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ProBuilder is a 3D modeling plugin for Unity.

This readme is intended as a brief introduction for developers interested in working with the API.

See the Manual for a user guide, or the Scripting Reference for API documentation.

## Development

ProBuilder is a developed as a package and distributed with Package Manager.

The simplest way to get started working with source is to clone the repository into your Packages directory.

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

## API

There are 3 major namespaces.

Namespace Function
UnityEngine.ProBuilder Mesh types and functions to compile meshes to Unity compatible assets.
UnityEngine.ProBuilder.MeshOperations Mesh editing.
UnityEditor.ProBuilder Editor integration.

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();

## Contributing

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.

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