diff --git a/src/main.rs b/src/main.rs
index 3f0c9ce..7d2d401 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,21 +4,21 @@ use hello::math::{Mat4x4, Point3, Vector3};
 use std::rc::Rc;
 
 #[derive(Clone)]
-struct RGB {
-    red: f64,
-    green: f64,
-    blue: f64,
+struct RGB<T> {
+    red: T,
+    green: T,
+    blue: T,
 }
 
 #[derive(Clone)]
-struct Texture {
+struct Texture<T> {
     width: usize,
     height: usize,
-    pixel: Vec<RGB>,
+    pixel: Vec<RGB<T>>,
 }
 
-impl Texture {
-    fn load_texture() -> Texture {
+impl Texture<f64> {
+    fn load_texture() -> Texture<f64> {
         let width = 640;
         let height = 480;
 
@@ -45,11 +45,11 @@ impl Texture {
 struct RenderableGeometry {
     transform: Mat4x4,
     geometry: Geometry,
-    texture: Rc<Texture>,
+    texture: Rc<Texture<f64>>,
 }
 
 impl RenderableGeometry {
-    fn new(transform: Mat4x4, geometry: Geometry, texture: Rc<Texture>) -> RenderableGeometry {
+    fn new(transform: Mat4x4, geometry: Geometry, texture: Rc<Texture<f64>>) -> RenderableGeometry {
         RenderableGeometry {
             transform,
             geometry,