd., 2019) Steinberg, Shlomi; Boubekeur, Tamy and Sen, Pradeep
    Optical phenomena that are only observable in optically anisotropic materials are generally ignored in the computer graphics. However, such optical effects are not restricted to exotic materials and can also be observed with common translucent objects when optical anisotropy is induced, e.g. via mechanical stress. Furthermore accurate prediction and reproduction of those optical effects has important practical applications. We provide a short but complete analysis of the relevant electromagnetic theory of light propagation in optically anisotropic media and derive the full set of formulations required to render birefringent materials. We then present a novel method for spectral integration of refraction and reflection in an anisotropic slab. Our approach allows fast and robust rendering of birefringence-induced iridescence in a physically faithful manner and is applicable to both real-time and offline rendering.
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    High-Performance Elliptical Cone Tracing
    (The Eurographics Association and John Wiley & Sons Ltd., 2025) Emre, Umut; Kanak, Aryan; Steinberg, Shlomi; Christie, Marc; Pietroni, Nico; Wang, Yu-Shuen
    In this work, we discuss elliptical cone traversal in scenes that employ typical triangular meshes. We derive accurate and numerically-stable intersection tests for an elliptical conic frustum with an AABB, plane, edge and a triangle, and analyze the performance of elliptical cone tracing when using different acceleration data structures: SAH-based K-d trees, BVHs as well as a modern 8-wide BVH variant adapted for cone tracing, and compare with ray tracing. In addition, several cone traversal algorithms are analyzed, and we develop novel heuristics and optimizations that give better performance than previous traversal approaches. The results highlight the difference in performance characteristics between rays and cones, and serve to guide the design of acceleration data structures for applications that employ cone tracing.