diff --git a/src/bin/pumpkin.rs b/src/bin/pumpkin.rs
index 8c975a3..47f589c 100644
--- a/src/bin/pumpkin.rs
+++ b/src/bin/pumpkin.rs
@@ -216,6 +216,11 @@ struct Arrow {
 	direction: Vec3,
 }
 
+struct RenderableArrow {
+	model_mat: Mat4,
+	inv_model_mat: Mat4,
+}
+
 fn main () {
 	let sdl_context = sdl2::init ().unwrap ();
 	let video_subsystem = sdl_context.video ().unwrap ();
@@ -408,7 +413,7 @@ fn main () {
 			},
 		];
 		
-		let arrow_mats: Vec <_> = arrows.iter ().map (|arrow| {
+		let renderable_arrows: Vec <_> = arrows.iter ().map (|arrow| {
 			let d = arrow.direction;
 			
 			let up: Vec3 = if d.z () > 0.5 {
@@ -432,9 +437,17 @@ fn main () {
 			dir_mat.set_y_axis ((up.x (), up.y (), up.z (), 0.0).into ());
 			dir_mat.set_z_axis ((d.x (), d.y (), d.z (), 0.0).into ());
 			
+			let model_mat =
 			Mat4::from_translation (arrow.origin) *
 			Mat4::from_scale ((0.125, 0.125, 0.125).into ()) *
-			dir_mat
+			dir_mat;
+			
+			let inv_model_mat = model_mat.inverse ();
+			
+			RenderableArrow {
+				model_mat,
+				inv_model_mat,
+			}
 		}).collect ();
 		
 		use uniforms::*;
@@ -474,10 +487,15 @@ fn main () {
 			});
 			
 			glezz::uniform_3fv (unis [&ALBEDO], &magenta);
-			for arrow_mat in &arrow_mats {
-				let mvp = view_mat * *arrow_mat;
+			for arrow in &renderable_arrows {
+				let mvp = view_mat * arrow.model_mat;
 				
 				glezz::uniform_matrix_4fv (unis [&MVP], &mvp);
+				let object_space_light = make_object_space_vec (&arrow.inv_model_mat, &light);
+				let object_space_sky = make_object_space_vec (&arrow.inv_model_mat, &Vec3::from ((0.0, 0.0, 1.0)));
+				glezz::uniform_3fv (unis [&OBJECT_SPACE_LIGHT], &object_space_light);
+				glezz::uniform_3fv (unis [&OBJECT_SPACE_SKY], &object_space_sky);
+				
 				mesh_arrow.draw_all (attrs, |_| true);
 			}
 			
@@ -520,8 +538,8 @@ fn main () {
 			
 			mesh_pitch.draw_all (attrs, |i| i != grass_index);
 			
-			for arrow_mat in &arrow_mats {
-				let mvp = view_mat * *arrow_mat;
+			for renderable_arrow in &renderable_arrows {
+				let mvp = view_mat * renderable_arrow.model_mat;
 				
 				glezz::uniform_matrix_4fv (unis [&MVP], &mvp);
 				mesh_arrow.draw_all (attrs, |_| true);