Collision Box Generator - Game Colliders for Unreal, Unity and Godot

Collision Box Generator wraps any mesh in game-ready colliders with one click. Select a model, press Generate Colliders, and the addon fits a small set of boxes, spheres, capsules or convex hulls that follow its shape, named exactly the way your game engine expects. No more hand-placing UCX cubes for every prop.

The solver voxelizes the model, splits it into parts and fits the best simple shape to each part, then tightens every collider against the real surface. A typical prop gets six to twenty colliders in about a second, covering more than ninety percent of the model while barely sticking out.

Features

• One click: select one or many meshes and press Generate Colliders
• Five shape modes: Auto (picks the best shape per part), Box, Sphere, Capsule and Convex
• Low, Medium and High detail, plus an exact collider limit, tightness, seed and hull vertex limit
• Unreal: UCX_, UBX_, USP_ and UCP_ names, exported with the model as FBX
• Unity: FBX plus an importer script that turns colliders into real Box, Sphere, Capsule and Mesh colliders
• Godot: -colonly names exported as GLB
• Any other engine: COL_ names plus JSON with the exact position, rotation and size of every collider
• Result card with collider count, coverage and how far colliders stick out; Select, Hide and Clear in one click
• Colliders are parented to the model, drawn as colored wireframes and never show up in renders
• Pure Python and numpy, no external libraries or downloads

How it works

• Open the Collision tab in the 3D viewport sidebar
• Pick your engine, a shape and a detail level from the picture tiles
• Press Generate Colliders, then Export

Requires Blender 4.2 or newer. Tested on Blender 4.2, 4.5 and 5.2 LTS.