Eric B posted Feb 5 at 10:56 pm
I was hoping that switching the center parameter's keys to smooth interpolation would result in a smooth change of direction in a zoom animation. A gentle, natural-looking curve instead of an abrupt turn-on-a-dime. But the interpolation settings don’t seem to have any effect. It's always the same sharp turn halfway through.

Smooth interpolation:

Linear interpolation:

recent by Eric B  ·  5 days ago at 11:16 pm
physicist posted Feb 9 at 2:21 pm
This is allowed in the default section of a ucl coloring formula, but not in a GradientColoring plug-in.

Apparently I have to make my own version of GenericGradientColoring from standard.ucl and put "render = false" in there.

recent by Frederik Slijkerman  ·  6 days ago at 12:49 pm
Eric B posted Mar 1 at 10:12 pm
While watching a screen capture video of someone working in UF6, the Render window shows a resolution of 118.110 with no units. What’s up with that?

recent by Eric B  ·  Mar 2 at 7:23 pm
physicist posted Feb 25 at 2:33 pm
Chaotic Attractors Tutorial

These, often called Strange Attractors, are iterative systems that don’t seem to go anywhere, but do (approximately) repeat. Unlike most of the formulas in UltraFractal (UF), the iterations don’t diverge to infinity or converge to a point.

A simple example is the Clifford Attractor, named after Clifford Pickover, as in Layer #1 of the upr file at th
recent by Eric B  ·  Mar 1 at 10:08 pm
JVYV posted Feb 27 at 1:20 pm
Hi All,

The previous month 3 new fractal parameter files in the collection.

You can find the whole existing collection at the cloud of Microsoft:!1034&authkey=!ALIZio6ZmgV1aAo&ithint=folder%2ctxt

Greetings from Belgium

Jan Vyvey

After reading Crystal Wizard's post of February 4 (, I got inspired, or perhaps carried away.

In the Tutorials and Tips section of the forum, I have put a tutorial on my new Chaotic Attractors coloring formula and a upr with 15 sample layers. As a teaser, renderings of two of the layers are below.

crystalwizard posted Feb 4 at 10:29 pm
I follow Pickover on twitter, and he made this suggestion today

"A simple formula produces strange and unpredictable forms ⁠— wispy, chaotic ghosts composed of 10 million points. "

here's the link he provided

and the formulas are incredibly simple

recent by physicist  ·  Feb 9 at 12:45 pm
Eric B posted Jan 18 at 9:50 pm
HEIFs are about 1/3rd the file size of PNGs, which are the smallest lossless files Ultra Fractal can write.

I’m converting the PNGs to HEIFs with another app but it doesn’t batch-process very well. It’d be sweet to have lossless HEIF right from UF. Even better if the files are saved with the .heif extension not .heic because Final Cut Pro and other apps don’t recogni
recent by Eric B  ·  Feb 3 at 8:07 pm
JVYV posted Feb 1 at 10:22 am
Hi All,

The previous month 5 new fractal parameter files in the collection.

You can find the whole existing collection at the cloud of Microsoft:!1034&authkey=!ALIZio6ZmgV1aAo&ithint=folder%2ctxt

Greetings from Belgium

Jan Vyvey

dannac posted Jan 30 at 12:38 pm
I added a hard drive to my computer ( D: )
and moved UF to that drive.

Tried copying over parameter files to D: drive and adjusting Pref locations, when I got the error message.

Apparently parameter or public paremeters cannot be relocated.
Tried to set back as was, but still get error message.

Any help advice appreciated.

recent by dannac  ·  Jan 30 at 6:16 pm
I'm trying to create a Droste effect animation of a single image inspired by M.C. Escher's print gallery version from a Leiden University study. Here is a sketch I made :
Thanks to Ultra Fractal and a Droste plugin from Jos Leys, I managed to create the desired effect :
As you can see I have a resolution problem on this last sketch due to the very high magnification (about 256 t
mrvelocipede posted Oct 10 '22 at 6:32 pm
This month I've been using Ultra Fractal to make illustrations based on drawing prompts generated by an AI. Kind of a frivolous exercise, but it has definitely sharpened up my techniques for using coloring formulas.

You can read about the prompts here:
and see the pictures I've made here:
recent by Eric B  ·  Jan 25 at 9:00 pm
physicist posted Jan 20 at 5:04 pm
Starting a day or two ago, the names of the files that I render from UF6 have -00019 added. That is, instead of xxx.jpg, the file is named xxx-00019.jpg.

What could be causing that? I've restarted my PC, same result.

recent by physicist  ·  Jan 20 at 9:09 pm
In arbitrary-precision arithmetics, the sign of the result of trigonometric and exponential functions is sometimes wrong.

