Fusion 360 needs a CV curve for designers - seriously!

[cekuhnen]

Just a reminder to an old suggestion that Fusion 360 sketch really needs a CV curve so designers have better control

over the curves they create.

Splines are great as two point curves to create G1 or G2 blend curves but for sculpting smooth profiles it is a less

effective and efficient tool.

What is a click click done in Alias or Rhino is a painful adjust here adjust there adjust here adjust there and it still does not low well.

Here is a screencast showing how different the two curve tools work:

https://drive.google.com/file/d/0Byzv_NlyKp_2alRoREhjVmJab0U/view

In Fusion 360 the splines are really great to be used as blend curves but for sculpting as shown in the video they are really hard to manage.

[cekuhnen]

the spline handle is a great tool but not really the best in all cases.

take a look at this

two rings (2 segments) created and sculpted by CV edit

lofted together and changed surface into a different degree

moved and changed CV rings to sculpt the shape and finetuned the closeness

of CVs along a ring to define edgerounding and smoothness.

this was a piece of cake job in Alias.

in 3d sketch in Fusion this would be a nightmare but also with standard sketch planes with

individual cross-section sketches sculpting the same curve flow with spline fit points and spline handles is more

complicated.

so I think like for surfaces also CVs should be added to the spline tool in Fusion (Inventor has it)

[deyop]

There is work under way to provide CV editing.  

[Anonymous]

please add lattice deformation with cages.

[Anonymous]

I am trying to learn Fusion 360, but I am really missing the nurbs cv curves that I'm used to from other programs,  for me it's a lot faster to use and easier to manipulate  afterwards.
I saw this video where it is demonstrated the curve workflow in Alias Speedform, when can we expect to have that in Fusion 360 ? 🙂

Alias Speedform Design with Curve

https://www.youtube.com/watch?v=1oaf93FG3-I

[Anonymous]

What is the idea of having a "twin" program of Fusion 360 / Speedform ?
Wouldn't it make more sense to use all the energy and resources on one program ?

[roambotics_scott]

Oh wow that looks stupidly easy in Speedform.

@Anonymous I don't think it's intentional so much as Autodesk acquired Alias Systems and they're so big that they have a bunch of quasi-independent groups working in different directions on different things

[cekuhnen]

Speedform is really just for cars and speedform Alias can load.

They just borrow the T-S module from Fusion.

However I know that cv NURBS curves will come to Fusion sketches soon.

[colin.smith]

This should be in Fusion in the early half of this year. 

[michallach81]

From my perspective update on sketch is most urgent. CV curves, better constraints "managment" and in general better solver/engine.

On the other hand it's most fundamental piece, I would be surprised if developer would make it before finishing "Sheet Metal" or "Distribiuted Design".

[cekuhnen]

@michallach81 Whats wrong with the solver engine? My only problem is sometimes the speed because certain constraints slow the solver down significantly like mirror.

How do you want constraints be managed differently?

[michallach81]

In this thead:

http://forums.autodesk.com/t5/design-validate-document/splines-not-updating-to-changed-geometry-util...

I'm talking about disappearing coincident constraint. That happends not only in 3D but also in 2D (I don't have example now, but soonest I run into one, I'll post that). I've seen overconstraint warning numerous times, and couldn't debug it. We don't have all constraints shown (e.g. polyline). "Defined" indicator (black lines) is not percise, lines turn black, but happends that it still have some level of freedom.

Again, I don't have an example right now, but sketch solver sometimes gives akward resaults. Of course it depends on how sketch is constraint, but without relaible tool to determin is our sketch is fully defined, we can't work out decent workflow. I personally don't create a lot of parametric models (even if I work almost only in parametric mode), so I can live with less robust sketches, but If anyone will be working on sketches, should thing about those also.

[cekuhnen]

@michallach81 I just realized that yesterday I ran into the issue of not being able to horizontal constrain a line which made no sense.

so I deleted the line drew and a new one and then i was able to constrain it.

the error message was not very helpful and the design included 4 lines 😉

[21652157]

This features should be working long time ago. Unbelievable is not done now.

[TrippyLighting]

I believe there is a workaround that works similar to a CV spline.

You can apply a coincident constraint to the ennds of the spline handles and as such tie two handle ends together.

Then you can edit the spline like a CV spline.

It maybe a poor-mans version of a CV spline 😉

[cekuhnen]

@TrippyLighting I am not sure if I can follow your suggestion. Do you have a screenshot? But it also sounds pretty complicated or labor intensive.

[TrippyLighting]

I ve been able to do what I described in this screencast (2nd halsf), but I cannot repeat that in the newer updates of Fusion 360 as the splain goes alll haywire.

If this was intended functionality before it's broken now 😕

[cekuhnen]

@TrippyLighting You can still constraint the handle ends to each other.

But this is far from a CV curve.

With splines you cannot make a transition from a curve to a straight line another down side of them

it works pretty good for things like this: like s or c shape transitions

while it is not working ideal as well because as you can see the moment you add a smooth constraint the right curve start remains static

and will not adjust and thus adjust the blend spline shape like with a CV curve align or blend curve

and here in alias - the center curve always flows into the shapes of the two curves left and right

[scott.mayson]

The CV spline editing tools are implemented in to Speedform. So it should not be hard Autodesk to implement this into Fusion?

 

[Anonymous]

The spline tool is pretty much useless for making refined shapes.

One of the worst things is that if you are blending between curves, the blend will drive backwards into the curves you're blending.

If you lock those curves, the smooth constraint no longer works.

This is an important tool and it really needs a rethink. I don't want to have to make my curves in Illustrator or Alias or anything else in order to make the shapes I need.

[promm]

Claas,

Thank you for your idea, this is getting changed to future consideration.  We have a team on our solver side that is working on CV's.  Once they are done our sketch team will start work on implementing CV's.  At this point, the idea will be changed to accepted.

Cheers,

Mike Prom

Internal use FUS-11882 FUS-11881