1.4 - 泛光

后期处理示例关卡概述,示例1.4: 泛光

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泛光(Bloom) 是一种现实世界中的光现象,通过它能够以较为适度的渲染性能成本极大地增加渲染图像的真实感。用肉眼观察黑暗背景下非常明亮 的物体时会看到泛光效果。亮度更高的物体还会造成其他效果(条纹、镜头光斑),但这些效果不在经典的泛光 效果范畴内。我们的显示器(电视、TFT屏等)通常不支持HDR(高动态范围),因此实际上无法渲染太亮的物体。于是我们模拟了 当光线射到胶片(胶片次表面散射)或摄像机前(乳白色玻璃滤光片)时眼睛中出现的效果(视网膜的次表面散射)。这种效果不一定符合实际 情况,但它可以帮助表现对象的相对亮度,或者给屏幕上显示的LDR(低动态范围)图像添加真实感。

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