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I seem to remember the constraint solver in Inventor is licenced from someone else (D-Cubed from Siemens) and the one in Fusion is Autodesk's own. I guess we're the beta testers and if the one in Fusion gets good enough it will end up in Inventor.
I was thinking more about the inability to add tangent and perpendicular constraints to a spline. There was a thread where @jeff_strater explained a bit about why.
Ah I thought that was added.. definitely harder (and likely to go badly with timeline modifications). If you can't do one, it's reasonable not to be able to do both (though for cubic splines, you don't even need to use numeric methods)
For a cubic spline, if X̲(𝝀) is the vector position for a cubic spline, and Ẋ̲(𝝀) is the vector derivative, the tangent direction is just
As long as you know the value of 𝝀 for a given position on the parameterised spline, you can literally just write down the tangent (and through a tiny bit of geometry or linear algebra the normal) directions, so with no work, you'd have both lines
Note: using vertical vector notation, where an underbar is a vector X̲, that consists of x, and y coordinates above and below, and the over-dot Ẋ̲ is just the first derivative of X̲(𝝀) with respect to 𝝀
Interesting that Inventor can do perpendicular to arc and Solidworks cannot. I suppose you could make the argument that for an arc it's the same thing as making the line coincident with the center, but why not still allow for perpendicular? It works with splines.
There are workarounds that require you to constrain to the tangent handles. This request would automate the workflow, what is your perspective on the priority of this versus CV splines?
I don't do much in the way of curves in sketches, but I would agree with @cekuhnen that CV splines are more important than perpendicular constraints to arcs/splines.
This has been requested quite a few times. The workaround for now is to add a coincident constraint, select the line then the arc centre. Unfortunately there's no workaround for splines, you can't even add a tangent to a spline.