Here's an excerpt of a formula printing some debug results:

complex m1 = exp(flip(#pi))
print("exp(i * #pi)=",m1)
float sin1=sin(#pi)
float cos1=cos(#pi)
print("cos(#pi)=",cos1, ", sin(#pi)=", sin1)
When I run this without additional precision, I get the following res
recent by AndreasH58  ·  Jan 20 at 4:05 pm
Matthew Friday posted Jan 17 at 6:08 pm
Dear UltraFractal folks,

I’m writing in the hopes that someone might assist me. I’m new to Ultra Fractal and am trying to replicate a very specific look for an art project I am developing. The closest example that I can find is one posted by Robert Töreki here:
In his caption he mentions that it is “A study of using t
recent by Matthew Friday  ·  Jan 20 at 12:39 pm
KathyR posted Jan 13 at 2:33 am
I found an interesting and visually pleasing phenomenon called Domain Coloring. Based on mathematical formulas, I don't know how closely it relates to fractals. I'm a big fan of rainbow coloring and when I stumbled upon these images I was mesmerized. Is there any way to make something like this in UF?
Here's a link:

recent by KathyR  ·  Jan 14 at 2:32 pm
Perturbation-style formulas depend on the #dz value remaining small enough
for fixed-point arithmetic. I managed to sabotage myself by setting a high
bailout value of 1e20 on this deep zoom with perturbation.

After reducing the bailout to 1e10 the formula worked beautifully.

(I wanted a high bailout because I was using smooth coloring)

Disturbation_bad {
recent by Frederik Slijkerman  ·  Jan 14 at 1:37 pm
physicist posted Dec 29 '22 at 2:14 am
Something curious is happening. Here's an exported image from UF. Looks right.

Here's what I get when rendered (normal anti-aliasing, forced linear drawing).

Noticeable differences, not subtle. Not solved by changing anti-aliasing parameters or precision. And if I render the same thing again, different results!

These are done with all 12 of my CPU's cores (6 real co
recent by Frederik Slijkerman  ·  Jan 8 at 6:55 pm
Lgsutekh posted Dec 29 '22 at 10:20 pm
I'm having difficulty while using the tutorial on animations. It seems that as I playback my initial animation, it zooms in horribly pixelized rather than a smooth image. Why is that?. I have been doing the tutorials up to this point and im stuck. CAn you give me a hand?

recent by Phillip  ·  Dec 31 '22 at 9:12 am
JVYV posted Dec 30 '22 at 10:23 am
Hi All,

This previous month one new fractal parameter file in the collection.

You can find the whole existing collection at the cloud of Microsoft:!1034&authkey=!ALIZio6ZmgV1aAo&ithint=folder%2ctxt

Greetings from Belgium

Jan Vyvey

recent by JVYV  ·  Dec 30 '22 at 12:57 pm
Urs posted Sep 30 '18 at 5:53 pm
Hi, after using only notebooks for over a decade, I am thinking about getting a (Windows) desktop PC. Not being much of a gamer, my primary concern with performance is deep-zooming the Mandelbrot set in UF. Does anybody have a suggestion for this, or even a benchmark computed on their machine?

I've read Frederik suggesting an i7. Is UF specifically tailored to Intel? I never read anything abo
recent by Eric B  ·  Dec 21 '22 at 10:24 pm
Eric B posted Nov 13 '22 at 6:22 pm
When rendering animations with motion blur, all is well for the first 90% of each frame. This is when UF is calculating the fractal and antialiasing. The four CPU cores are maxed out and the CPU is 0% idle, as shown below on Activity Monitor.

But then comes the final 10% of the frame, which is when motion blur is being calculated. UF suddenly gets a lot slower. The CPU is 70% idle.
recent by Phillip  ·  Dec 19 '22 at 11:31 am
physicist posted Nov 17 '22 at 1:09 am
Somehow, accidentally, I tagged an image as an animation, with one parameter having the animation indicator. As far as I know, I didn't do anything to do it, certainly not on purpose, and Animation was turned off as far as I know.
(1) How could I have done it, and how could I avoid it in the future?
(2) How should I undo it? I didn't see any way, so I edited the upr, taking out the code for
recent by Frederik Slijkerman  ·  Dec 6 '22 at 8:39 am
JVYV posted Dec 4 '22 at 9:38 am
Hi All,

This previous month no new fractal parameter files in the collection.

You can find the whole existing collection at the cloud of Microsoft:!1034&authkey=!ALIZio6ZmgV1aAo&ithint=folder%2ctxt

Greetings from Belgium

Jan Vyvey

dint posted Nov 10 '22 at 10:32 pm
I am going through the UltraFractal help

Combining fractals with Images.

And I get to this step:

"Locate the Color Trap plug-in parameter (currently set to Trap Shape Wrapper) and click the Browse button next to it. Navigate to the common.ulb file in the Public folder and select the Image Trap plug-in."

As soon as I click on Public->common.ulb

I get the follo
recent by Velvet--Glove  ·  Nov 13 '22 at 12:33 pm
dint posted Jul 7 '21 at 5:19 pm
I've created serveral animations where I create with outputing slides to png's.

Though I noticed sometimes if I make a zoom animation too fast... the slides look blurry. Are there any tips anyone can give as what is a good "time frame" so the zoom is not too fast ratio to time so it wont look blurry?

I hope that makes sense.

I can upload a few frames if it helps.

Thanks in adva
recent by dint  ·  Nov 10 '22 at 10:33 pm
Load more
All posts under this topic will be deleted ?
With selected deselect topics
Pending draft ... Click to resume editing
Discard draft