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학술지 Adaptive B-Spline Volume Representation of Measured BRDF Data for Photorealistic Rendering
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박형준, 이주행
Journal of Computational Design and Engineering, v.2 no.1, pp.1-15
한국CAD/CAM학회, Elsevier
15PC5100, 로봇 적용 범위 확장을 위해 3종의 조인트 모듈, 최대 7자유도의 기구부 조합에 따른 제어, 인지 시스템의 자동 구성이 가능한 모듈라 매니퓰레이션 기술 개발, 김재홍
Measured bidirectional reflectance distribution function (BRDF) data have been used to represent complex interaction between lights and surface materials for photorealistic rendering. However, their massive size makes it hard to adopt them in practical rendering applications. In this paper, we propose an adaptive method for B-spline volume representation of measured BRDF data. It basically performs approximate B-spline volume lofting, which decomposes the problem into three sub-problems of multiple B-spline curve fitting along u-, v-, and w-parametric directions. Especially, it makes the efficient use of knots in the multiple B-spline curve fitting and thereby accomplishes adaptive knot placement along each parametric direction of a resulting B-spline volume. The proposed method is quite useful to realize efficient data reduction while smoothing out the noises and keeping the overall features of BRDF data well. By applying the B-spline volume models of real materials for rendering, we show that the B-spline volume models are effective in preserving the features of material appearance and are suitable for representing BRDF data.
Adaptive knot placement, Approximate volume lofting, B-spline volume, Data reduction, Measured BRDF
KSP 제안 키워드
B-Spline curve fitting, Data reduction, Material appearance, Photorealistic Rendering, adaptive method, bidirectional reflectance distribution function(BRDF), sub-problems