Abstract
The basic idea of pre-integrated volume rendering is the precomputation of the parts of the volume rendering integral. In this sense, it is similar to volume rendering using splatting and even more similar to the accelerated evaluation of the volume rendering integral within a tetrahedron. However, pre-integrated volume rendering is a more general concept that can be applied to many volume rendering algorithms and supports several different rendering techniques. This chapter begins with describing the foundation of pre-integrated volume rendering—that is, pre-integrated classification, and discusses its relation to the volume rendering integral and its numerical evaluation. Pre-integrated classification is not restricted to a particular volume rendering algorithm; rather, it may replace the post-classification step of various algorithms as demonstrated by several publications in recent years. The chapter also attempts to give an overview of the literature on pre-integrated volume rendering algorithms.
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