code: public void setCombinedMatrix(OrthographicCamera camera) {
  		this.setCombinedMatrix(
  				camera.combined,
  				camera.position.x,
  				camera.position.y,
  				camera.viewportWidth * camera.zoom,
  				camera.viewportHeight * camera.zoom);
  	}
docs: Sets combined matrix basing on camera position, rotation and zoom
  
  <p> Same as calling:
  {@code setCombinedMatrix(
  camera.combined,
  camera.position.x,
  camera.position.y,
  camera.viewportWidth * camera.zoom,
  camera.viewportHeight * camera.zoom );}
  
  @see #setCombinedMatrix(Matrix4, float, float, float, float)