漫射光色反射从一个方向来的光，因此对于径直照射的表面来说就比仅是光线斜射过的表面更为明亮。
Diffuse color reflects light that comes from one direction, so it's brighter if it comes squarely down on a surface that if it barely glances off the surface.
这一方法的严重缺点是漫射器反射比随时间变化。
A serious drawback is that the diffuser's reflectance may change with time.
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