four pointer antialiasing method removes staircase artifacts at
polygon boundaries in a second render pass.
computer graphic cards have achieved satisfactory performance on texture
antialiasing, e.g. by using mip-mapping. Most scene-antialiasing methods, such
as super-sampling, however, still require a rendering effort proportional
to the desired quality and therefore affect performance. The four-pointer method is a novel scene
antialiasing method. For each pixel, the algorithm stores not only the
color at the pixel center (point sampling), but also a mask describing how the error caused by point-sampling can be corrected
by mixing-in color from neighbored pixels. In a second pass, this
additional information is used to remove artifacts from the
rendered image. Compared to super-sampling, this method is several times
more time and space efficient.