cam_pos      = [0.0106171, 1.51212, 1.55744]';
cam_dir      = [-0.988482, 0.0152901, -0.150563]';
cam_up       = [0.111715, 0.744865, -0.657796]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.135781, 0.887163, 0.981532]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;