Function convert 

pub fn convert(input: PathBuf, output: PathBuf, ascii: bool) -> Result<()>

Convert between 3D formats (3MF, STL, OBJ).

Auto-detects formats based on file extensions and performs the appropriate conversion.

Supported conversions:

• STL (binary or ASCII, auto-detected) → 3MF
• OBJ → 3MF
• 3MF → STL (binary by default, ASCII with ascii = true)
• 3MF → OBJ

Arguments

• input - Input file path
• output - Output file path
• ascii - When true and output is .stl, write ASCII STL instead of binary

Errors

Returns an error if the format is unsupported or conversion fails.

Example

use lib3mf_cli::commands::convert;
use std::path::PathBuf;

// Binary STL export (default)
convert(PathBuf::from("mesh.stl"), PathBuf::from("model.3mf"), false)?;
// ASCII STL export
convert(PathBuf::from("model.3mf"), PathBuf::from("mesh.stl"), true)?;