diff --git a/src/color.rs b/src/color.rs
index 360bb84..e2b2e35 100644
--- a/src/color.rs
+++ b/src/color.rs
@@ -397,14 +397,6 @@ impl XYZ {
         XYZ { x: x, y: y, z: z }
     }
 
-    pub fn from_tuple(xyz: (f32, f32, f32)) -> XYZ {
-        XYZ {
-            x: xyz.0,
-            y: xyz.1,
-            z: xyz.2,
-        }
-    }
-
     pub fn from_wavelength(wavelength: f32, intensity: f32) -> XYZ {
         XYZ {
             x: x_1931(wavelength) * intensity,
diff --git a/src/parse/psy_light.rs b/src/parse/psy_light.rs
index f23ef54..22c0386 100644
--- a/src/parse/psy_light.rs
+++ b/src/parse/psy_light.rs
@@ -7,7 +7,6 @@ use nom::{call, closure, tuple, tuple_parser, IResult};
 use mem_arena::MemArena;
 
 use crate::{
-    color::{rec709_e_to_xyz, Color},
     light::{DistantDiskLight, RectangleLight, SphereLight},
     math::Vector,
 };
diff --git a/src/parse/psy_surface_shader.rs b/src/parse/psy_surface_shader.rs
index ebd1380..c86d370 100644
--- a/src/parse/psy_surface_shader.rs
+++ b/src/parse/psy_surface_shader.rs
@@ -2,14 +2,11 @@
 
 use std::result::Result;
 
-use nom::{call, closure, tuple, tuple_parser, IResult};
+use nom::IResult;
 
 use mem_arena::MemArena;
 
-use crate::{
-    color::{rec709_e_to_xyz, Color},
-    shading::{SimpleSurfaceShader, SurfaceShader},
-};
+use crate::shading::{SimpleSurfaceShader, SurfaceShader};
 
 use super::{
     basics::ws_f32,
diff --git a/src/shading/mod.rs b/src/shading/mod.rs
index c82c98f..73fab72 100644
--- a/src/shading/mod.rs
+++ b/src/shading/mod.rs
@@ -10,7 +10,7 @@ use self::surface_closure::SurfaceClosure;
 pub trait SurfaceShader: Debug + Sync {
     /// Takes the result of a surface intersection and returns the surface
     /// closure to be evaluated at that intersection point.
-    fn shade(&self, data: &SurfaceIntersectionData, time: f32, wavelength: f32) -> SurfaceClosure;
+    fn shade(&self, data: &SurfaceIntersectionData, time: f32) -> SurfaceClosure;
 }
 
 /// Clearly we must eat this brownie before the world ends, lest it
@@ -40,7 +40,7 @@ pub enum SimpleSurfaceShader {
 }
 
 impl SurfaceShader for SimpleSurfaceShader {
-    fn shade(&self, data: &SurfaceIntersectionData, time: f32, wavelength: f32) -> SurfaceClosure {
+    fn shade(&self, data: &SurfaceIntersectionData, time: f32) -> SurfaceClosure {
         let _ = (data, time); // Silence "unused" compiler warning
 
         match *self {
diff --git a/src/shading/surface_closure.rs b/src/shading/surface_closure.rs
index 6699a66..1d01280 100644
--- a/src/shading/surface_closure.rs
+++ b/src/shading/surface_closure.rs
@@ -210,7 +210,7 @@ mod lambert_closure {
     }
 
     pub fn estimate_eval_over_sphere_light(
-        color: Color,
+        _color: Color,
         inc: Vector,
         to_light_center: Vector,
         light_radius_squared: f32,
@@ -411,9 +411,9 @@ mod ggx_closure {
     }
 
     pub fn estimate_eval_over_sphere_light(
-        col: Color,
+        _col: Color,
         roughness: f32,
-        fresnel: f32,
+        _fresnel: f32,
         inc: Vector,
         to_light_center: Vector,
         light_radius_squared: f32,
@@ -548,16 +548,13 @@ mod emit_closure {
     }
 
     pub fn estimate_eval_over_sphere_light(
-        color: Color,
-        inc: Vector,
-        to_light_center: Vector,
-        light_radius_squared: f32,
-        nor: Normal,
-        nor_g: Normal,
+        _color: Color,
+        _inc: Vector,
+        _to_light_center: Vector,
+        _light_radius_squared: f32,
+        _nor: Normal,
+        _nor_g: Normal,
     ) -> f32 {
-        // Not using these, silence warning
-        let _ = (inc, to_light_center, light_radius_squared, nor, nor_g);
-
         // TODO: what to do here?
         unimplemented!()
     }
diff --git a/src/surface/triangle_mesh.rs b/src/surface/triangle_mesh.rs
index 4aa7940..1a4373f 100644
--- a/src/surface/triangle_mesh.rs
+++ b/src/surface/triangle_mesh.rs
@@ -263,11 +263,7 @@ impl<'a> Surface for TriangleMesh<'a> {
                                 // Fill in intersection data
                                 isects[r.id as usize] = SurfaceIntersection::Hit {
                                     intersection_data: intersection_data,
-                                    closure: shader.shade(
-                                        &intersection_data,
-                                        wr.time,
-                                        wr.wavelength,
-                                    ),
+                                    closure: shader.shade(&intersection_data, wr.time),
                                 };
                                 r.max_t = t;
                             }