Fusion
In this sketch, add a construction line between the first and last control points, then add a coincident between the beginning (ending) point and the construction line. That should do it for you. You would probably have better control using a Fit Point Spline.
John Hackney, Retired
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Why do you not try it for yourself? Because of the Coincident constrain, the beginning ending points cannot leave the construction line. You also could simply add a Parallel constrain between the first and last control point construction lines and not even sketch an extra one. The same is true for a fit point spline. The beginning and ending points automatically have an instantaneous tangent.
John Hackney, Retired
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Unless you get lucky, when you sketch a Control Point Spline, you will not get the same "instantaneous tangency" you get at the beginning, ending points of a Fit Point Spline without adding some sketch constraints to the beginning and ending control points. So if you have to have this condition, you will have to use the Fit Point Spline. The handles of a Fit Point Spline give you good control if you use them correctly. They will accept sketch constraints and dimensions to influence the spline.
John Hackney, Retired
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You do have an option of right clicking on the Control Point Spline and adding a control point very close to the beginning, ending point to achieve a close "instantaneous tangency" that will still allow you to move the other control points as needed.
John Hackney, Retired
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can't you just make the start and end control construction lines colinear? Doesn't that do the trick?
Jeff Strater
Engineering Director
Technically, yes, but as stated above locking those two lines together (be it parallel or co-linear) now takes away the ability to manually move each point individually to control the shape which is the entire point of using a spline to create an organic shape, which in my case, is something I would like to have complete control over. The point is to keep free-form control of the spline, not lock aspects of it down and attempt to work around that constraint.
This is what I would expect when ending the spline on the start point, just like the other spline tool does.
