cam_pos      = [0.69838, 1.64486, 0.327699]';
cam_dir      = [-0.342546, -0.337319, -0.876857]';
cam_up       = [-0.00311672, 0.933725, -0.357978]';
cam_lookat   = [0, 0, 1]';
cam_sky      = [0, 1, 0]';
cam_right    = [-1.24953, 0.159455, 0.42679]';
cam_fpoint   = [0, 0, 1]';
cam_angle    = 90;