pb_Stl：Unity的STL importexport，同时支持ASCII和二进制

# pb_Stl An STL importer/exporter for Unity. **pb_Stl** is the exporter used in ProBuilder to save [STL](http://paulbourke.net/dataformats/stl/) model files.  ## Install 1. In the `Packages` directory of your Unity project, `git clone https://github.com/karl-/pb_Stl.git co.parabox.stl` or 1. Open `Packages/manifest.json` 1. Add `"co.parabox.stl":"https://github.com/karl-/pb_Stl.git"` to the `"dependencies"` list ## Quick Start 1. Select a `GameObject` in the Scene View with a `MeshFilter` and valid `Mesh`. 1. In the file menu, `Edit > Export > STL (Ascii)`. 1. View your shiny new STL file. ## Features - Export and import Binary & ASCII STL files in editor or at runtime. - Custom AssetPostProcessor automatically creates usable prefabs from any STL imported to Unity. - Option to convert from left to right handed coordinates (on by default, as per STL spec). - Automatic merging of multiple selected meshes, including relative transformations. - Import models with vertex counts larger than Unity max by automatically splitting into multiple meshes. ## Planned Improvements - Export window with additional options: - Swap model axis on import/export. - Export as multiple objects or merge (currently always merges). - Generate normals on import (with smoothing or no). ## Troubleshooting #### Model is sideways / horizontal / rotated Unity's coordinate system is left handed, with Y axis as the vertical. Other 3d modeling programs may have different coordinate systems or axis assignments. **pb_Stl** exports right handed coordinates by default, but can be modified to retain left handed coordinates. Support for swapping axes is planned. ## Contributing If you would like to submit improvements please include NUnit tests for your changes (and make sure they don't break any existing tests). ## License It's MIT.