C:/Doug/CSharp/XnaCollisionLib/XnaCollisionLib/CollisionHelper.cs

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using System;
using Microsoft.Xna.Framework;

namespace XnaCollisionLib
{
    public class CollisionHelper
    {
        public static void AddToBox(ref BoundingBox box, Vector3 point)
        {
            if (point.X < box.Min.X)
                box.Min.X = point.X;
            if (point.X > box.Max.X)
                box.Max.X = point.X;

            if (point.Y < box.Min.Y)
                box.Min.Y = point.Y;
            if (point.Y > box.Max.Y)
                box.Max.Y = point.Y;

            if (point.Z < box.Min.Z)
                box.Min.Z = point.Z;
            if (point.Z > box.Max.Z)
                box.Max.Z = point.Z;
        }

        public static bool IsZero(float value)
        {
            return Math.Abs(value) < 0.000001f;
        }

        public static float Reciprocal(float value)
        {
            return 1.0f / value;
        }

        public static float Clamp(float value, float low, float high)
        {
            if (value < low)
                value = low;
            if (value > high)
                value = high;
            return value;
        }

        public static float DistanceTo(Plane plane, Vector3 point)
        {
            return Vector3.Dot(plane.Normal, point) + plane.D;
        }

        public static Plane CreatePlane(Vector3 normal, Vector3 origin)
        {
            return new Plane(normal, -Vector3.Dot(normal, origin));
        }
    }
}