cam_pos      = [1.00232, 1.78991, 1.27157]';
cam_dir      = [-0.289136, 0.0897335, -0.953073]';
cam_up       = [-0.354302, 0.914866, 0.193622]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.18278, -0.523566, 0.309528]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;