Interactive and Realistic Visualization System for Earth-Scale Clouds
Interactive and Realistic Visualization System for Earth-Scale Clouds
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发表时间：
2009
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通讯作者：
Y. Dobashi;Tsuyoshi Yamamoto;T. Nishita
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作者：
Y. Dobashi;Tsuyoshi Yamamoto;T. Nishita
本文介绍了一个用于真实感可视化地球尺度云的交互系统。可以以交互的帧速率生成逼真的图像，同时可以交互地改变视点和太阳光方向。要逼真地显示地球尺度的云，需要渲染表示云密度分布的大数据量。然而，这通常是耗时的，很难实现交互性能，特别是在阳光方向可以改变的情况下。为了解决这一问题，我们的系统预先计算了不同视角和阳光方向的云的综合强度和不透明度。这一思想与一种新颖的分层数据结构相结合，以进一步加速。通过考虑大气效果和地球上云的阴影，最终图像的照片真实感得到了改善。通过在航天飞行仿真中的应用，验证了该系统的有效性。
This paper presents an interactive system for realistic visualization of earth-scale clouds. Realistic images can be generated at interactive frame rates while the viewpoint and the sunlight directions can be changed interactively. The realistic display of earth-scale clouds requires us to render large volume data representing the density distribution of the clouds. However, this is generally time-consuming and it is difficult to achieve the interactive performance, especially when the sunlight direction can be changed. To address this, our system precomputes the integrated intensities and opacities of clouds for various viewing and sunlight directions. This idea is combined with a novel hierarchical data structure for further acceleration. The photorealism of the final image is improved by taking into account the atmospheric effects and shadows of clouds on the earth. We demonstrate the usefulness of our system by an application to a space flight simulation.