RuntimeCSG
Non-destructive CSG brush modeling for Unity. Build geometry with boolean operations in real-time.
Real-time face hover, operation-colored wireframes, and click-to-select in the Unity editor.
Three Operations, Infinite Shapes
Combine simple brushes into complex geometry with real-time boolean operations.
Union
A + B
Merge brushes together. Add geometry to build up your scene.
Subtract
A − B
Carve and cut. Remove geometry to create holes, doorways, windows.
Intersect
A ∩ B
Keep only the overlap. Create complex shapes from simple primitives.
Built for the Unity Editor
Scene overlay toolbar, keyboard shortcuts, and visual feedback so you never leave the viewport.
- Mode toggle between Add and Subtract
- One-key brush creation (Shift+B/W/C/S)
- Per-brush wireframe overlays with operation coloring
- Face drag handles for direct manipulation
- Inspector buttons for shape and operation changes
Features
Per-Brush CSG Engine
Chisel-style algorithm processes each brush independently. Fragments are split and evaluated against the full boolean chain.
Chunk System
World-space grid chunking with dirty tracking. Only affected chunks rebuild. Time-sliced across frames for smooth performance.
Runtime Ready
Not editor-only. Generate and modify CSG geometry at runtime for procedural levels and player-built worlds.
Double Precision Math
Plane math uses doubles internally. No precision collapse at world-scale distances. Float only at mesh output.
Coplanar Handling
Later-brush-wins tiebreaker prevents z-fighting. No duplicate surfaces or flickering between overlapping faces.
Auto Colliders
Each chunk generates a MeshCollider automatically. Physics-ready geometry with zero extra setup.
Undo Support
Full Unity Undo integration. Every brush add, shape change, and face drag is undoable.
UPM Package
Install from git URL via Package Manager. Clean runtime/editor assembly split. No dependencies.
MIT Licensed
Fully open source. Use in commercial projects, modify, redistribute. No attribution required.
Brush Primitives
Start with built-in shapes. Combine them to build anything.
How It Works
Chisel-style per-brush CSG in four steps.
Split
Each brush's polygons are split against planes of all overlapping brushes, creating convex fragments.
Categorize
Each fragment is classified as inside, outside, or coplanar relative to every other brush.
Evaluate
The boolean chain is evaluated for both sides of each fragment to determine visibility.
Build Mesh
Visible fragments are clipped to chunk bounds and built into Unity meshes with colliders.
Quick Start
CSG at runtime in a few lines.