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Hi guys, welcome back to the channel! In the last three tutorials we covered the Shadow Mapping technique using the basic light types - spot, directional and point light. We also witnessed some of the common problems with Shadow Mapping so today Id like to go over several techniques that can mitigate these problems, to some extent. [intro music] OK so the first problem is shadow acne which is also known as erroneous self shadowing. This is basically a shadow interleaved with non shadowed pixels. The reason for this problem is that the interpolation of the triangle in the shadow pass is different from the interpolation in the lighting pass because these are usually two different view points. This means that there can be minor numerical differences between the depth of the pixel in the two passes. This can cause some pixels to win the shadow test while neighboring pixels would fail. Another problem is that during the lighting pass we may have two neighboring
