GLTF

What is glTF?

glTF(GL Transmission Format) is a specification released by khronos that enables efficient transmission and loading of 3D scenes. It is a JPEG format in the 3D field, covering traditional model formats such as FBX and OBJ . It basically supports all features in 3D scenes, and its plugin mechanism also allows users to flexibly customize and implement the desired functions. GlTF is currently the preferred 3D scene transmission format recommended by Orillusion , and Orillusion provides excellent support for the core functions and plugins of glTF .

Load glTF

Using Engine3D.res.loadGltf to load the gltf model, this method optimizes the gltf/glb file and allows for direct addition of objects:

let scene = new Scene3D();
// Load gltf file
let data = await Engine3D.res.loadGltf('sample.gltf');
// Add to scene
scene.addChild(data);

Plugin support

Currently, the following glTF plugins are supported. If the glTF file contains the corresponding plugins, the corresponding functions will be automatically loaded:

Plugins	Features
KHRdracomesh_compression	Support Draco compression, which can effectively save model volume
KHRlightspunctual	Supports multiple light source combinations, which will be resolved into engine light sources. Please refer to the Lighting Tutorial
KHRmaterialspbrSpecularGlossiness	Supports the 'PBR' highlight glossiness workflow
KHRmaterialsunlit	Supports Unlit materials
KHRmaterialsvariants	Allow the renderer to have multiple materials and then switch materials through the setMaterial interface
KHRmeshquantization	Supports vertex data compression to save video memory. For example, vertex data is generally floating point numbers, which can be saved as an integer
KHRtexturetransform	Supports texture scaling displacement transformation
KHR_lights_punctual	Support for extended lighting, including direction light ，point light ， spot light