Pixel Accurate Shadows with Shadow Mapping

Shadow mapping is a popular technique for shadow generation. However, it is still a difficult problem to generate high quality shadows in real time framerates for arbirary scenes. This work summarizes state-of-the-art techniques to achieve pixel accurate shadows and points out the various problems of generating artifact free shadows. Furthermore, we present a new technique that uses multiple jittered shadow maps with confidence-based accumulation to simulate shadow map resolutions beyond hardware capabilities. With a screen-spaced evaluation method we can guarantee pixel correct shadows.