March 2013
Intermediate to advanced
984 pages
26h 18m
English
book
OpenGL Programming Guide: The Official Guide to Learning OpenGL, Version 4.3, Eighth Edition
by Dave Shreiner, Graham Sellers, John M. Kessenich, Bill M. Licea-Kane
Content preview from OpenGL Programming Guide: The Official Guide to Learning OpenGL, Version 4.3, Eighth EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Noise Functions
Portability Note: Built-in noise functions are not reproducible from platform to platform. Verify their support and appearance on all platforms you care about.
Noise functions can be used to increase visual complexity. Values returned by the following noise functions give the appearance of randomness but are not random. Rather, they give the same result for the same input, allowing reproduction of the same variance from frame to frame.
The noise functions below are defined to have the following characteristics:
• The return value(s) are always in the range [–1.0, 1.0], and cover at least the range [–0.6, 0.6], with a Gaussian-like distribution.
• The return value(s) have an overall average of 0.0.
• They are repeatable, in that ...