Chapter 18
Light
In this chapter, we discuss the practical issues of measuring light, usually called radiometry. The terms that arise in radiometry may at first seem strange and have terminology and notation that may be hard to keep straight. However, because radiometry is so fundamental to computer graphics, it is worth studying radiometry until it sinks in. This chapter also covers photometry, which takes radiometric quantities and scales them to estimate how much “useful” light is present. For example, a green light may seem twice as bright as a blue light of the same power because the eye is more sensitive to green light. Photometry attempts to quantify such distinctions.
18.1 Radiometry
Although we can define radiometric units in many systems, ...
Get Fundamentals of Computer Graphics, 4th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
