Difference between revisions of "Seedable PRNG"
Jump to navigation
Jump to search
Huney Jewell (talk | contribs) m (Avoid line overflow) |
m (link with: llFrand, llListRandomize, Pseudo-random_Number_Generator) |
||
| Line 1: | Line 1: | ||
{{LSL Header}} | {{LSL Header}} | ||
See also: [[llFrand]], [[llListRandomize]], [[Pseudo-random_Number_Generator]] | |||
== md5 based seedable PRNG == | == md5 based seedable PRNG == | ||
Revision as of 19:08, 2 October 2007
| LSL Portal | Functions | Events | Types | Operators | Constants | Flow Control | Script Library | Categorized Library | Tutorials |
See also: llFrand, llListRandomize, Pseudo-random_Number_Generator
md5 based seedable PRNG
It's not the fastest thing but it doesn't seem to have much if any output skew, and I couldn't detect any periodicity in the first 100,000 cycles.
//new md5 based seedable PRNG
//By: Gigs Taggart
//Released under BSD License.
//http://www.opensource.org/licenses/bsd-license.php
integer gSeed=0;
string gLastHash;
prng_seed(integer seed)
{
gSeed=seed;
}
integer prng_get()
{
gLastHash=llMD5String(gLastHash, gSeed);
//the bitwise thingy gets rid of negative numbers
return (integer)("0x" + llGetSubString(gLastHash, 0, 7)) & 0x7FFFFFFF; }