Lofting to obtain 3D solid

[Hrcko]

I can't obtain 3D solid using "Loft" command. Here is the message:

 

The selected entities are not valid.

 

Peta krmene statve 2014-04-30.dwg

 

I checked if the sections are closed. What could be the reason for "not valid" entities?

 

Thank you for the help.

 

Regards,

Hrcko

[ReMark]

Could it be that each of your profiles do not consist of a single, continuous polyline?

[ReMark]

Reproducing just your first and last profiles using a 3DPolyline then lofting resulted in this solid.

 

Some of your geometry is, how shall I say this, not too well constructed.

[ReMark]

You used a combination of lines and 3Dpolylines to create your profiles as you can see in the image above. Each profile is not continuous.

 

BTW...if you loft two lines you'll end up with a surface not a solid.

[Hrcko]

Thank you ReMark!

Each cross section is made by two 3D polylines and one line.

Thank you for your answer.

[ReMark]

Well now that you know the problem you can fix it. When you are done post an image of the final 3D model.

 

You're entirely welcomed.

[Hrcko]

Thank you ReMark, now I will take some time to investigate the problem.

[ReMark]

There is nothing really to investigate. Using the 3Dpoly command trace over each of your existing profiles. Do this on a different layer (using a different color) and lock the layer the existing profiles are on while you work. The whole process should only take a couple of minutes.

[Hrcko]

I have 9 frames, the first one iz slant and I could not include it in lofting. The idea was to include all 9 frames.

 

 

 

I have not complete solid. What could be the best solution?

[ReMark]

It Should have worked. I am not on my CAD computer so I can't work on the problem at the moment.

[Hrcko]

I got the message: "First and last cross sections must be planar." The first one is not correct.

[ReMark]

In my first post I used the first and last profiles for lofting with no problem. As mentioned previously I also redrew both using a 3D polyline.

[JD Mather]

I have 9 frames, the first one iz slant and I could not include it in lofting.

 

Normally the best loft would be with 2 profiles and 4 guide curves in for something like this.

Since your first and second profile are significantly different I might include both of those for a total of three in this case, but certainly not 9.

[Hrcko]

When I defined the first frame with four points (in corners) it works fine.

 

Thank you for the help.

[Hrcko]

Peta krmene statve 2014-05-01.dwg

 

I want to loft using three profiles and four guide lines. Two of these four lines are curved. Is it possible to loft using these guide lines?

 

 

The second part with curved guides makes me the problem.

 

Regards,

Hrcko

[SEANT]

Discontinuities (non-smooth transitions) will be a problem with any single application loft attempt. Based on some of the construction geometry in your file there seems to be a design intent that places importance on smooth sides – something not as apparent in the image.

 

If that is the case I’d be inclined to use lofts to generate surfaces for slicing a solid. See example.

Peta_Mod.dwg

[Hrcko]

Thank you Seant!