Dynamic Falling Tree
Realistic tree falling physics for Minecraft 1.21.1 (Fabric). When you chop a tree, it falls over using rigid-body physics instead of instantly disappearing.
What It Does
- Chopping the base log of a tree causes the entire tree to tip over and fall using real physics simulation.
- Blocks are removed flicker-free via a
BARRIER -> AIRsequence in the same server tick. - Trees spawn impact smoke particles when they hit the ground.
- Leaves break naturally after the tree settles, with vanilla particle effects.
- Works on rootless/floating trees as well as grounded ones.
Requirements
| Dependency | Version |
|---|---|
| Minecraft | 1.21.1 |
| Fabric Loader | >= 0.16.9 |
| Fabric API | >= 0.110.0+1.21.1 |
| Sable | >= 1.2.2 |
Installation
- Install Fabric Loader for 1.21.1.
- Download Sable and place it in your
mods/folder. - Download this mod's JAR and place it in
mods/. - Launch and chop a tree.
Configuration
Config file auto-generates at .minecraft/config/treephysics.properties:
rootless_tree_detection=true
requires_axe=false
prevent_interacting_with_trees=true
rooted_dirt_generation=true
impulse_torque=2.0
impulse_force=1.5
| Option | Description | Default |
|---|---|---|
rootless_tree_detection |
Allow floating trees to fall. | true |
requires_axe |
Only trigger physics when holding an axe. | false |
prevent_interacting_with_trees |
Block placing/using items on falling trees. | true |
rooted_dirt_generation |
Generate rooted dirt under naturally spawned trees. | true |
impulse_torque |
Rotational force applied to falling trees. | 2.0 |
impulse_force |
Linear push force applied to falling trees. | 1.5 |
How It Works
- Detection: Breaking a log triggers a flood-fill search for connected logs, leaves, and attached blocks.
- Validation: The detected structure is validated as a tree (must have a root on dirt or have leaves if rootless mode is on).
- Assembly: Valid tree blocks are converted into a Sable
ServerSubLevel— a physics-backed block container with independent collision and transform. - Flicker Fix: Original world blocks are replaced with
BARRIER, then immediatelyAIR, preventing any visual flicker. - Impulse: A directional force and torque are applied based on the player's position, causing the tree to tip over.
- Impact & Decay: While falling, the server tracks velocity. Ground contact spawns smoke particles. After settling, leaves break naturally.
Technical Details
- Built on the Sable physics engine using SubLevel rigid-body simulation.
- All physics runs server-side and syncs to clients over the network.
- Singleplayer and multiplayer compatible.
- Licensed under MIT.
