Auto Sable Physics
by ZXTangYuan
Auto Sable Physics turns unsupported blocks, trees and small structures into Sable physics objects, and converts them back to normal blocks once they settle or are pinned.
What it does
Changes are handled event by event: breaking, placing, explosions, pistons, falling blocks and fluid updates trigger the checks, so the whole world is never scanned each tick. When a structure loses support, the connected block group is evaluated as one component and turned into a movable physics object, letting a larger unsupported section fall as a single piece instead of many separate fragments.
Cutting a tree makes its trunk a physical object once it loses support, and the connected logs bring nearby leaves along. Foliage, vines, cocoa pods and other blocks tied to trees follow their own rules so the tree moves more convincingly. Small single blocks use vanilla-style falling behavior instead of creating a full physics object, which reduces unnecessary tiny objects and helps performance in common cases.
The mod requires Sable and is published for NeoForge on 1.21.1 only. The server and every player need the mod installed. The code is distributed under a custom license that is not open source, and public links exist for the source code.
Key features
Automatic block physics
Unsupported blocks, trees and small structures are converted into Sable physics objects when their support is removed.
Pin and restore
A physics object can be pinned so it is not restored automatically, and it can be restored back to normal blocks by hand.
Sable Hammer tool
The Sable Hammer tool switches its mode with a sneak-use action or through commands, and a claw face and hammer face are available.
Tree-only configuration
A configuration option limits processing to tree-related physics, which suits modpacks that only want falling trees and no other structures.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
How it compares
Sable Physics Tree is the closest alternative for trees, is released under the MIT License and runs on client and server for 1.21.1 on NeoForge. Auto Sable Physics covers more than trees and uses the same client and server environment, but its custom license does not make it open source. Ship Trails for Sable is client-side only, so servers run without it, and is released under All rights reserved for 1.21.1.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Auto Sable Physics | NeoForge | 1.21.1 | Client and server | 2026-05-24 |
| Sable Physics Tree | NeoForge | 1.21.1 | Client and server | 2026-09-06 |
| Ship Trails for Sable | NeoForge | 1.21.1 | Client-side only | 2026-05-21 |
Questions
Does Auto Sable Physics need Sable?
Does the server need the mod?
Can the mod be limited to falling trees?
In the catalog
Auto Sable Physics is one of 8,499 Technology mods on ModsFinder, and one of 3,557 Technology mods for NeoForge. 32,366 mods support Minecraft 1.21.1.
Similar mods
What the author says
Auto Sable Physics is a Minecraft physics automation mod based on Sable. It makes unsupported blocks, trees, and small structures behave more physically while trying to keep normal building, exploration, and modpack gameplay stable. Instead of scanning the entire world every tick, the mod reacts to actual block…
Official listing
- Modrinth page
- modrinth.com/mod/auto-sable-physics
- Owner
- ZXTangYuan
- Published
- 2026-05-10
- Updated on Modrinth
- 2026-05-24
- Facts verified
- 2026-10-15