Polygonal-functional hybrids for computer animation and games
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© 2010 by Taylor & Francis Group, LLC. The first derivative of the function can be used to compute the gradient and the normal on the object’s surface:Unfortunately, only a small subset of these models is well known to a wider audience. One of the most popular types of implicit surfaces are blobs [Blinn 82], also known as metaballs or soft objects. Individual blobby objects defined by positions of their centers and radii can be smoothly blended with each other. Superposition of these simple primitives provides an opportunity to build more complex shapes with changing topology, which is usually hard to achieve with purely polygonal models.