As it is a NP-complete combinatorial optimization problem, it is difficult to obtain the optimal or satisfying solution with the increase of the problem scale.

由于该问题是一个NP -完全组合优化问题，随着问题规模的扩大，往往难以求得最优或满意的机器配置方案。

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As its calculation complexity is far more than that of local illumination, there has been yet few satisfying solution which achieves high quality and performance simultaneously.

由于其计算复杂度远远超过了局部光照计算，传统上全局光照明模拟难以同时获得实时的绘制效率和逼真的效果。

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