reverse Splines

It's more like max always draw the positive outline starting from the left of the spline as seen from vert1 to vert2 and when looking at the spline from the positive Z side.
Otherwise it couldn't outline a straight line, could it?

jimflim, your question doesn't make sense.
CW or CCW from which point of view? And even so, the verts can be anywhere in space. How about self-intersecting shapes, like an '8'? No matter how you look at it, part is CW and part CCW.

Now if you know that all the splines are lying flat in the xy plane AND they're seen from above AND they're not self-intersecting, you can write a script for this very particular case (one among an infinite number of other possibilities).
Look at the cross product. Take three consecutive verts - like 1,2 and 3 - and use cross (p3 - p2) (p1 - p2). Then look at the z component of the result. If it's positive, the spline is CCW. If it's negative, the spline is CW. If it's zero, try again with verts 2, 3 and 4.

Of course the verts can be anywhere in space but Max still stores a CW or CCW direction in each shape somewhere which makes the 'outline' function possible and tells max to outline to the outside and not to the inside of the spline, even if the points are located in 3D space.

from the mxs-help:

reverse <shape> <spline_index_integer>

--reverses the order of the knots in the indexed spline.

and to get direction measure 2 knot coords, for exmple 1st and 2nd.

yes I wrote about that function, but I need to know the state in which the spline lies. reversed or not.