Manifold
Open-source C++ library for fast, robust 3D mesh boolean (CSG) operations.
Liked as the fast new geometry backend in OpenSCAD, far quicker than the old CGAL renderer,12 and as a CSG meshing library integrated into Godot and Blender.34 No complaints are mentioned; it suits OpenSCAD users and developers who need CSG in C++ or game engines.567
Why people recommend it
Speed · 2
Much faster than CGAL, with trivial operations reported two orders of magnitude faster.
“The Manifold renderer is so much faster than the old CGAL”
“Trivial operations are two orders of magnitude faster and complex ones every faster.”
Engine integration · 2
Used in Godot Engine and available as a method in Blender.
“I spent a lot of time making elalish/manifold work in Godot Engine and it is now a method in Blender too.”
“If you want reification/meshing I recommend [1] which is what Godot uses.”
CSG meshing · 1
Recommended for reification and meshing of CSG models.
“If you want reification/meshing I recommend [1] which is what Godot uses.”
Caveats and dissent
No one in these comments warned against it.
Who recommends it in their own words
Threads where it came up
- OpenSCAD the Programmers Solid 3D CAD Modeller 1 mention
- Show HN: Formally verified 3D CSG: Trust 93 lines spec, not 1000 lines AI code 1 mention
- Unified Controllable and Faithful Text-to-CAD Generation with LLMs 1 mention
- Java 26 is here, and with it a solid foundation for the future 1 mention
- OpenSCAD is kinda neat 1 mention
Also written as manifold. Data: manifold.json. Quotes are verbatim; the verdict and theme labels are written by a model from these comments, and every clause links to its sources.
All comments 5
“The Manifold renderer is so much faster than the old CGAL”
“I spent a lot of time making elalish/manifold work in Godot Engine and it is now a method in Blender too.”
“If you want reification/meshing I recommend [1] which is what Godot uses.”
“The manifold project provides true delegation[1] for Java.”
“Trivial operations are two orders of magnitude faster and complex ones every faster.”