fn str_to_vec3(s: &str) -> Option<Vec3> {
    let bits: Vec<&str> = s.split(" ").collect();
    if bits.len() != 3 {
        return None;
    }

    Some(Vec3 {
        x: bits[0].parse().unwrap(),
        y: bits[1].parse().unwrap(),
        z: bits[2].parse().unwrap(),
    })

}

fn split_parse<T: std::str::FromStr>(text: &str, split: &str) -> Result<Vec<T>, T::Err> {
    text.split(split).map(str::parse).collect()
}