Set this constant to a non-zero value to enable diagnostic messages to be printed or set it to zero to suppress them.
将这个常量设置为非零值，以便显示诊断消息；或者将其设置为零，以便抑制诊断消息。
If you don't need diffuse scatter, just set it to zero.
如果你不需要，可以把它设为零。
If you don't need diffuse scatter, just set it to zero.
如果你不需要，可以把它设为零。
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