cam_pos      = [0.163948, 1.6834, 0.842425]';
cam_dir      = [-0.988333, -0.146514, 0.0416223]';
cam_up       = [-0.105006, 0.457485, -0.882996]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.146739, 1.1665, 0.621818]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;