function Node(position, rotation, geometry)

{

    this.pos = position;

    this.rot = rotation;

    this.geometry = geometry;

    this.children = [];

}

Node.prototype.update = function(time)

{

    // this.right = [1, 0, 0];

    // this.up = [0, 1, 0];

    // this.target = [0, 0, -1];

    // var x = vec3.dot([1, 0, 0], this.pos);

    // var y = vec3.dot([0, 1, 0], this.pos);

    // var z = vec3.dot([0, 0, -1], this.pos);

    // this.matrix = mat4.create([this.right[0], this.up[0], -this.target[0], 0,

    //  			       this.right[1], this.up[1], -this.target[1], 0,

    //  			       this.right[2], this.up[2], -this.target[2], 0,

    //  			       -x, -y, z, 1]); 

    for (var id in this.children) this.children[id].update(time);

}

function CubeVbo(size, context)

{

    var gl = context.gl;

    this.size = size || 1;    

    this.positionBuffer = gl.createBuffer();

    gl.bindBuffer(gl.ARRAY_BUFFER, this.positionBuffer);

    var vertices = [

	     // Front face

            -1.0, -1.0,  1.0,

             1.0, -1.0,  1.0,

             1.0,  1.0,  1.0,

            -1.0,  1.0,  1.0,

            // Back face

            -1.0, -1.0, -1.0,

            -1.0,  1.0, -1.0,

             1.0,  1.0, -1.0,

             1.0, -1.0, -1.0,

            // Top face

            -1.0,  1.0, -1.0,

            -1.0,  1.0,  1.0,

             1.0,  1.0,  1.0,

             1.0,  1.0, -1.0,

            // Bottom face

            -1.0, -1.0, -1.0,

             1.0, -1.0, -1.0,

             1.0, -1.0,  1.0,

            -1.0, -1.0,  1.0,

            // Right face

             1.0, -1.0, -1.0,

             1.0,  1.0, -1.0,

             1.0,  1.0,  1.0,

             1.0, -1.0,  1.0,

            // Left face

            -1.0, -1.0, -1.0,

            -1.0, -1.0,  1.0,

            -1.0,  1.0,  1.0,

            -1.0,  1.0, -1.0];

    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(vertices), gl.STATIC_DRAW);

    this.positionBuffer.itemSize = 3;

    this.positionBuffer.numItems = 24;

    this.normalBuffer = gl.createBuffer();

    gl.bindBuffer(gl.ARRAY_BUFFER, this.normalBuffer);

    var normals = [// font face

		   0.0, 0.0, 1.0,

		   0.0, 0.0, 1.0,

		   0.0, 0.0, 1.0,

		   0.0, 0.0, 1.0,

		   // back face

		   0.0, 0.0, -1.0,

		   0.0, 0.0, -1.0,

		   0.0, 0.0, -1.0,

		   0.0, 0.0, -1.0,

		   // top face

		   0.0, 1.0, 0.0,

		   0.0, 1.0, 0.0,

		   0.0, 1.0, 0.0, 

		   0.0, 1.0, 0.0,

		   // bottom face

		   0.0, -1.0, 0.0,

		   0.0, -1.0, 0.0,

		   0.0, -1.0, 0.0,

		   0.0, -1.0, 0.0,

		   // right face

		   1.0, 0.0, 0.0,

		   1.0, 0.0, 0.0,

		   1.0, 0.0, 0.0,

		   1.0, 0.0, 0.0,

		   // left face

		   -1.0, 0.0, 0.0,

		   -1.0, 0.0, 0.0,

		   -1.0, 0.0, 0.0,

		   -1.0, 0.0, 0.0];

    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(normals), gl.STATIC_DRAW);

    this.normalBuffer.itemSize = 3;

    this.normalBuffer.numItems = 24;

    this.colourBuffer = gl.createBuffer();

    gl.bindBuffer(gl.ARRAY_BUFFER, this.colourBuffer);

    var alpha = 1.0;

    var uni = [1.0, 1.0, 1.0, alpha];

    var colours = [[0.0, 0.0, 0.0, alpha],

		   [0.0, 0.0, 0.0, alpha],

		   [0.0, 0.0, 0.0, alpha],

		   [0.0, 0.0, 0.0, alpha],

		   [0.0, 0.0, 0.0, alpha],

		   [0.0, 0.0, 0.0, alpha]];

    var unpackedColours = [];

    for (var i in colours)

    {

	var colour = uni;//colours[i];

	for (var j = 0; j < 4; j++)

	{

	    unpackedColours = unpackedColours.concat(colour);

	}

	//colours = colours.concat([0.5, 0.5, 1.0, 1.0]);

    }

    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(unpackedColours), gl.STATIC_DRAW);

    this.colourBuffer.itemSize = 4;

    this.colourBuffer.numItems = 24;

    this.indexBuffer = gl.createBuffer();

    gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, this.indexBuffer);

    var indices = [0, 1, 2, 0, 2, 3,

		   4, 5, 6, 4, 6, 7,

		   8, 9, 10, 8, 10, 11,

		   12, 13, 14, 12, 14, 15,

		   16, 17, 18, 16, 18, 19,

		   20, 21, 22, 20, 22, 23];

    gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(indices), gl.STATIC_DRAW);

    this.indexBuffer.itemSize = 1;

    this.indexBuffer.numItems = 36;

}

var id = 0;

function Cube(vbo)

{

    this.id = id++;

    this.vbo = vbo;

}