Prepare for follow-on change

experiments/2024-10-30/src/export.rs

@@ -5,8 +5,6 @@ use crate::geometry::{Mesh, Vertex};
 pub fn export(mesh: &Mesh) -> anyhow::Result<()> {
     let vertices = mesh
         .vertices()
-        .iter()
-        .copied()
         .map(|Vertex { point: [x, y, z] }| threemf::model::Vertex { x, y, z })
         .collect();
 

experiments/2024-10-30/src/geometry.rs

@@ -5,8 +5,8 @@ pub struct Mesh {
 }
 
 impl Mesh {
-    pub fn vertices(&self) -> &[Vertex] {
-        &self.vertices
+    pub fn vertices(&self) -> impl Iterator<Item = Vertex> + '_ {
+        self.vertices.iter().copied()
     }
 
     pub fn triangles(&self) -> impl Iterator<Item = Triangle> + '_ {

experiments/2024-10-30/src/render.rs

@@ -194,7 +194,9 @@ impl Renderer {
         for triangle in mesh.triangles() {
             let triangle = triangle.map(|index| {
                 Vec3::from(
-                    mesh.vertices()[index as usize]
+                    mesh.vertices()
+                        .nth(index as usize)
+                        .unwrap()
                         .point
                         .map(|coord| coord as f32),
                 )