cam_pos      = [-0.53093, 1.30258, 1.73758]';
cam_dir      = [0.981171, 0.166953, -0.0971087]';
cam_up       = [-0.151792, 0.977452, 0.146786]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.158837, 0.171945, -1.30924]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;