Remove unused imports.

src/camera.rs

@@ -1,7 +1,5 @@
 #![allow(dead_code)]
 
-use kioku::Arena;
-
 use crate::{
     lerp::lerp_slice,
     math::{Point, Vector, Xform},

src/image.rs

@@ -253,7 +253,6 @@ impl<'a> Bucket<'a> {
     where
         F: Fn((f32, f32, f32)) -> (f32, f32, f32),
     {
-        use std::slice;
         let mut data: Vec<u8> = Vec::with_capacity(
             std::mem::size_of::<f32>()
                 * (4 * (self.max.0 - self.min.0) * (self.max.1 - self.min.1)) as usize,

src/tracer.rs

@@ -1,10 +1,9 @@
 use crate::{
-    color::Color,
     lerp::lerp_slice,
     math::XformFull,
     ray::{LocalRay, Ray},
     scene::{Assembly, InstanceType, Object},
-    shading::{SimpleSurfaceShader, SurfaceShader},
+    shading::SurfaceShader,
     surface::SurfaceIntersection,
 };