Category Archives: Algorithmic Art

Procedural Color Transformations

Color grading was fun. It was cool. But it was hand-written.

In the true style of Limit Theory, let us give the computer the freedom. Allow it to generate procedural color transformations. An interpolated, n-point bezier grade applied (independently) to color channels. Control points generated using fractal noise. And now, you no longer have something that is cool, but rather, something truly magical. To watch the computer apply new artistic interpretations to the same image. This is Limit Theory :)

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Searching for a Home

Searching for the perfect place to call home. Not that it would matter, since I haven't been saving the seeds. It's nice to think that maybe someday I could fly my ship right down through one of these atmospheres, pitch a tent and spend a year exploring. It will be a happy day when I finally do implement seamless landing. Maybe in a year or two :)

Procedural Planet
Procedural Planet
Procedural Planet
Procedural Planet (Home?)

I think the last one is my favorite :)

I think Earth-like planets are pretty much done for now. Still need to fix the distortion in those clouds, though. Maybe add a little variation to the clouds as well.

Planets...Again

A while ago I said I wasn't going to get caught up in planets. I lied. Oh well :/

Better scattering, better surface functions, better storage of textures (using cubemaps now instead of cylindrical maps for less distortion), better clouds, and finally some "real" bumpmapping via dynamic heightmap marching. Overall, pretty big improvement in visual appeal! Still needs more interesting/detailed color.

New Procedural Planets

Procedural Nebulae V

Naturally, I can't leave well enough alone!  Attempt IV was pretty cool, but it obviously lacked volume.  No surprises there: it was 2D.  Here's my first attempt at volumetric light inside of the same type of nebula as shown in the previous post.  I'm sure it will get better over time, but already you can notice a much better sense of volume, softness/cloudiness, and of light transport.  Light is correctly modeled using emissitivity and absorption as it passes through the nebula. I'd say this is a pretty good amount of nebula-related progress for 2 days!!

Procedural Volumetric Nebula
Procedural Volumetric Nebula
Procedural Volumetric Nebula

This method is about as expensive as the current LT nebulae...but it looks way better...so I think it's safe to say this will be replacing them soon :) I am very happy with these, and I think I would quite enjoy seeing them in the background!  All the parameters - softness, brightness, feature size, absorption, wavelength-dependence of scattering, etc. are all easily-tweakable to get a lot of different styles.

Oh, and looks like we also get clouds for free! :)

Procedural Volumetric Clouds
Procedural Volumetric Clouds

Procedural Nebulae IV

Tonight, I feel like I have closed a chapter in my life.  For almost three years, I have been trying, on and off, to understand nebulae.  In particular, I've been trying to generate them procedurally.  If you look back over the log, you'll find several attempts:

2010 ~ http://joshparnell.com/blog/2010/08/14/procedural-nebulae/

2010 ~ http://joshparnell.com/blog/2010/08/25/procedural-nebulae-ii/

2011 ~ http://joshparnell.com/blog/2011/07/24/procedural-nebulae-2/

2012 ~ http://joshparnell.com/blog/2012/01/19/procedural-nebulae-3/

2012 ~ http://joshparnell.com/blog/2012/02/24/procedural-nebulae-revisited/

2013 ~ http://joshparnell.com/blog/2013/01/14/procedural-nebulae-iii/

Arguably, I've been getting better over the years.  As my understanding of math improves, so does my ability to craft these lovely things.  Although 2013's nebulae are significantly better than the rest (and, arguably, some of the better procedural nebulae out there on the web), let's face it, they still don't look like nebulae.  But tonight, tonight I think that I have discovered the secret of nebulae.  After three years, I finally feel that I understand these things.  And I'm proud to say that my nebulae...finally look like nebulae.

 

Procedural Nebulae, Three Years Later

 

In yet another attempt to drive the lesson of simplicity into my mind, the universe has shown me that nebulae - in my opinion, some of the most gorgeous and complex objects out there - are actually simple. The image above was produced by 31 lines of code, which is far, far less than any of my previous attempts. The code that actually defines the nebulae itself is about 20 lines. Dead simple.

:)