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From: srneely@watcgl.UUCP (Shawn Neely)
Newsgroups: net.graphics
Subject: solid texture
Message-ID: <356@watcgl.UUCP>
Date: Sun, 23-Feb-86 22:35:36 EST
Article-I.D.: watcgl.356
Posted: Sun Feb 23 22:35:36 1986
Date-Received: Wed, 26-Feb-86 05:52:33 EST
Distribution: net
Organization: U of Waterloo, Ontario
Lines: 14


In the SIGGRAPH '85 proceedings Ken Perlin describes a solid texture
function called Noise() which has, among other properties, statistical
invariance under rotation. An algorithm is given for computing the
function by smooth interpolation of pseudo-random values on an integer
lattice. This method gives a texture which has a slight but noticeable
grain along the coordinate axes.

Has anyone else experimented with this function? I have played with
the notion of a "gravity field" whereby the function value at a given
point is determined by its distance to neighbouring pseudo-random "masses",
but I still have undesirable correlation with the coordinate system.

Any suggestions?