Wavefront OBJ to raw vertices, used for importing models to PSP, very primitive

Cargo.toml

[package]
name = "obj2verts"
version = "0.1.0"
authors = ["Paul Sajna <sajattack@gmail.com>"]
edition = "2018"

[dependencies]
wavefront_obj = "8.0.0"
byteorder = "1.3.4"

main.rs

use wavefront_obj::obj::{self, Primitive};
use std::fs;
use byteorder::{LittleEndian, WriteBytesExt};

fn main() -> Result<(), std::io::Error> {
    let obj_string = fs::read_to_string("rustacean1.obj")?;
    let objects = obj::parse(obj_string).unwrap();
    let object = objects.objects[0].clone();
    let vertices_indexed = object.vertices;
    let normals_indexed = object.normals;
    let mut output_file = fs::File::create("rustacean1.raw")?;

    for shape in object.geometry[0].shapes.clone() {
        let primitive = shape.primitive;
        if let Primitive::Triangle(x, y, z) = primitive {
            // x.nx
            output_file.write_f32::<LittleEndian>(normals_indexed[x.2.unwrap()].x as f32)?;
            // x.ny
            output_file.write_f32::<LittleEndian>(normals_indexed[x.2.unwrap()].y as f32)?;
            // x.nz
            output_file.write_f32::<LittleEndian>(normals_indexed[x.2.unwrap()].z as f32)?;
            // x.px
            output_file.write_f32::<LittleEndian>(vertices_indexed[x.0].x as f32)?;
            // x.py
            output_file.write_f32::<LittleEndian>(vertices_indexed[x.0].y as f32)?;
            // x.pz
            output_file.write_f32::<LittleEndian>(vertices_indexed[x.0].z as f32)?;

            // y.nx
            output_file.write_f32::<LittleEndian>(normals_indexed[y.2.unwrap()].x as f32)?;
            // y.ny
            output_file.write_f32::<LittleEndian>(normals_indexed[y.2.unwrap()].y as f32)?;
            // y.nz
            output_file.write_f32::<LittleEndian>(normals_indexed[y.2.unwrap()].z as f32)?;
            // y.px
            output_file.write_f32::<LittleEndian>(vertices_indexed[y.0].x as f32)?;
            // y.py
            output_file.write_f32::<LittleEndian>(vertices_indexed[y.0].y as f32)?;
            // y.pz
            output_file.write_f32::<LittleEndian>(vertices_indexed[y.0].z as f32)?;

            // z.nx
            output_file.write_f32::<LittleEndian>(normals_indexed[z.2.unwrap()].x as f32)?;
            // z.ny
            output_file.write_f32::<LittleEndian>(normals_indexed[z.2.unwrap()].y as f32)?;
            // z.nz
            output_file.write_f32::<LittleEndian>(normals_indexed[z.2.unwrap()].z as f32)?;
            // z.px
            output_file.write_f32::<LittleEndian>(vertices_indexed[z.0].x as f32)?;
            // z.py
            output_file.write_f32::<LittleEndian>(vertices_indexed[z.0].y as f32)?;
            // z.pz
            output_file.write_f32::<LittleEndian>(vertices_indexed[z.0].z as f32)?;
        }
    }
    Ok(())
}