BoundingBox's A pain in the but

I have spent a long time trying to ificiantly calculate bounding boxes for my terrain patches, i have resorted to bruteforce once the patch is created, the code is just a modifyed version of the standard xna method for calculting mesh bounding boxes. Here is a little update pic and the code used. I dont think this really needs an explanation, it just checks all vertices and then calculates the max and min bounds.

  public BoundingBox CalculateBoundingBox()
  
  {
  
    Vector3 Max = new Vector3(float.MinValue, float.MinValue, float.MinValue);
  
    Vector3 Min = new Vector3(float.MaxValue, float.MaxValue, float.MaxValue);
  
     for (int i = 0; i < VertexData.Length; i ++)
  
     {
  
       Vector3 vectCurrentVertex = VertexData[i].Position;
  
       if (VertexData[i].Position.X < Min.X) Min.X = VertexData[i].Position.X;
  
       if (VertexData[i].Position.X > Max.X) Max.X = VertexData[i].Position.X;
  
       if (VertexData[i].Position.Y < Min.Y) Min.Y = VertexData[i].Position.Y;

  
       if (VertexData[i].Position.Y > Max.Y) Max.Y = VertexData[i].Position.Y;
  
       if (VertexData[i].Position.Z < Min.Z) Min.Z = VertexData[i].Position.Z;
  
       if (VertexData[i].Position.Z > Max.Z) Max.Z = VertexData[i].Position.Z;
  
     }
  
     return new BoundingBox(Min, Max); 
  
  }