cam_pos      = [0.20548, 1.04976, 0.634486]';
cam_dir      = [0.568983, 0.411289, -0.712109]';
cam_up       = [-0.820135, 0.34731, -0.454702]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-0.0802107, -1.12085, -0.711452]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;