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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.
Post a reply to this message
Attachments:
Download 'noise.jpg' (24 KB)
Preview of image 'noise.jpg'
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From: Slime
Subject: Re: Perlin's Improved Noise comparison ... (24K)
Date: 29 Jun 2004 15:51:13
Message: <40e1c831@news.povray.org>
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> So, the gist of this is that I hope someone will put the improved noise
into
> at least the unofficial PoV builds ...
I've done this in Slime-POV ( http://www.slimeland.com/slimepov/ ), but that
was based on POV-Ray 3.5.
- Slime
[ http://www.slimeland.com/ ]
Post a reply to this message
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From: Slime
Subject: Re: Perlin's Improved Noise comparison ... (24K)
Date: 29 Jun 2004 17:22:54
Message: <40e1ddae@news.povray.org>
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> I'll put the scene file in p.b.s-f in case anyone want's to have a look.
Woah, you wrote this in SDL? What was the render time like? Was it
acceptable? If so, you should make this into an include file.
- Slime
[ http://www.slimeland.com/ ]
Post a reply to this message
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"Slime" <fak### [at] email address> wrote:
> > I'll put the scene file in p.b.s-f in case anyone want's to have a look.
>
> Woah, you wrote this in SDL? What was the render time like? Was it
> acceptable? If so, you should make this into an include file.
>
> - Slime
> [ http://www.slimeland.com/ ]
Yes - SDL. The awkward bit was figuring out how to produce the 3D hashing
function, but then I realised that I could use a spline function for array
lookup; just put the array values at integer points along the spline and
voila!
Render time was 22min on a 1GHz Athlon at 800x600, about 90% of the time
spent on the top half ... so it's not really that useable in real scenes.
Mike.
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