Repeatdecor-cl v1.03
Hi everyone,

1.03 of this app is now live, and I've confirmed it at least launches this time before putting out this news post.

Please give it a try on your machines. On my 3090 is seems to be a bit faster than the CUDA version in my limited testing. But YMMV.
1 Aug 2025, 14:21:55 UTC · Discuss

Repeatdecor-cl v1.02
Hi everyone,

We've released a new version of the OpenCL variant of this app with vastly improved performance.
It also resolves the platform detection issue mentioned by Ahorek on the previous news thread.

Please give it a try on your machines and let us know how it looks! Feedback welcome as we work through this beta phase.
31 Jul 2025, 16:15:11 UTC · Discuss

Repeating Decoration Seeds opencl app
Hi everyone,

The OpenCL version of this app has been launched as a beta app.

AMD/Intel users can contribute with their GPUs for this app now.

Please let us know if you encounter any issues. We'll be monitoring and pull it out of beta once it seems stable.
29 Jul 2025, 16:17:43 UTC · Discuss

Repeating Decoration Seeds v1
Hi everyone,

We've had a new CUDA app in beta for around the last 24 hrs and it seems stable enough to push it out of beta at this time.

Here's the technical explanation from the lead developer of the app, MC "PseudoGravity":

While each Minecraft world possesses a single world seed, every 16x16 chunk within the world possesses its own derived seed, known as a decoration seed. Each chunk’s decoration seed is determined by the unique combination of world seed and chunk location. This decoration seed in turn guides the generation of features such as trees, ores, and portions of structures.
The decoration seed formula is as follows:
decorationSeed = (AX + BZ) ^ worldSeed
Here, A and B are 64-bit pseudorandom odd numbers generated from the world seed and are therefore the same throughout the world. Variables X and Z are the coordinates of the chunk and are always multiples of 16. This formula is designed to ensure that each chunk within the world has a different decoration seed and thus different trees and related features.
However….
Taking a closer look at this equation reveals that the portion AX+BZ is the only part that depends on the chunk coordinates. If this subexpression produces the same value at multiple locations within the same world, then those chunks will have the same decoration seed. Specifically, if NA=MB mod 2**64 for some small integers N and M, then
A(X+N) + B(Z-M) = AX+BZ mod 2**64
and we see that the decorations seeds repeat along a line formed by (N,-M). When N and M are very small, interesting effects occur, as chunks form stripes along which identical trees and related features repeat endlessly.
Participants in this GPU-based BOINC project will exhaustively comb through all 2**64 Minecraft world seeds to uncover those in which the pseudorandom values A and B produce repeating patterns. Preliminary searches have discovered a few diagonally-repeating worlds, including several which repeat every single chunk diagonally. This full-scale search will produce a complete list of all Minecraft worlds in which decoration seeds repeat within a distance of 8 chunks, including non-45-degree angles.

27 Jul 2025, 3:42:13 UTC · Discuss

More xoroshigo2 configs
Hi all,

I know it has been awhile, but the developer behind the xoroshigo app has created additional configurations to run xoroshigo on to hopefully get the search going in the right direction.

The new work is generating now, and I'm cancelling most of the 11 million or so tasks that have not yet been sent.

I made sure to exclude those which had one task complete with the validating task remaining, as to not affect partially completed workunits.
21 May 2025, 0:44:06 UTC · Discuss

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