Rotate or Sweep using custom curve

[cpm64]

Hello,

I'm struggling to create a solid using a custom spline path. 

As a beginner I thought revolve can solve my problem - however it is not supporting custom curves. 

I tried to use

-  Sweep, but the result is somehow strange, with some 'artifacts' below the horizontal plane

- Loft

Any idea how can I achieve this?

Thank you.

[g-andresen]

Hi,

Please show a picture of a real existing object.

günther

[cpm64]

Thanks, here it is (a crop of the original, Copyright Dr2005).

. The object is a railcar roof, In the render below is 'swept' about 35 degree but it has the issues I presented above.

[barry9UDQ6]

How about patch with guide rails?

[jeff_strater]

I think I would probably try to model the whole thing (rail car) as a solid Loft.  Is there a reason why you are looking at only the roof here?

[TrippyLighting]

Before you start lofting anything, perhaps it would be a good idea to fully constrain and dimension your 2 sketches.

If this is symmetric. the axis of symmetry should align with the (sketch) origin.

Then, make sure to fix any yellow or red icons as son as the warning appears. 

[TrippyLighting]

Is this similar to what you are looking for ?

[cpm64]

Yes, this is it.

I tried a different approach than in initial post, but is time consuming as I need to pay attention to the scaling proportions.Lofted between 2 planes, joined, choose the next 2 planes then loft and so on, very annoying at the side when I needed extra rails to keep the rounded profile.

Here is the result. 

If there is a better approach, would you mind to share it?

Regards,

CPM

[TrippyLighting]

---

@cpm64 wrote:

Yes, this is it.

I tried a different approach than in initial post, but is time consuming as I need to pay attention to the scaling proportions.Lofted between 2 planes, joined, choose the next 2 planes then loft and so on, very annoying at the side when I needed extra rails to keep the rounded profile.

Here is the result. 

If there is a better approach, would you mind to share it?

Regards,

CPM

1 sweep, one loft, 2 fillets. No need to loft these small sections.

[cpm64]

Next, fillet to be tested, the curvature must be the same as the one from the box drawing, this is why I wanted to use the box (car body) horizontal plan projection as the roof base shape and revolve it along the spline.