physicist posted 4 days ago at 4:33 pm
I saw a painting by Bridget Riley (see and wondered what I could make that would be similar. It’s clearly a case of adding waves to horizontal lines.

I wanted to start with a pixel formula and a coloring formula that would just reproduce the gradient horizontally and then apply a
recent by dannac  ·  2 days ago at 2:27 pm
physicist posted 3 days ago at 1:54 am
The Waves transform can be used to generate interesting patterns or textures. The left third of the strip is the image from Group 1 of the upr below; it is the difference of two layers. The middle third is from Group 2, which is the difference of three layers. The right third is the difference of the two Groups. (I made the strip from three separate images using the FastStone Image Viewer.)

recent by Velvet--Glove  ·  2 days ago at 1:15 pm
physicist posted 7 days ago at 1:52 pm
The ResultIndex function of a GradientColoring formula returns a value for #index, an index into the gradient. The #index has useful values from 0 to 1. If #index is outside [0,1], 0 is used.

If Repeat Gradient is checked, positive values greater than one are reduced to [0,1]. For example, 3.7 becomes 0.7, which is in range. However, negative values of #index are still replaced by 0.

JVYV posted May 31 at 11:46 am
Hi All,

In the month April 1 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

Frederik Slijkerman posted May 31 at 10:35 am
Many of you may have noticed that it was impossible to log in to the forum during the past week due to issues at the hosting provider responsible for hosting the Ultra Fractal web site. I'm very pleased to say that this has been resolved and the forum is back up again! My apologies for the outage.

physicist posted May 10 at 10:03 pm
I recently noticed that the ampersand character & seems to be ignored in the caption of a parameter, although it shows up properly in the caption or text of a heading.

Try something like

caption = "this & that"
float param p
caption = "this & that"
When the formula is invoked, the & shows up in the heading, but no
recent by physicist  ·  May 17 at 12:03 pm
I'm moving to a new computer. I've installed UF6.05 successfully. Where on my old computer are my Preferences saved? I'd like to just copy them over to the new computer, with a little editing.

The usual place would be
C:\MyName\Appdata\Roaming\Ultra Fractal 6
but I don't see anything useful there.

recent by IssacAcker  ·  May 17 at 9:32 am
JVYV posted Dec 27 '17 at 12:49 pm
Hi Frederik,

When using UF6 (and the previous versions also) my computers CPU (Intel I5 with 4 cores) is working at 100 % while my GPU (NVIDIA GeForce GTX670) is doing ... right ... nothing at all.

There are softwares - I'm refering to "SETI@home" (*) - that are doing math calculations and are using not only the CPU's in your PC but also the GPU as you can see on the diagram below and th
recent by Frederik Slijkerman  ·  May 16 at 4:37 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
recent by Bolos  ·  May 16 at 12:34 pm
I've been a longtime user of Photoshop and other graphics applications, but not spent much time creating fractals. I've looked at hundreds of fractals and there is one style in particular I really like and would be happy to create in a variety of ways. I think it's referred to as chaotic bundle or chaotic thread, but I may be mistaken regarding this. What I need help with is the steps in UF to cr
recent by bertramegon1  ·  May 16 at 10:22 am
I have an older INtel i7 computer I don't use anymore because I replaced it with newer one. I would like to use the old I7 computer as a server. To my understanding. THere is a way to make the older computer into a Server. Reading the instructions I am trying to understand some things.

Does having the server mean that all computation runs on the server all computers running server or is
KathyR posted Apr 30 at 3:58 am
Would someone be kind enough to take a look inside the sp3 formula folder. All I'm seeing is a bunch of gobbledygook and the formula I'm looking for is called Cubic Parameterspace 3. I'm trying to upload a parameter set of Ingvar's on DA and it's not working. I have updated all my formulas.
Here is what I see inside that folder:

Ingvar said it is the very first formula i
recent by Velvet--Glove  ·  May 6 at 3:19 pm
Spizzi posted Apr 27 at 9:41 pm
Hi all,
Playing with the new formula Burning Mandala of Phillip...

burningSpiral {
recent by JVYV  ·  Apr 28 at 9:12 am
Phillip posted Apr 5 at 8:55 am

I have been working with a formula for a while, which I have been calling Mandalamandelbrot and Mandaljulia, because it creates nice patters with circular symmetries depending on the location and parameters used. Here are a few examples:
recent by Phillip  ·  Apr 26 at 8:41 am
I've tried both with the client on my TR Pro and the server on the 10/20 core i7-6950x and the other way around; regardless of which direction it's going, only one core on the machine set up as the server is used. (tested that just in case it was deciding offload wasn't worthwhile). I checked affinity and it was set to all cores for the server process and the client was set to 20 cores on the
recent by FractalGnome  ·  Apr 23 at 3:54 pm
physicist posted Apr 3 at 1:54 pm
When writing formulas, I frequently make errors that the compiler finds. The compiler then moves the insertion mark to the location of the first error that it finds. The insertion mark is somewhere on the current page, but it's not easy to see.

I'd like an option in Preferences to make the insertion mark more visible. Perhaps larger, or a different shape, or a different color.

recent by Frederik Slijkerman  ·  Apr 11 at 5:14 pm
physicist posted Apr 4 at 2:53 pm
A tiny thing, but...

In writing programs, what I really miss from my days writing in C, is ++, being able to write n++ instead of n = n + 1. Even better if it's BigArray[LongIndex]++.

recent by Frederik Slijkerman  ·  Apr 11 at 5:11 pm
physicist posted Sep 22 '22 at 7:54 pm
The built-in functions include round, floor, ceil, and trunc. Trunc rounds towards zero. For floats, the behavior of trunc is equivalent to the following:

float func trunc(float x)
if x >= 0
return floor(x)
return ceil(x)
There is no equivalent function with < instead of >. In mathematics, I haven't even found a name for this. The best name that I cou
recent by physicist  ·  Apr 5 at 12:33 pm
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  ·  Apr 1 at 5:15 pm
I am rendering some simple fractals, but it seems to take more time than it should. I find that the 4 Efficiency cores are running 100%, while the other 4 Performance cores are all idle. Interestingly, this doesn't happen when I am previewing the fractal. The rendering speed would be greatly increased if this can be fixed.
By the way, I am using a MacBook Air with an M1 chip.

recent by Eric B  ·  Apr 1 at 5:13 pm

I was just playing with a fractal and noticed that there should be a very nice way of coloring my fractal if I juuuuust got the gradient offset and color density right. But I need to adjust them one by one, going back and forth. I think for these two it would make sense to have a 2D explorer - like we do for complex variables - where we can adjust color density on the x-axis and gradi
recent by Frederik Slijkerman  ·  Mar 31 at 9:33 am
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  ·  Mar 28 at 2:00 am
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  ·  Mar 18 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
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