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140 CHAPTER 5
Illumination
The Illumination tab controls how the illumination affects the rendering of the strokes.
High Threshold value Low Threshold value With higher Shade Levels value
Show Dark Strokes, Show Light Strokes
Enable these options to switch on dark stokes and light strokes.
Shade Levels
In general, the higher you set this value, the more strokes you get in dark areas and the less faded
the hatching looks. It works by overlaying layers of strokes (the Shade Levels value denes the
number of layers), where each layer is more and more affected by the illumination.
Threshold
The Threshold controls how quickly the strokes fade out. See the examples above.