HDR
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一张截取自
半衰期2:失落的海岸线的过度曝光效果图片

HDR(高动态范围光照)会模拟一台电脑能够显示的真实动态光照,这一效果的主要运行方式就是让周围区域的「高光溢出(Blooming)」的颜色亮度超过100%,并调整虚拟镜头的光圈来抵消所有曝光过度的部分。
除了明显的效果之外(见右图),HDR还会营造更丰富的颜色效果和更细致的渐变效果:由于亮和暗的区域会被显示为纯白和纯黑,修正曝光的区域属性会被渲染的更远和更宽。
在起源引擎中的运用
起源引擎的HDR模拟的并不是很真实,因为那里的镜头有着比人眼视角更宽的视觉范围,并能看的更远,而且还能更快的适应光线变化,不过这些都能更有效提高游戏性,特别是在多人游戏中。
实际上起源引擎根本没有建立任何「适当的」HDR效果:反而把图像降解成LDR效果,不过大多数人看不出其中的区别。实际上,这能让游戏完全兼容DX9 GPU和MSAA,并带来更好的优化效果。
参见

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