The Quest for Ultimate Realism and Speed
In this last chapter, we cover a number of topics that are the subject of ongoing research. Indeed, the quest for realism and speed has not yet come to an end.
While deriving the rendering equation in Chapter 2, several restrictions were imposed on light transport. We assumed that wave effects could be ignored and that radiance is conserved along its path between mutually visible surfaces. We also assumed that light scattering happens instantaneously; that scattered light has the same wavelength as the incident beam; and that it scatters from the same location where it hits a surface. This is not always true. We start this chapter with a discussion of how to deal with participating media, translucent ...