diff --git a/src/BoundingFrustum.cs b/src/BoundingFrustum.cs
index 2090e13..a175a75 100644
--- a/src/BoundingFrustum.cs
+++ b/src/BoundingFrustum.cs
@@ -470,64 +470,7 @@ namespace Microsoft.Xna.Framework
 				throw new ArgumentOutOfRangeException("ctype");
 			}
 
-			// TODO: Needs additional test for not 0.0 and null results.
-			result = null;
-			float min = float.MinValue;
-			float max = float.MaxValue;
-			foreach (Plane plane in planes)
-			{
-				Vector3 normal = plane.Normal;
-				float result2;
-				Vector3.Dot(ref ray.Direction, ref normal, out result2);
-				float result3;
-				Vector3.Dot(ref ray.Position, ref normal, out result3);
-				result3 += plane.D;
-				if ((double) Math.Abs(result2) < 9.99999974737875E-06)
-				{
-					if ((double) result3 > 0.0)
-					{
-						return;
-					}
-				}
-				else
-				{
-					float result4 = -result3 / result2;
-					if ((double) result2 < 0.0)
-					{
-						if ((double) result4 > (double) max)
-						{
-							return;
-						}
-						if ((double) result4 > (double) min)
-						{
-							min = result4;
-						}
-					}
-					else
-					{
-						if ((double) result4 < (double) min)
-						{
-							return;
-						}
-						if ((double) result4 < (double) max)
-						{
-							max = result4;
-						}
-					}
-				}
-				float? distance = ray.Intersects(plane);
-				if (distance.HasValue)
-				{
-					min = Math.Min(min, distance.Value);
-					max = Math.Max(max, distance.Value);
-				}
-			}
-			float temp = min >= 0.0 ? min : max;
-			if (temp < 0.0)
-			{
-				return;
-			}
-			result = temp;
+			throw new NotImplementedException();
 		}
 
 		#endregion