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Chisel is a Unity extension for rapid, iterative, non-destructive level editing. Block out a level with brushes, carve it with subtractive shapes, refine it with generators and texture it with hotspots and decals — every operation stays live, so nothing is baked until you want it to be.
Every feature is documented in the wiki.
| Hotspot mapping UVs come from the best-matching tile of a layout. Layout editor included. |
Decals Project a material over or in place of surfaces. Omni-directional, skewed, with fade distances. |
Trim decals Decals that wrap the edge between two surfaces and follow it as brushes change. |
| Vertex painting Paint directly onto CSG surfaces. |
Double-sided surfaces A material can draw its surfaces from behind too. |
Normal smoothing Smooth shading across CSG surfaces. |
| Real-time CSG Exact geometry, generated in real time, without cracks where shapes meet. |
Add, remove, intersect Fluid, interactive, non-destructive CSG operations. |
Generators Higher-level shapes keep their context: stairs stay editable as stairs. |
| Hierarchical CSG Grouped brushes and generators act as one whole. |
Brush contents Solid, glass or water. Faces stay where different contents meet. |
Subtractive workflow Start from solid space and carve rooms out of it. |
| Prefabs Drop a window onto a wall and its hole comes with it. |
2D shapes Draw on CSG surfaces, bend lines into curves, extrude. |
Forgiving brushes Brushes stay visible and editable while their shape is invalid. |
| Snapping Snap the pivot or bounds of what you move to grid lines. |
Rotatable grid Move and rotate the grid to work at any angle. |
Debug visualizations See hidden, shadow-only, collider and CSG-discarded surfaces. |
Ordinary Unity meshes and colliders that work with light-mapping, occlusion culling and navigation meshes — split into a mesh per material and into spatial chunks.
Requires Unity 6.6 or newer and the Universal Render Pipeline (URP).
- Open Window › Package Manager
- Click + and choose Install package from git URL…
- Paste the URL below and press Enter.
https://github.com/RadicalCSG/com.chisel.git
The first start-up takes a while: Burst compiles a lot of code. This only happens once.
Read the getting started guide →
| Extension | Repository |
|---|---|
| Source Engine 2006 map importer | Henry00IS/Chisel.Import.Source |
| ↳ Decals on models that aren't Chisel geometry | Henry00IS/Chisel.Decals |
| ↳ VPK import support for the importer | nukeandbeans/com.chisel.import.source.vpktools |
| Quake 1 importer | Quixotic7/Chisel.Import.Quake1 |
The core algorithm is explained in the GDC 2020 talk Geometry in Milliseconds: Real-Time Constructive Solid Geometry.
- Questions, showcases and dev chat: join the Discord server
- Want to contribute? Start with a good first issue
Found a case where Chisel fails? Open an issue — a scene that reproduces it helps a lot.
Chisel is released under the MIT license.