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This effect fills the area inside a path with a squiggly line that simulates quick, hand-drawn shading. Shapes are automatically converted to paths. Note: the squiggly line is constructed like a calligraphic stroke, that is by two almost parallel lines. This allows for variations in line thickness. You may get better results by adding a Fill and removing the Stroke (not automatically done by the effect). Warning: this effect appears to make heavy demands on the CPU.
There are a great many options to control the way the hatches are drawn. The spacing, direction, and amount of bend are determined by on-canvas nodes, visible when the Node Tool is in use. The other options are controlled in the Path Effect Editor dialog. Many of the options have a random factor. One can “re-roll the dice” by clicking on the randomize () icon.