Shadows are essential elements in computer-generated scenes. Shadow mapping is one of the most popular techniques for rendering shadows in real-time applications which is widely supported in current graphics hardware with its flexibility independence to the complexity of the scene. However, the standard shadow maps suffer from aliasing artifacts due to finite resolution and bias problems. In this paper, we survey the most promising research results that have been achieved recently and conclude by discussing some of the most important challenges of shadow aliasing.
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