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Real-time rendering of refracting transmissive objects with multi-scale rough surfaces

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Abstract

This paper presents an efficient approach to render refracting transmissive objects with multi-scale surface roughness, under distant illumination. To correctly capture both fine-scale surface details and large-scale appearances, and enable real-time processing at various viewing resolutions, we first divide the surface roughness into three levels, namely, micro-scale, meso-scale and macro-scale. Each scale of roughness is modeled and evaluated using different strategies, and the overall roughness is approximated by their spherical convolution. Then, this representation is incorporated into a microfacet-based BTDF model, and multi-scale rough refractions are simulated on both front and back sides of an object as light enters and exits the object. In particular, non-linear filtering methods are applied to both macro-scale geometries and meso-scale bumps to reduce aliasing when viewed across a range of distances. Finally, experimental results illustrate that our approach produces resolution-dependent refraction effects that match super-sampled ground truth, while achieving a speed up of several orders of magnitude with hardware acceleration.

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  1. State Key Lab for Novel Software Technology, Nanjing University, Nanjing, China

    Jie Guo & Jin-Gui Pan

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  1. Jie Guo
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  2. Jin-Gui Pan
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Correspondence to Jie Guo.

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Guo, J., Pan, JG. Real-time rendering of refracting transmissive objects with multi-scale rough surfaces. Vis Comput 32, 1579–1592 (2016). https://doi.org/10.1007/s00371-015-1141-8

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