Update tutorial 13 to tobj 3.0.x

Cargo.lock

@@ -2239,7 +2239,7 @@ dependencies = [
  "image",
  "log",
  "rayon",
- "tobj 2.0.2",
+ "tobj 3.0.1",
  "wgpu",
  "winit",
 ]

code/intermediate/tutorial13-threading/Cargo.toml

@@ -13,7 +13,7 @@ futures = "0.3"
 image = "0.23"
 log = "0.4"
 rayon = "1.4" # NEW!
-tobj = "2.0"
+tobj = "3.0"
 wgpu = "0.8"
 winit = "0.24"
 

code/intermediate/tutorial13-threading/src/model.rs

@@ -1,3 +1,4 @@
+use tobj::LoadOptions;
 use anyhow::*;
 use rayon::prelude::*;
 use std::ops::Range;
@@ -125,7 +126,14 @@ impl Model {
         layout: &wgpu::BindGroupLayout,
         path: P,
     ) -> Result<Self> {
-        let (obj_models, obj_materials) = tobj::load_obj(path.as_ref(), true)?;
+        let (obj_models, obj_materials) = tobj::load_obj(path.as_ref(), &LoadOptions {
+                triangulate: true,
+                single_index: true,
+                ..Default::default()
+            },
+        )?;
+
+        let obj_materials = obj_materials?;
 
         // We're assuming that the texture files are stored with the obj file
         let containing_folder = path.as_ref().parent().context("Directory has no parent")?;