cam_pos      = [0.66325, 1.44532, 1.30784]';
cam_dir      = [-0.694402, -0.115967, 0.710181]';
cam_up       = [-0.252628, 0.963397, -0.0896997]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [0.896133, 0.321461, 0.928714]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;