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

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using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;

namespace XnaCollisionLib
{
    public class CollisionSource 
    {
        private List<OctTree> _List;
        private int _Count;

        public CollisionSource()
        {
            _List = new List<OctTree>();
            _Count = 0;
        }

        public int Count
        {
            get { return _Count; }
        }

        public void Clear()
        {
            _List.Clear();
            _Count = 0;
        }

        public Nullable<float> ISect(Ray ray, out Triangle nearestTriangle)
        {
            Nullable<float> t = null;
            float nearestDistance = float.MaxValue;

            nearestTriangle = new Triangle();
            foreach (OctTree node in _List)
            {
                Nullable<float> t2 = node.ISect(ray, ref nearestDistance, ref nearestTriangle);

                if (t2.HasValue)
                    t = t2;
            }
            return t;
        }

        public void Query(BoundingBox box, List<Triangle> triangles, Matrix transform)
        {
            foreach (OctTree node in _List)
                node.Query(box, triangles, transform);
        }

        public void Add(OctTree octTree)
        {
            _List.Add(octTree);
            _Count += octTree.Count;
        }

        public void Add(IEnumerable<Triangle> triangles, int minTrianglesPerNode)
        {
            Add(OctTree.Create(triangles, minTrianglesPerNode));
        }

        public void Add(Model model, int minTrianglesPerNode, Matrix transform)
        {
            Vector3[] points = model.Tag as Vector3[];
            Triangle[] triangles = new Triangle[points.Length / 3];

            for (int i = 0, j = 0; i != points.Length; j++)
            {
                Vector3 a = Vector3.Transform(points[i++], transform);
                Vector3 b = Vector3.Transform(points[i++], transform);
                Vector3 c = Vector3.Transform(points[i++], transform);

                triangles[j] = new Triangle(a, b, c);
            }
            Add(triangles, minTrianglesPerNode);
        }
    }
}