cam_pos      = [0.177607, 1.68554, 1.92712]';
cam_dir      = [0.738461, -0.328318, -0.588967]';
cam_up       = [0.0596114, 0.901822, -0.427976]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.893302, -0.373642, -0.911758]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;