Fast Inverse Square Root
Hexadecimal, Multiplicative inverse, Single-precision floating-point format
978-620-0-80095-4
6200800952
88
2012-03-02
34,00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Fast inverse square root is a method of calculating x-½, the reciprocal of a square root for a 32-bit floating point number in IEEE 754 floating point format. The algorithm was probably developed at Silicon Graphics in the early 1990s, and an implementation appeared in 1999 in the Quake III Arena source code, but the method did not appear on public forums such as Usenet until 2002 or 2003. At the time, the primary advantage of the algorithm came from avoiding computationally expensive floating point operations in favor of integer operations. Inverse square roots are used to compute angles of incidence and reflection for lighting and shading in computer graphics.
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