The Extrude filter, as one of the group of Stylize filters, projects the photo onto a series of extruded shapes that seem to explode from the middle of the document.
By altering the settings in the filter’s dialog you can choose the shape of the extrusions - blocks or pyramids (1). The size (2) and depth (3) of the extruded shapes can be set in pixels. Partly completed blocks can be masked or shown as part of the final image ...
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