Gltf loader now shows which file is missing pre baked tangents (#11854)

# Objective

- Gltf loader now shows which file is missing pre baked tangents
- Fixes #11831

## Solution

- The file name is shown in the error message


- What changed as a result of this PR?
### Changed:
- Gltf loader now shows which file is missing pre baked tangents

- If this PR is a breaking change (relative to the last release of
Bevy), describe how a user might need to migrate their code to support
these changes
- Simply adding new functionality is not a breaking change.
- Fixing behavior that was definitely a bug, rather than a questionable
design choice is not a breaking change.

crates/bevy_gltf/src/loader.rs

@@ -8,7 +8,7 @@ use bevy_core_pipeline::prelude::Camera3dBundle;
 use bevy_ecs::entity::EntityHashMap;
 use bevy_ecs::{entity::Entity, world::World};
 use bevy_hierarchy::{BuildWorldChildren, WorldChildBuilder};
-use bevy_log::{error, warn};
+use bevy_log::{error, info_span, warn};
 use bevy_math::{Mat4, Vec3};
 use bevy_pbr::{
     AlphaMode, DirectionalLight, DirectionalLightBundle, PbrBundle, PointLight, PointLightBundle,
@@ -46,6 +46,7 @@ use gltf::{
     Material, Node, Primitive, Semantic,
 };
 use serde::{Deserialize, Serialize};
+use std::io::Error;
 use std::{
     collections::VecDeque,
     path::{Path, PathBuf},
@@ -181,6 +182,15 @@ async fn load_gltf<'a, 'b, 'c>(
     settings: &'b GltfLoaderSettings,
 ) -> Result<Gltf, GltfError> {
     let gltf = gltf::Gltf::from_slice(bytes)?;
+    let file_name = load_context
+        .asset_path()
+        .path()
+        .to_str()
+        .ok_or(GltfError::Gltf(gltf::Error::Io(Error::new(
+            std::io::ErrorKind::InvalidInput,
+            "Gltf file name invalid",
+        ))))?
+        .to_string();
     let buffer_data = load_buffers(&gltf, load_context).await?;
 
     let mut linear_textures = HashSet::default();
@@ -376,7 +386,6 @@ async fn load_gltf<'a, 'b, 'c>(
         }
         materials.push(handle);
     }
-
     let mut meshes = vec![];
     let mut named_meshes = HashMap::default();
     let mut meshes_on_skinned_nodes = HashSet::default();
@@ -481,14 +490,19 @@ async fn load_gltf<'a, 'b, 'c>(
                 && primitive.material().normal_texture().is_some()
             {
                 bevy_log::debug!(
-                    "Missing vertex tangents, computing them using the mikktspace algorithm"
+                    "Missing vertex tangents for {}, computing them using the mikktspace algorithm. Consider using a tool such as Blender to pre-compute the tangents.", file_name
                 );
-                if let Err(err) = mesh.generate_tangents() {
+
-                    warn!(
+                let generate_tangents_span = info_span!("generate_tangents", name = file_name);
+
+                generate_tangents_span.in_scope(|| {
+                    if let Err(err) = mesh.generate_tangents() {
+                        warn!(
                         "Failed to generate vertex tangents using the mikktspace algorithm: {:?}",
                         err
                     );
-                }
+                    }
+                });
             }
 
             let mesh = load_context.add_labeled_asset(primitive_label, mesh);