Vendor dependencies for 0.3.0 release

vendor/gltf/examples/tree/main.rs

@@ -0,0 +1,42 @@
+use std::boxed::Box;
+use std::error::Error as StdError;
+use std::{fs, io};
+
+fn print_tree(node: &gltf::Node, depth: i32) {
+    for _ in 0..(depth - 1) {
+        print!("  ");
+    }
+    print!(" -");
+    print!(" Node {}", node.index());
+    #[cfg(feature = "names")]
+    print!(" ({})", node.name().unwrap_or("<Unnamed>"));
+    println!();
+
+    for child in node.children() {
+        print_tree(&child, depth + 1);
+    }
+}
+
+fn run(path: &str) -> Result<(), Box<dyn StdError>> {
+    let file = fs::File::open(path)?;
+    let reader = io::BufReader::new(file);
+    let gltf = gltf::Gltf::from_reader(reader)?;
+    for scene in gltf.scenes() {
+        print!("Scene {}", scene.index());
+        #[cfg(feature = "names")]
+        print!(" ({})", scene.name().unwrap_or("<Unnamed>"));
+        println!();
+        for node in scene.nodes() {
+            print_tree(&node, 1);
+        }
+    }
+    Ok(())
+}
+
+fn main() {
+    if let Some(path) = std::env::args().nth(1) {
+        run(&path).expect("runtime error");
+    } else {
+        println!("usage: gltf-tree <FILE>");
+    }
+}