Perspective-Distorted Shadow Maps

This paper proposes a new high-quality hard shadow generation algorithm-perspective-distorted shadow maps (P-DSMs).It combines the advantages of both DSMs and LiSPSMs and complements the disadvantages with each other.The algorithm utilizes DSMs to optimize the shadows generated by LiSPSMs and reduces its dependency on the position of near clip plane, while LiSPSMs is employed to improve the shadow quality of DSMs when the view point is very close to the shadows.P-DSMs reduces the aliasing on shadow edges by redistributing the depth samples in shadow maps and adapts to the dynamic view quite well.Experimental results show that the P-DSMs can generate high quality hard shadows under dynamic view points, even the view point is very close to the shadows.