diff --git a/src/Arts.cs b/src/Arts.cs
index 77b4a42..aaa9565 100644
--- a/src/Arts.cs
+++ b/src/Arts.cs
@@ -152,9 +152,13 @@ static class Arts
         Quat rvolv_ori = Rig.l_aim.orientation;
         Vec3 rvolv_pos = Rig.l_aim.position;
 
-        Lines.Add(
+        Ray ray = new(
             rvolv_pos,
-            rvolv_pos + rvolv_ori * V.XYZ(0, 0, -10),
+            rvolv_ori * Vec3.Forward
+        );
+        Lines.Add(
+            ray,
+            10.0f, // [!] hardcoded design value
             Color.Hex(0xF9BF05FF).ToLinear(),
             U.cm
         );