cam_pos      = [0.48514, 1.50925, 0.316368]';
cam_dir      = [-0.582511, 0.447225, -0.678728]';
cam_up       = [0.673089, 0.73352, -0.0943433]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.606038, 0.680694, 0.968646]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;