diff --git a/Shared/LinesOfSight.cs b/Shared/LinesOfSight.cs
index 6ca2b33..de602b1 100644
--- a/Shared/LinesOfSight.cs
+++ b/Shared/LinesOfSight.cs
@@ -6,13 +6,15 @@ namespace SemiColinGames {
   class LinesOfSight : IDisposable {
 
     const int numEdgeVertices = 60;
+
+    readonly VertexBuffer vertexBuffer;
+    readonly IndexBuffer indexBuffer;
     // coneVertices[0] is the eye position; the rest are the edge vertices.
-    VertexPositionColor[] coneVertices = new VertexPositionColor[numEdgeVertices + 1];
-    Color color = Color.FromNonPremultiplied(new Vector4(0, 0, 1, 0.6f));
+    readonly VertexPositionColor[] coneVertices = new VertexPositionColor[numEdgeVertices + 1];
     // The number of total triangles drawn is one less than the number of edge points.
-    int[] indices = new int[(numEdgeVertices - 1) * 3];
-    VertexBuffer vertexBuffer;
-    IndexBuffer indexBuffer;
+    readonly int[] indices = new int[(numEdgeVertices - 1) * 3];
+
+    Color color = Color.FromNonPremultiplied(new Vector4(0, 0, 1, 0.6f));
 
     public LinesOfSight(GraphicsDevice graphics) {
       vertexBuffer = new VertexBuffer(
@@ -72,8 +74,7 @@ namespace SemiColinGames {
       }
     }
 
-    public void Draw(Player player, AABB[] collisionTargets, GraphicsDevice graphics,
-        BasicEffect lightingEffect) {
+    public void Draw(GraphicsDevice graphics, BasicEffect lightingEffect) {
 
       for (int i = 0; i < numEdgeVertices - 1; i++) {
         indices[i * 3] = 0;
diff --git a/Shared/Scene.cs b/Shared/Scene.cs
index 33578dd..3b51a53 100644
--- a/Shared/Scene.cs
+++ b/Shared/Scene.cs
@@ -91,7 +91,7 @@ namespace SemiColinGames {
       graphics.Clear(new Color(0, 0, 0, 0f));
       lightingEffect.Projection = camera.Projection;
       if (Debug.Enabled) {
-        linesOfSight.Draw(player, world.CollisionTargets, graphics, lightingEffect);
+        linesOfSight.Draw(graphics, lightingEffect);
       }
 
       // Draw debug rects & lines on top.