Crate gltf [−] [src]

glTF 2.0 loader

This crate is intended to load glTF 2.0, a file format designed for the efficient runtime transmission of 3D scenes. The crate aims to provide rustic utilities that make working with glTF simple and intuitive.

Installation

Add gltf version 0.8 to your Cargo.toml.

[dependencies.gltf]
version = "0.8"

Examples

Walking the node hierarchy

Below demonstates visiting the root Nodes of every Scene, printing the number of children each node has.

let file = std::fs::File::open("examples/Box.gltf")?;
let reader = std::io::BufReader::new(file);
let json = gltf::json::from_reader(reader)?;
let gltf = gltf::Gltf::from_json(json);
for scene in gltf.scenes() {
    for node in scene.nodes() {
        // Do something with this node.
        println!(
            "Node {} has {} children",
            node.index(),
            node.children().count(),
        );
    }
}

Providing Gltf with external buffer data

The Source trait provides glTF objects with their buffer data. This allows the crate to provide more abstractions such as iterating over the positions of a Primitive. See the documentation of Loaded for all the methods available for loaded glTF.

The gltf-importer crate contains the reference implementation of the Source trait and may be used to read buffer data from the file system.

#[derive(Debug)]
struct BoxExampleData(&'static [u8]);

impl gltf::Source for BoxExampleData {
    fn source_buffer(&self, _: &gltf::Buffer) -> &[u8] {
        // In a real implementation, the `Source` must provide all the data
        // necessary to load the object, and must not fail.
        //
        // This example meets the above criteria, since it provides all the data
        // for the 'Box' sample model, which has exactly one external buffer.
        self.0
    }
}

let buffer_data = include_bytes!(concat!(env!("CARGO_MANIFEST_DIR"), "/examples/Box0.bin"));
let data = BoxExampleData(buffer_data);
let loaded_gltf = gltf.loaded(&data);
for mesh in loaded_gltf.meshes() {
    for primitive in mesh.primitives() {
        if let Some(iter) = primitive.indices_u32() {
            // Do something with the primitive data.
            let indices: Vec<u32> = iter.collect();
            println!("{:?}", indices);
        }
    }
}