Abstract
Fast recovery in solid modelling design is an important aid for users of CAD systems. A stacked frame buffer algorithm for solid modelling is proposed. This buffer is constructed as a multiframe array whose cells are maintained in an order according to priority of procedure linked to each pixel in terms of x and y elements on the image plane, so that the cells' contents may describe the visibility of current objects as well as the history of visible ones through the modelling process. The algorithm directly processes image data in the display buffer as it runs and recovers step-by-step. Using this method, problems of rapidly recovering from inadvertent operating errors and immediately modifying objects in the CAD process are solved.
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