April 2016
Intermediate to advanced
784 pages
18h 25m
English
Content preview from Ray Tracing from the Ground Up
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Chapter 6
Mapping Samples to a Disk
Objectives
By the end of this chapter you should:
- understand the requirements for a good mapping technique from a square to a disk;
- understand how the concentric map is implemented.
We require sample points distributed on a unit disk for the simulation of depth of field with a circular camera lens in Chapter 10 and for shading with disk lights in Chapter 18. As we can already generate samples on a unit square, it’s natural to generate these as before and then map them to a unit disk. Although a number of techniques can be used for this task, some are better than others.
The basic requirement for a good mapping ...
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