Hi Folks,

I was having another look at Ken Perlin's 'Improved Noise' paper and I
wanted to compare it to the three noise generators currently in PoV. As I
don't have the source for v3.6 yet I thought I'd see if it was possible to
do in SDL.

With a novel (to me at least) use of spline functions I figured out it was.

Anyway, the image shows isosurface superellipsoids with the surface
purturbed by noise generators 1, 2 and 3 (lower right, lower left and top
right respectively) and the improved noise top left.

The three noise generator ones clearly show the inconsistencies in the
second-derivative (lines on the reflections) and this is much reduced in
the 'new' version of the noise.

So, the gist of this is that I hope someone will put the improved noise into
at least the unofficial PoV builds ...

I'll put the scene file in p.b.s-f in case anyone want's to have a look.

Mike.

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