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Newton + C#

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Hi folks, First, sorry if this is the wrong forum to post this kind of subject. So, I am trying to use Newton Physics Library with a DirectX C# application (using this wrapper). If I use only primitives, everything is fine, but when i use a Tree Collision (on the table) this is what happens: (Yellow lines are draw using debug functions of Newton) Free Image Hosting at www.ImageShack.us As you can see, the polygons get all messed up, and this is the code i have used to import the geometry:
List<Face> faces = new List<Face>();

GraphicsStream indexList = obj.ObjectMesh.IndexBuffer.Lock(0, 0, LockFlags.None);
GraphicsStream stm = obj.ObjectMesh.VertexBuffer.Lock(0, 0, LockFlags.None);

short[] indices = new short[obj.ObjectMesh.NumberFaces * 3];
for (int i = 0; i < obj.ObjectMesh.NumberFaces * 3; i++)
            indices = (short)indexList.Read(typeof(short));

Vector3[] vertices = new Vector3[obj.ObjectMesh.NumberVertices];
for (int i = 0; i < obj.ObjectMesh.NumberVertices; i++)

            vertices = (Vector3)stm.Read(typeof(Vector3));

float[] floats = new float[9];
for (int i = 0; i < obj.ObjectMesh.NumberFaces; i++)
            Face face = new Face();
            face.Vertex1.X = vertices[indices[(i * 3) + 0]].X;
            face.Vertex1.Y = vertices[indices[(i * 3) + 0]].Y;
            face.Vertex1.Z = vertices[indices[(i * 3) + 0]].Z;

            face.Vertex2.X = vertices[indices[(i * 3) + 1]].X;
            face.Vertex2.Y = vertices[indices[(i * 3) + 1]].Y;
            face.Vertex2.Z = vertices[indices[(i * 3) + 1]].Z;

            face.Vertex3.X = vertices[indices[(i * 3) + 2]].X;
            face.Vertex3.Y = vertices[indices[(i * 3) + 2]].Y;
            face.Vertex3.Z = vertices[indices[(i * 3) + 2]].Z;


TreeCollision collision = TreeCollision.newTreeCollision(world, faces, true);

The way I see it, the code above could be wrong, but the C# wrapper could have a bug as well. My question is if any of you have been through anything similar, and could shed some light? Thanks in advance, Leandro

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Is there a way to turn off Newton's collision optimisation through the wrapper? I'd try that.

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