BEPUphysics

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           //Read the world file and load terrainmap.
            mWorld = new World("testMap.wld");

            //Create the terrain.
            int xLength = 127;
            int zLength = 127;
            float xSpacing = 10f;
            float zSpacing = 10f;
            var heights = new float[xLength, zLength];

            heights = mWorld.myTerrain.getHeights();

            var terrain = new Terrain(heights, new AffineTransform(
            new Vector3(xSpacing, 1, zSpacing),
                    Quaternion.Identity,
                    new Vector3(-xLength * xSpacing / 2, 0, -zLength * zSpacing / 2)));

            terrain.Thickness = 5; //Uncomment this and shoot some things at the bottom of the terrain! They'll be sucked up through the ground.
            space.Add(terrain);
            ModelDrawer.Add(terrain);
            ModelDrawer.IsWireframe = true;

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     public void DrawTerrain()
        {
            RasterizerState rs = new RasterizerState();
            rs.CullMode = CullMode.None;
            rs.FillMode = FillMode.WireFrame;
            GraphicsDevice.RasterizerState = rs;
  
            effect.CurrentTechnique = effect.Techniques["ColoredNoShading"];
            effect.Parameters["xView"].SetValue(Camera.ViewMatrix);
            effect.Parameters["xProjection"].SetValue(Camera.ProjectionMatrix);
            effect.Parameters["xWorld"].SetValue(Camera.WorldMatrix);

            //Set our terrain vertex buffer objects.
            device.Indices = mWorld.myTerrain.iBuf;
            device.SetVertexBuffer(mWorld.myTerrain.vBuf);

            foreach (EffectPass pass in effect.CurrentTechnique.Passes)
            {
                pass.Apply();

                device.DrawIndexedPrimitives(PrimitiveType.TriangleList, 0, 0, mWorld.myTerrain.Vertices.Length, 0, (mWorld.myTerrain.Indices.Length / 3));
            }

        }

        protected override void Draw(GameTime gameTime)
        {
            GraphicsDevice.Clear(Color.Black);
            ModelDrawer.Draw(Camera.ViewMatrix, Camera.ProjectionMatrix);
          
            //DRAW OUR OWN TERRAIN
            DrawTerrain();

            base.Draw(gameTime);
        }

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   var terrain = new Terrain(heights, new AffineTransform(
             new Vector3(xSpacing, 1, zSpacing),
                    Quaternion.Identity,
                    new Vector3(0, 0, 0)));
                    // new Vector3(-xLength * xSpacing / 2, 0, -zLength * zSpacing / 2)));

           //terrain.Thickness = 5; //Uncomment this and shoot some things at the bottom of the terrain! They'll be sucked up through the ground.
            space.Add(terrain);

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effect.Parameters["xWorld"].SetValue(Matrix.Identity);