function _normalizeColor(_arr){
  var arr = [];
  _arr.forEach(function(val){
    arr.push(val/255);
  });
  return arr;
}
[textureMaterial description]
@return {[type]} [description]
@example
<div>
<code>
var img;
var theta = 0;
img = loadImage("assets/cat.jpg");
background(255, 255, 255, 255);
translate(0, 0, -200);
push();
rotateZ(theta * mouseX * 0.001);
rotateX(theta * mouseX * 0.001);
rotateY(theta * mouseX * 0.001);
// pass image as texture
texture(img);
box(40);
pop();
theta += 0.05;
</code>
</div>