Octane Scatter Issue (Repeating Line Pattern)

[lukesky345]

Hey Community hope you are all doing well so as the title suggests I'm having an issue with octanes scattering tool where it seems like it only scatters in perfect lines i have seen some post from pior years but i felt since this issue is still prevalent in the year 2024 and none of those old post were of much help we need an updated post on this issue now I don't know if this is because I'm doing something too ambitious for octane to handle or if it's the large plane that I'm trying to scatter on but I've been having this issue for the last handful of months where even when it's on Surface it will still scatter in these perfect lines so before some of you guys suggest these things let me tell you what I have tried mograph effecters such as random, plain, Shader all of which would cause the objects that are being scattered to elevate off object they are being scattered on to. Below you'll find some screenshots and a RAR file with the project in it

[frankmci]

I've run into this before. It seems to be an artifact of the combination of the uniformity of the scatter surface tesselation in conjunction with the number of scatter child objects on it. You can think of it like harmonic resonance. Delete one of your 89 scatter objects or add one more object, and the distribution works as expected. This is independent of the Scatter Count, the Scatter Random Seed or the Randomization mode, so I think it has something to do with the underlying distribution function.

I should mention that a single digit change in Scatter child object numbers may not always do the trick. There can be multiple harmonics involved, and they can be different for every piece of geometry. You may find that adding or subtracting a single object produces a different harmonic. The more uniform XY divisions of the Scatter Surface and the more Scatter child objects involved, the more potential harmonics it seems to create. The upside is with the more child objects you're using, the more options you've got that avoid the resonance.

[bepeg4d]

Or you can just switch the Distribution type from "Surface" to "Poisson":

ciao,
Beppe

[frankmci]

Or you can just switch the Distribution type from "Surface" to "Poisson":

[jayroth2020]

Beppe for the win!

[bepeg4d]

Hi Frank,
nice to see I can still surprise you sometimes

Hi Jay,
thanks mate

ciao,
Beppe

[pxlntwrk]

Or you can just switch the Distribution type from "Surface" to "Poisson":

IMG_3224.jpeg

ciao,
Beppe

obviously, thanks