Comments

JasonS 19th May 2020

like concentric circles with distance between each circle shrinking so that the area between any two adjacent circles is the same. And then put those concentric circles on a square grid. Not sure if this is correct, just a thought
JasonS 19th May 2020

I think it's a moire pattern
LBPHacker 19th May 2020

Here, have a reproduction of this in Shadertoy: https://www.shadertoy.com/view/tdSfW1 - This doesn't explain it (that's supposed to be the task of my previous comments), it's just cool because it shows the phenomenon in isolation, outside of TPT.
LBPHacker 19th May 2020

And of course the "frequency" of .tmp (i.e. how quickly layers of EXOT go from bright to dark and back) is a function of distance from origo exactly because EXOT is added with the same rate throughout the simulation, but new layers are distributed over a larger area than previous ones (actually converges to some constant multiple of the distance from origo, much like how the circumference of a circle is a constant multiple of its radius) and are thus "narrower".
LBPHacker 19th May 2020

I don't think they're Moire patterns; I can't see how their definition (involving lines) would apply here. This looks more to be more a result of sampling a high-frequency function (the .tmp of EXOT as a function of distance from origo) with an inadequate rate (every pixel or so), which yields something known as "folding" in the field of digital signal processing. I know it may be a bit of a stretch to post this, but https://en.wikipedia.org/wiki/Nyquist_frequency
SpeedCat998 19th May 2020

odd (comment too short)
Squaesh 19th May 2020

They're radial Moire patterns
DAEKJAY64 19th May 2020

boi thats a hard one
Aleneration 18th May 2020

In TPT source code, file EXOT.cpp, function graphics(): *colr = (sin(frequency*c + 4)......
Planet 18th May 2020

@INFINITY-BOI you said "im was thinking", that confused me

The Powder Toy

Why are patterns formed? by SWORARS

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