reflection directly along normal

src/main.rs

@@ -37,6 +37,9 @@ pub struct Args {
     ///start in debug mode (e.g. without parallelization)
     #[arg(long)]
     debug: bool,
+    ///path tracing recursion depth
+    #[arg(long)]
+    recurse: usize
 }
 
 fn main() {