Function run_job 

pub fn run_job(
    format: &str,
    input: &Path,
    output: Option<&Path>,
    signature: Option<&Path>,
    mass: Option<&Path>,
    max_input_bytes: u64,
) -> Result<Mesh>

One job of the preview process (teamcraft preview-mesh): converts input into the preview mesh at output and/or writes the shape signature (a shape::Outcome as JSON) to signature. With CACHED_MESH as format, input is a cached preview mesh. A failed signature does not fail the conversion – the outcome records why. The mass properties (a massprops::Outcome as JSON) go to mass the same way. Returns the mesh (the CLI prints its size).