That's a very good question. I have no idea what that dimension is and I have no idea how to get those types of splines to work consistently or correctly. I have seen in newer releases they have a better "style spline" that doesn't have all those handles that always get messed up for me. You may have a look at that type of spline and see if it works for you.

Please take the advice of Todd Blacksher and use style splines, you will save yourself a lot of trouble. I am not even sure how you would fully define a regular spline. Just to give you an example, I used a regular spline to define a parabola for a project and one of those handles got inadvertently moved and it threw everything else off. Guess how long it took me to catch that...

You can do that. And honestly I don't know the parameters of your assignment. However, most of the users on these forums probably would dissuade you from using that tool. You will end up with a very messy sketch with dimensions all over the place.

I would be curious as to what guidance J. Mather would have about this. He teaches SW, I just use it.

I do not have access to SWx at the moment to give a more complete description or example, but you can think of that magnitude as a "weighted influence of tangency". The larger the magnitude-the flatter the curve at that node.

You can also.... got to run, back in a bit.

The weight is a unitless value.

You can dimension the locaton of the node, the weights of the handles, the angles of the handles relative to some other geometry or use horizontal or vertical or colinear relatons.

magnitude is the total length regardless of which direction.