Abstract: Disclosed are a system and method for providing a three-dimensional graphic-user interface operator experience real-time feedback to modification to three-dimensional objects projected onto a computer display screen. Three-dimensional data is modified in surface space and then transformed from surface space to object space and then transformed again so that it can be projected to screen space. In transforming from surface space to object space, the data is characterized so that appropriate steps can be taken to cause the transformation.

Abstract: A method and apparatus for detection and smoothing of jagged edges in a graphics display is described. The edge detection and smoothing is done using only a pixel-map representation of the pixel colors of the image as input. Edges are detected based upon the color representations of certain groups of pixels. Smoothing of the edges is accomplished by adjusting the color of certain pixels in the region of a detected edge. Edges are detected by successively scanning either sets of two rows or sets of two columns of pixels. Edge detection occurs during the row or column scans by discerning certain sequences of color changes between pairs of adjacent pixels. Color changes are detected only if certain threshold changes in color occur between pairs of adjacent pixels. Unless the threshold color change is exceeded, pixels are considered to be the same color and no edge is detected. Jagged edges are detected and smoothed regardless of the type of color representation used in the pixel-map.