The SCurveTonemap effect maps the luminance of each pixel in the Scene according to an s-shaped curve:

The curve has three parts. The toe area determines the shadows, and is governed by toeSlope and toeEmphasis . The middle part determines overall contrast, and is changed by contrastBoost 。 shoulder area determines the highlights, and is governed by shoulderSlope and shoulderEmphasis .

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contrastBoost : real

Enhances or reduces the overall contrast of the tonemap. This changes the slope of the middle part of the s-curve.

The range is [-1...2] 。默认值为 0 .

exposureValue : real

Specifies the exposure for the tonemap effect. This value is only used if useExposure is true . The range is [0.01...16] 。默认值为 1 .

gammaValue : real

Sets the gamma value for the tonemap effect. Sensible values are in the range [0.1...8] 。默认值为 2.2 .

saturationLevel : real

Sets the overall saturation level of the tonemap effect. The range is [0...2] ，采用 0 being fully grayscale and 2 being very oversaturated. The default value is 1 .

shoulderEmphasis : real

Modifies the shape of the shoulder part of the s-curve. The range is [-1...1] 。默认值为 0 .

另请参阅 shoulderSlope .

shoulderSlope : real

Sets the slope of the shoulder part of the s-curve. The shoulder defines where highlights lose contrast.

The range is [0...3] 。默认值为 1 .

另请参阅 shoulderEmphasis .

toeEmphasis : real

Modifies the shape of the toe part of the s-curve. The range is [-1...1] 。默认值为 0 .

另请参阅 toeSlope .

toeSlope : real

Sets the slope of the toe part of the s-curve. The toe defines where shadows lose contrast.

The range is [0...3] 。默认值为 1 .

另请参阅 toeEmphasis .

useExposure : bool

Makes the effect use whitePoint 而不是 exposureValue for luminance calculations. The default value is false .

whitePoint : real

Sets the white point of the tonemap. This value is only used if useExposure is false . The range is [0.01...128] 。默认值为 1 .