rsqrt()

Purpose

Find the fast inverse square root of the specfied number

Description

Returns the reciprocal (or multiplicative inverse) of the square root of a number. This operation is used in digital signal processing to normalize a vector (scale it to length 1.) e.g. in computer graphics inverse square roots are used to compute angles of incidence and reflection for lighting and shading.

Syntax

result = rsqrt( number )

Arguments

number The number to find the reciprocal square root of

result The reciprocal square root (1/square root) of the number

Example

num = 10
print( rsqrt( num ) )
update()
sleep( 3 )

Associated Commands