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Half Lambert

Half Lambert

  Half Lambert was a technique created by Valve as a way of getting the lighting to show the surface of an object in low-light areas. It basically brightens up the diffuse lighting of the Material and wraps the diffuse light around an object‘s surface. 

  Half Lambert用于在低光照环境下让物体显得更亮的算法。该算法提高了diffuse的亮度。

  

  可以看到,和普通的Lambert相比,difLight不再clamp到0-1,而是保持(-1)-1,然后乘以0.5+0.5转换到0-1区间。

  通过这种转换,加强了法线的点积值,即加强的光照。

  

  The following shows the diffuse value mapped to a function graph, showing the result of the Half Lambert calculation: 

  

  

Half Lambert