GLTFUtility

GLTFUtility

Allows you to import and export glTF files during runtime and in editor. glTF is a new opensource 3d model transmission format which supports everything you'll ever need from a format in Unity. Read more about glTF here

What makes GLTFUtility different?

Focusing on simplicity and ease of use, GLTFUtility aims to be an import-and-forget solution, keeping consistency with built-in functionality.

Installation

Using Unity Package Manager (Help)

1. "com.siccity.gltfutility": "https://github.com/siccity/gltfutility.git"

Using git

1. Get Newtonsoft.JSON from one of these sources
   • Official upm package: "com.unity.nuget.newtonsoft-json": "2.0.0-preview",
   • Unofficial git repo: https://github.com/jilleJr/Newtonsoft.Json-for-Unity
2. Clone GLTFUtility by itself or as a submodule
   • Clone into your assets folder git clone git@github.com:Siccity/GLTFUtility.git
   • Add repo as submodule git submodule add git@github.com:Siccity/GLTFUtility.git Assets/Submodules/GLTFUtility

Manual download

1. Get Newtonsoft.JSON from the asset store
2. Download GLTFUtility-master.zip and extract to your project assets

Important notice

Features

System

• Editor import
• Editor export
• Runtime import API
• Runtime export API
• GLTF format
• GLB format
• Multithreading
• URP #75
• HDRP #73
• LWRP

Spec

• Static mesh (with submeshes)
• UVs (up to 8 channels)
• Normals
• Tangents
• Vertex colors
• Materials (metallic/specular, opaque/mask/blend)
• Textures (embedded/external)
• Remote textures (during async only)
• Rig
• Avatar/Mask #70
• Animations (multiple)
• Morph targets (with experimental names)
• Cameras

Extensions

• KHR_texture_transform (partial support)
• KHR_materials_pbrSpecularGlossiness
• KHR_lights_punctual #25
• KHR_draco_mesh_compression #27 WARNING: Said to cause issues on WebGL.
• KHR_mesh_quantization

Known issues

• ArgumentNullException: Value cannot be null in build but not in editor.
  • This is most likely due to shaders being stripped from the build. To fix this, add the GLTFUtility shaders to the Always Included Shaders list in Graphic Settings.
• Draco compression does not work on iOS and UWP
  • More info on #133

Runtime import API

// Single thread
using Siccity.GLTFUtility;

void ImportGLTF(string filepath) {
   GameObject result = Importer.LoadFromFile(filepath);
}

// Multithreaded
using Siccity.GLTFUtility;

void ImportGLTFAsync(string filepath) {
   Importer.ImportGLTFAsync(filepath, new ImportSettings(), OnFinishAsync);
}

void OnFinishAsync(GameObject result, AnimationClip[] animations) {
   Debug.Log("Finished importing " + result.name);
}

Important shader note

To ensure that Unity includes the GLTFUtility shaders in builds, you must add these shaders to the 'Always Included Shaders' list.

1. Open Edit -> Project Settings
2. Open Graphics
3. Scroll to Always Included Shaders
4. Under Size, increase the value by 4 and hit Enter.
5. In the Project panel, navigate to Packages/GLTFUtility/Materials/Built-in.
6. In this directory are 4 .shader files.
7. Drag and drop each of the 4 files into one of the 4 newly created rows in Always Included Shaders.