A multiscale model for rain rendering in real-time

•Natural phenomena.•Rain.•Physically-based.•Real-time rendering.•Attenuation.•Extinction.

This paper presents a coherent multiscale model for real-time rain rendering which takes into account local and global properties of rainy scenes. Our aim is to simulate visible rain streaks close to the camera as well as the progressive loss of visibility induced by atmospheric phenomena. Our model proposes to correlate the attenuation of visibility, which is due in part to the extinction phenomenon, and the distribution of raindrops in terms of rainfall intensity and camera׳s parameters. Furthermore, this method proposes an original rain streaks generation based on spectral analysis and sparse convolution theory. This allows an accurate control of rainfall intensity and streaks appearance, improving the global realism of rainy scenes.

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