cam_pos      = [-0.371735, 1.16101, -0.679809]';
cam_dir      = [-0.639364, -0.0113729, 0.76882]';
cam_up       = [0.116984, 0.986811, 0.111883]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [1.01074, -0.21476, 0.837369]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;