cam_pos      = [0.633853, 1.64984, 0.335253]';
cam_dir      = [0.0572255, -0.160569, -0.985364]';
cam_up       = [0.0551666, 0.985982, -0.157466]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.32579, 0.0603131, -0.0868243]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;