Silhouette Maps for Improved Texture Magnification

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However, in order to perform this filtering, we are going to have to add extra information to our silhouette map. We can see why if we take a look at the simple example shown here.

Suppose we have a texture with two regions indicated by the blue and green ellipses. We want to filter inside these regions, but not across their boundaries.

As presented at SIGGRAPH/EUROGRAPHICS Graphics Hardware 2004
by Pradeep Sen on August 30, 2004