code: function setProjection(w, h) {
           this.flush();
           this.gl.viewport(0, 0, w, h);
           this.uMatrix.setTransform(2 / w, 0, 0, 0, -2 / h, 0, -1, 1, 1);
         }
docs: Sets the projection matrix with the given size
  @name setProjection
  @memberOf me.WebGLRenderer.Compositor
  @function
  @param {Number} w WebGL Canvas width
  @param {Number} h WebGL Canvas height