support updating positions and normals for mesh

src/renderer/geometry/mesh.rs

@@ -77,6 +77,37 @@ impl Mesh {
     pub fn set_animation(&mut self, animation: impl Fn(f32) -> Mat4 + Send + Sync + 'static) {
         self.animation = Some(Box::new(animation));
     }
+
+    /// Updates the vertex positions of the mesh.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the number of positions does not match the number of vertices in the mesh.
+    pub fn update_positions(&mut self, positions: &[Vector3<f32>]) {
+        assert_eq!(
+            positions.len() as u32,
+            self.base_mesh.positions.vertex_count()
+        );
+        self.base_mesh.positions.fill(positions);
+    }
+
+    ///
+    /// Updates the vertex normals of the mesh.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the number of normals does not match the number of vertices in the mesh.
+    pub fn update_normals(&mut self, normals: &[Vector3<f32>]) {
+        assert_eq!(
+            normals.len() as u32,
+            self.base_mesh.positions.vertex_count()
+        );
+        if self.base_mesh.normals.is_none() {
+            self.base_mesh.normals = Some(VertexBuffer::new_with_data(&self.context, normals));
+        } else {
+            self.base_mesh.normals.as_mut().unwrap().fill(normals);
+        }
+    }
 }
 
 impl<'a> IntoIterator for &'a Mesh {