void setBackSideBrightness(double brightness);

Sets the back side brightness as a ratio of the front side brightness.

The surface of a surface chart has two sides. The side that is facing the positive z direction of the plot region is the front side. The side that is facing the negative z direction of the plot region is the back side.

By default, the back side brightness is half the front side brightness. This method can be used to adjust the ratio.

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