Effect Mesh
Applies certain effects at intervals across the image.
Line Interval - The gap between the lines.
Line Factor - Variant line factor (used with certain effect control settings)
Effect Factor 1 - The effect factor, so if an emboss it will be the x direction for the emboss or perhaps a negative value (depends on the effects controls)
Effect Factor 2 - As above (not used in all cases)
Threshold - Uses the source and the threshold of the average of RGB to apply effect
Effects control - Direction of effect
Effects control 2 - Effect to be applied such as emboss or greyscale or inverse.
Effects control 3 - Variant lines
To Line Checkbox - Apply to the line or the bits in between.