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The field spectroradiometer was used to measure spectra of different snow and snow-covered land surface objects in Beijing area. For a pure snow spectrum, the snow reflectance peaks appeared from visible to 800 nm band; there was an obvious absorption valley near the 1030 nm wavelength. Comparing with fresh snow, the reflection peaks of the old snow and melting snow showed decline to varying degrees...
This paper describes an approach to the approximation of Loop subdivision surfaces for real-time rendering. The approach consists of two phases, which separately construct the approximation geometry and the normal field of a subdivision surface. It first exploits quartic triangular Bézier patches to approximate the geometry of the subdivision surface by interpolating a grid of sampled...
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