cam_pos      = [0.381472, 1.82472, 0.83025]';
cam_dir      = [-0.935111, -0.273074, 0.225826]';
cam_up       = [-0.327592, 0.423239, -0.84472]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.179672, 1.14897, 0.645359]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;