cam_pos      = [0.381472, 1.82472, 0.83025]';
cam_dir      = [-0.935111, -0.273074, 0.225826]';
cam_up       = [-0.322156, 0.389712, -0.862751]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.196291, 1.16976, 0.601688]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;