cam_pos      = [-0.0353663, 1.15108, 0.723898]';
cam_dir      = [0.823589, 0.416329, 0.38519]';
cam_up       = [-0.567186, 0.605861, 0.557882]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.0014752, 0.90166, -0.977706]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;