Got the vertex definition into the load function. Which is something

src/canvas/canvas_frame.rs

@@ -53,20 +53,44 @@ impl CanvasFrame {
     }
 }
 
+
+struct Pair<T> {
+    x: T,
+    y: T,
+}
+
+impl Pair<Vertex3D> {
+    fn new(x: Vertex3D, y: Vertex3D) -> Self {
+        Self {
+            x,
+            y,
+        }
+    }
+}
+
+impl Pair<GlyphInstance> {
+    fn new(x: GlyphInstance, y: GlyphInstance) -> Self {
+        Self {
+            x,
+            y,
+        }
+    }
+}
+
 pub struct GenericCanvasFrame<H, V, In> {
     frame_data: HashMap<H, Vec<(Vec<V>, Vec<In>)>>
 }
 
-impl<H, V, In> GenericCanvasFrame<H, V, In>  {
+impl<V, In> GenericCanvasFrame<Vertex3D, V, In>  {
 
     /// Creates a bare canvas frame with empty accumulators
-    pub fn new() -> GenericCanvasFrame<H, V, In> where H: Eq + Hash {
+    pub fn new() -> GenericCanvasFrame<Vertex3D, V, In> {
         GenericCanvasFrame {
             frame_data: Default::default()
         }
     }
 
-    pub fn draw(&mut self, drawable: &dyn DrawableTest<V, H, In>) where H: Eq + Hash + Clone {
+    pub fn draw(&mut self, drawable: &dyn DrawableTest<V, Vertex3D, In>) {
         self.frame_data
             .entry(drawable.get_handle().clone())
             .or_insert(Vec::new())