Anti-Aliasing Shadow Maps Based on Data Shift

An improved shadow ant-i aliasing method based on percentage closer filtering （PCF） and named as data shift PCF is presented to generate rea-l time shadows in computer graphics.The primary idea is to make sawtooth shadow edges straight by data shift before bilinear interpolation in PCF.The algorithm is implemented with graphic hardware using Pixel Shader2.0,several examples show that most of aliasing artifacts have been removed compared with PCF alone.