• About
• Setup
• API Overview
• License
• Third Party Licenses
• Contributing

ProBuilder is a 3D modeling plugin for Unity.

This readme provides a brief introduction for developers interested in working with the API. For more information, the following guides are available:

• See the Manual for information about working with ProBuilder in the Unity Editor.
• See the Scripting Reference for API documentation.

Working code samples are also available from the package repository under the Samples~ subfolder, or from the Package Manager you can import them directly into your Unity project.

Unity provides ProBuilder as a package, distributed with the Package Manager.

To start working with ProBuilder source, clone the repository into your Packages directory.

~/Desktop/MyProject$ cd Packages/
~/Desktop/MyProject/Packages$ git clone https://github.com/Unity-Technologies/com.unity.probuilder

Then you can install the cloned package directly in the Package Manager using the "local" method. For more information on installing local packages in the Package Manager, see the Package Manager documentation.

There are 3 major namespaces.

Mesh data is stored in a component (ProBuilderMesh) and compiled to a UnityEngine.Mesh (referred to as UMesh from here on) as necessary.

ProBuilderMesh retains the following mesh information:

• Positions
• UVs
• Faces
  • Triangles
  • Material
  • Smoothing group
  • Auto/Manual UVs*
• Tangent (if user set)
• UV3/4 (if user set)
• Colors
• Shared vertices (also referred to as "common vertices")

Normals, tangents, collisions, and UVs are calculated as necessary.

*ProBuilder can automatically UV unwrap triangles on a per-face basis. Face has a toggle to enable or disable this feature (users are free to unwrap faces by manually as well).

Modifying a ProBuilder mesh is a bit different from a Unity mesh. Instead of working with the MeshFilter.sharedMesh you'll instead be operating on the ProBuilder representation of the mesh: ProBuilderMesh.

A typical workflow looks like this:

// Create a new cube primitive
var mesh = ShapeGenerator.CreateShape(ShapeType.Cube);

// Extrude the first available face along it's normal direction by 1 meter.
mesh.Extrude(new Face[] { mesh.faces.First() }, ExtrudeMethod.FaceNormal, 1f);

// Apply the changes back to the `MeshFilter.sharedMesh`.
// 1. ToMesh cleans the UnityEngine.Mesh and assigns vertices and sub-meshes.
// 2. Refresh rebuilds generated mesh data, ie UVs, Tangents, Normals, etc.
// 3. (Optional, Editor only) Optimize merges coincident vertices, and rebuilds lightmap UVs.
mesh.ToMesh();
mesh.Refresh();
mesh.Optimize();

Unity Companion License

Third Party Licenses

All contributions are subject to the Unity Contribution Agreement(UCA).

By making a pull request, you are confirming agreement to the terms and conditions of the UCA, including that your Contributions are your original creation and that you have complete right and authority to make your Contributions.

Pull Requests

Please include an entry to the changelog for any PR, along with a Fogbugz ticket number if applicable.

New logs should be placed under the ## [Unreleased] header at the top of the changelog. See Contributing for more details.