而且如果说有多个光源的话，为什么每个物体只有一个影子呢？
And if there are multiple light sources, why does each object only cast one shadow?
确保你有多个光源，并且它们能间接避开黑影或脸部发亮的效果。
Ensure you have several light sources and that they are all indirect to avoid dark shadows or a shiny-face effect.
图5a与图5 B示出了使用多个泵浦光源的实施例。
FIGS. 5a and 5b illustrate embodiments in which multiple pump light sources are used.
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