Hotfix (#59)

* introduce mesh builder trait

* remove old construction traits

* split builder into two

* use bufwriter properly

* refactor mesh writer, add obj writer

* improve read error handling

* update examples

* add script for running all examples

* update readme

* format

* fix wasm build

* fix readme and obj reading bug

Author: dima634

README.md

@@ -47,14 +47,14 @@ For more control, you can use format-specific readers and writers directly:
 use baby_shark::io::{StlReader, StlWriter, ObjReader};
 
 // Using specific readers
-let mut stl_reader = StlReader::new();
+let mut stl_reader = StlReader::default();
 let mesh = stl_reader.read_from_file(Path::new("./mesh.stl"))?;
 
-let mut obj_reader = ObjReader::new(); 
+let mut obj_reader = ObjReader::default(); 
 let mesh = obj_reader.read_from_file(Path::new("./mesh.obj"))?;
 
 // Using specific writers
-let stl_writer = StlWriter::new();
+let stl_writer = StlWriter::default();
 stl_writer.write_to_file(&mesh, Path::new("./output.stl"))?;
 ```
 

src/io/obj.rs

@@ -134,6 +134,6 @@ fn parse_face<'a>(mut parts: impl Iterator<Item = &'a str>) -> Option<Statement>
 }
 
 fn parse_vertex_idx_from_face_stmt(stmt: &str) -> Option<usize> {
-    let (vertex_idx_str, _) = stmt.split_once('/')?;
+    let (vertex_idx_str, _) = stmt.split_once('/').unwrap_or((stmt, ""));
     vertex_idx_str.parse::<usize>().map(|idx| idx - 1).ok() // obj indices are 1-based
 }