When processing a design file there are two distinct ways the laser system handles different elements of the design. Raster motion (overlapping left-to-right/right-to-left movement of the optics carriage) is used for laser engraving, marking, and photo imaging.
ULS laser system control software parses design files for bitmap images, text, and filled areas, and interprets these elements as raster objects. It then automatically calculates raster processing patterns for the laser system. Overlapping left-to-right/right-to-left motion creates a filled rectangle, shown below:
