2 files changed, 68 insertions, 3 deletions
diff --git a/crates/render-core/src/lib.rs b/crates/render-core/src/lib.rs
index 8e0b5e8..ddb93fb 100644
--- a/crates/render-core/src/lib.rs
+++ b/crates/render-core/src/lib.rs
@@ -1,8 +1,14 @@
 use msh_core::Model;
 
 #[derive(Clone, Debug)]
+pub struct RenderVertex {
+    pub position: [f32; 3],
+    pub uv0: [f32; 2],
+}
+
+#[derive(Clone, Debug)]
 pub struct RenderMesh {
-    pub vertices: Vec<[f32; 3]>,
+    pub vertices: Vec<RenderVertex>,
     pub batch_count: usize,
 }
 
@@ -18,6 +24,7 @@ impl RenderMesh {
 pub fn build_render_mesh(model: &Model, lod: usize, group: usize) -> RenderMesh {
     let mut vertices = Vec::new();
     let mut batch_count = 0usize;
+    let uv0 = model.uv0.as_ref();
 
     for node_index in 0..model.node_count {
         let Some(slot_idx) = model.slot_index(node_index, lod, group) else {
@@ -48,7 +55,15 @@ pub fn build_render_mesh(model: &Model, lod: usize, group: usize) -> RenderMesh
                 let Some(pos) = model.positions.get(final_idx) else {
                     continue;
                 };
-                vertices.push(*pos);
+                let uv = uv0
+                    .and_then(|uvs| uvs.get(final_idx))
+                    .copied()
+                    .map(|packed| [packed[0] as f32 / 1024.0, packed[1] as f32 / 1024.0])
+                    .unwrap_or([0.0, 0.0]);
+                vertices.push(RenderVertex {
+                    position: *pos,
+                    uv0: uv,
+                });
             }
             batch_count += 1;
         }
@@ -80,5 +95,25 @@ pub fn compute_bounds(vertices: &[[f32; 3]]) -> Option<([f32; 3], [f32; 3])> {
     Some((min_v, max_v))
 }
 
+pub fn compute_bounds_for_mesh(vertices: &[RenderVertex]) -> Option<([f32; 3], [f32; 3])> {
+    let mut iter = vertices.iter();
+    let first = iter.next()?;
+    let mut min_v = first.position;
+    let mut max_v = first.position;
+
+    for v in iter {
+        for i in 0..3 {
+            if v.position[i] < min_v[i] {
+                min_v[i] = v.position[i];
+            }
+            if v.position[i] > max_v[i] {
+                max_v[i] = v.position[i];
+            }
+        }
+    }
+
+    Some((min_v, max_v))
+}
+
 #[cfg(test)]
 mod tests;
diff --git a/crates/render-core/src/tests.rs b/crates/render-core/src/tests.rs
index 9c5eb5d..22103c6 100644
--- a/crates/render-core/src/tests.rs
+++ b/crates/render-core/src/tests.rs
@@ -74,9 +74,17 @@ fn build_render_mesh_for_real_models() {
             if !mesh.vertices.is_empty() {
                 meshes_non_empty += 1;
             }
-            if compute_bounds(&mesh.vertices).is_some() {
+            if compute_bounds_for_mesh(&mesh.vertices).is_some() {
                 bounds_non_empty += 1;
             }
+            for vertex in &mesh.vertices {
+                assert!(
+                    vertex.uv0[0].is_finite() && vertex.uv0[1].is_finite(),
+                    "UV must be finite for '{}' in {}",
+                    entry.meta.name,
+                    archive_path.display()
+                );
+            }
         }
     }
 
@@ -99,3 +107,25 @@ fn compute_bounds_handles_empty_and_non_empty() {
     assert_eq!(bounds.0, [-2.0, -1.0, 0.5]);
     assert_eq!(bounds.1, [1.0, 5.0, 9.0]);
 }
+
+#[test]
+fn compute_bounds_for_mesh_handles_empty_and_non_empty() {
+    assert!(compute_bounds_for_mesh(&[]).is_none());
+    let bounds = compute_bounds_for_mesh(&[
+        RenderVertex {
+            position: [1.0, 2.0, 3.0],
+            uv0: [0.0, 0.0],
+        },
+        RenderVertex {
+            position: [-2.0, 5.0, 0.5],
+            uv0: [0.2, 0.3],
+        },
+        RenderVertex {
+            position: [0.0, -1.0, 9.0],
+            uv0: [1.0, 1.0],
+        },
+    ])
+    .expect("bounds expected");
+    assert_eq!(bounds.0, [-2.0, -1.0, 0.5]);
+    assert_eq!(bounds.1, [1.0, 5.0, 9.0]);
+}