threemf2 0.2.0

3MF (3D Manufacturing Format) file format support
Documentation 
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use threemf2::{core::model::Model, io::CachePolicy, io::ThreemfPackageLazyReader};

use std::{fs::File, path::PathBuf};

/// This is an example showing unpacking the package and manually deserializing the root model
/// run with
/// `cargo run --example unpack --no-default-features --features io-lazy-read`
///
fn main() {
    let path = PathBuf::from("./tests/data/mesh-composedpart-separate-model-files.3mf");
    let reader = File::open(path).unwrap();

    let result = ThreemfPackageLazyReader::from_reader_with_memory_optimized_deserializer(
        reader,
        CachePolicy::NoCache,
    );

    match result {
        Ok(unpacked) => {
            let mut model: Option<Model> = None;
            //let model = serde_roxmltree::from_str::<Model>(&unpacked.root);
            let result_from_model = unpacked.with_model_xml(unpacked.root_model_path(), |xml| {
                let deserialized = instant_xml::from_str::<Model>(xml).unwrap();
                model = Some(deserialized);
            });
            assert!(result_from_model.is_ok());
            match model {
                Some(model) => println!("Number of build items: {}", model.build.item.len()),
                None => println!("Error deserializing the model"),
            }
        }
        Err(err) => println!("Error reading the file: {:?}", err),
    }
}