虽然IFS的理论要求每个功能都是收缩的,但实际上实现IFS的软件只要求整个系统平均是收缩的。<ref>{{cite web |last=Draves |first=Scott |author2=Erik Reckase |date=July 2007 |url=http://flam3.com/flame.pdf |title=The Fractal Flame Algorithm |format=pdf |accessdate=2008-07-17 |archive-url=https://web.archive.org/web/20080509073421/http://flam3.com/flame.pdf |archive-date=2008-05-09 |url-status=dead }}</ref> | 虽然IFS的理论要求每个功能都是收缩的,但实际上实现IFS的软件只要求整个系统平均是收缩的。<ref>{{cite web |last=Draves |first=Scott |author2=Erik Reckase |date=July 2007 |url=http://flam3.com/flame.pdf |title=The Fractal Flame Algorithm |format=pdf |accessdate=2008-07-17 |archive-url=https://web.archive.org/web/20080509073421/http://flam3.com/flame.pdf |archive-date=2008-05-09 |url-status=dead }}</ref> |