SH lighting is very low frequency. You can't have sharp lighting transitions with SH lights. They are also only affecting the diffuse lighting (too low frequency for specular highlights).

球面调和光只有很低的频率。球面调和光不能产生锋利的照明过渡。它们也只会影响散射光照（对高光来说，球面调和光的频率太低了）。

youdao

SH lighting is very low frequency. You can't have sharp lighting transitions with SH lights. They are also only affecting the diffuse lighting (too low frequency for specular highlights).

球面调和光只有很低的频率。球面调和光不能产生锋利的照明过渡。它们也只会影响散射光照（对高光来说，球面调和光的频率太低了）。

youdao