Help! Surface loft error

[anton.soderlund_schulz.6265]

Hello, Im a student stuck on a surface loft.

I got the error/warning:

"Error: Cannot create surface from selected geometry.
Adjust the selection set.
Error: Cannot create tool body for loft."

This is only my second surface loft ever, so im correcting mistakes as I go (aligning points and such). But I can't figure out what the problem or solution is with this error.

The error appears when i select the rail, which by the way seems to be closed and connected to the profiles.

The other half works fine, so please please help me understand! Time is of the essence, huge thank you.

[anton.soderlund_schulz.6265]

By the way I just tried using a centerline and the error did not budge. Please help 🙂

[jeff_strater]

no one can help you without the design in question.  Export it and attach it to your next reply.  However, one comment I can make is:  you have way too many fit points in your splines.  No way of knowing whether that relates at all to the error you are seeing, though.

[anton.soderlund_schulz.6265]

Thanks alot for responding. Okay exported and attached, I hope it was the right format. About the points in the splines, I projected a silhouette of a component i creating a pocket for. Is there a quick way to simplify the spline?

[jeff_strater]

I took a different approach - instead of lofting one set of curves to the other, with one rail (which doesn't work , not sure why), I lofted from one set of curves to a point, with 3 rails:

(design attached)

But, that does not work with your design:

It will take me some time to explain all I did here.  The original design was messy.  Each profile had unnecessary lines in it, and as I said, too many control points.  It took some time to clean those up.  Look at my design in the meantime.  The resulting surface is not great - you'll want to clean that up as well.  But, the loft does succeed.

[jeff_strater · Accepted solution]

Here is a screencast showing what I did to one of the profile sketches to try to simplify it.  Repeat that on all the sketches involved.  You will have to be the judge of what is OK geometry, but in general, the fewer control points, the better.

[g-andresen]

Hi,

here is a simple example of creating a "clean" spline.

günther

[TrippyLighting]

I've gone through the timeline of your design and IMHO this is a complete redo from scratch starting with the first sketch in the timeline. It is not dimensioned and not properly constrained. It is also already overly complicated for the geometry you are creating. Fillets, for example, should not be part of that sketch.

[anton.soderlund_schulz.6265]

I solved it, thanks for the help.

[bryn.parrott]

Always we find error messages of this nature, that give absolutely no clue as to what the actual problem is.  Its now 2 years after this report, and yet I get it now too, so clearly Autodesk do not give it any priority to fix, but always we get new features nobody ever actually wants.

The useless error messages are by far the biggest impediment to productivity using Fusion.

[TrippyLighting]

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@bryn.parrott wrote:

Always we find error messages of this nature, that give absolutely no clue as to what the actual problem is.  Its now 2 years after this report, and yet I get it now too, so clearly Autodesk do not give it any priority to fix, but always we get new features nobody ever actually wants.

The useless error messages are by far the biggest impediment to productivity using Fusion.

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If you have specific problems, please open a new thread, post a model, and a detailed description of what you are trying to achieve and the problems you are encountering.

[bryn.parrott]

No, I will not be doing that.

The issue of incomprehensible error messages (in general) is well known, yet never addressed by Autodesk.

What needs to happen, at the very least, is in the case where it is unable to complete the requested function to highlight graphically the areas of the model giving it difficulty : graphically making it clearer to the user what is the next step to allow the action to complete successfully.
To improve further then the error message needs to be written using language that makes sense to the user. At present the language used makes sense only to the programmer that wrote the code.

[davebYYPCU]

What needs to happen, at the very least, is in the case where it is unable to complete the requested function to highlight graphically the areas of the model giving it difficulty : graphically making it clearer to the user what is the next step to allow the action to complete successfully.

So the upgrades performed for Loft Rail errors, (red blobs) - and yellow self intersection displays, are before your time?

There is / has been a continuing improvement commitment from Autodesk, in my time, admittedly more to do than they can handle.

[robinpowell46]

If you don't mind, how did you solve it?

[TrippyLighting]

This is an old thread that is marked as solved. If you have a specific problem, it is better to open a new thread and post the problem there, preferably including the model in question 😉 

[bryn.parrott]

I do not see those. I am using current version. I agree that if they had such functionality it would be useful.

[TrippyLighting]

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@bryn.parrott wrote:

I do not see those. I am using current version. I agree that if they had such functionality it would be useful.

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That functionality has existed for quite a while!

If you can share a particular case, please do so.

[bryn.parrott]

Well, whilst working yesterday I noticed that when performing a loft, an error message does appears (!!) , and black lines indicate problem areas. I lok at the items highlights and do not see what its complaining about.
Language language of the error message is obscure and technical, not comprehensible to mere humans, and I do wonder why Fusion cannot just resolve the issues automatically, or at least be more helpful.

[TrippyLighting]

What I meant with "If you can share a particular case, please do so." is that you would attach a model that exhibits the undesirable behavior in .f3d format. You could even post a screen recording.

For a software developer, your textual description is as obscure as the error message 😉

[TheCADWhisperer]

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@bryn.parrott wrote:

I do wonder why Fusion cannot just resolve the issues

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@bryn.parrott 

Can you File>Export your *.f3d file that exhibits issue to your local drive and then Attach it here to a Reply?