Tor Olav Kristensen wrote:
> 
> 29. June Mike Andrews posted an image to
> povray.binaries.images:
> "Perlin's Improved Noise comparison ... (24K)"
> 
> The same day he also posted code for his test image to
> povray.binaries.scene-files:
> "Perlin's Improved Noise - SDL version"
> 
> I have now had a look at his code and have made a macro
> that can produce noise functions that don't have the
> "defects" of earlier Perlin noise functions. (I haven't
> really verified this, but the results seems ok so far.)

There are two critical issues about the noise generator: 1) possible 
regularities.  This does not only mean regular structures in the noise 
pattern like in current ng3 but also periodicity and degeneration of the 
function in 'far areas'.  This all can be really tricky to test of 
course.  2) performance.  This is quite impossible to conclude from an 
SDL version.

Christoph

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