作业7 light的m_emission辐射量问题？

[uerth]

main.cpp 第25行
Material* light = new Material(DIFFUSE, (8.0f * Vector3f(0.747f+0.058f, 0.747f+0.258f, 0.747f) + 15.6f * Vector3f(0.740f+0.287f,0.740f+0.160f,0.740f) + 18.4f *Vector3f(0.737f+0.642f,0.737f+0.159f,0.737f)));

m_emission=8.0f * Vector3f(0.747f+0.058f, 0.747f+0.258f, 0.747f) + 15.6f * Vector3f(0.740f+0.287f,0.740f+0.160f,0.740f) + 18.4f *Vector3f(0.737f+0.642f,0.737f+0.159f,0.737f)

其中的8.0f,15.6f,18.4f
0.747f,0.74f,0.737f
｛0.058f,0.258f,0.0f｝，｛0.287f,0.160f,0.0f｝，｛0.642f,0.159f,0.0f｝
这些值如何求出来的，为什么这么定义？
或者我能通过学习什么方面知识去求出这些值？

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