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    科学领域:

    • 计算机图形 计算机图形
    • 染技术 染技术
    • 材料模拟 材料模拟

    背景情况:

    • 实时地下散射对于染半透明材料至关重要.
    • 现有的屏幕空间和大距离方法在准确性和效率方面存在局限性.
    • 双向散射-表面反射分布函数 (BSSRDF) 模型是计算密集的.

    研究的目的:

    • 开发一种新的,高效的实时地下散射算法,以改进远距离散射.
    • 在染的半透明材料中增强照明细节和半透明效果.
    • 克服现有的屏幕空间和大距离散射方法的局限性.

    主要方法:

    • 将光子束扩散 (PBD) 模型扩展到光视图和屏幕空间.
    • 在媒介内嵌入的折射束用于散射估计.
    • 利用在屏幕空间中的自适应采样和虚拟源来有效估计PBD贡献.
    • 实施了校正因子,以使结果与路径跟踪引用保持一致.

    主要成果:

    • 在现有方法中,实现实时性能,结果最接近路径跟踪引用.
    • 展示了改善的前面照明细节和背光透光效果.
    • 与以前的远距离散射方法相比,性能明显加快.

    结论:

    • 拟议的PBD算法为实时地下散射提供了一个高效和准确的解决方案.
    • 这种方法提高了计算机图形中的半透明材料的视觉质量.
    • 该方法为光子束在散射估计中的利用提供了新的考虑.