topic Re: Lofting a corner in Fusion Design, Validate & Document Forum

Lofting a corner

Anonymous — Fri, 14 Jul 2017 12:00:02 GMT

Hello,

Does anyone have any idea on how to loft this corner?

It seems simple and straight forward. What am I doing wrong here?
I have used similar functions in other software without issue, Any idea on how to loft this correctly?
Or a different process to achieve a nice capped corner?

Cheers

Re: Lofting a corner

HughesTooling — Fri, 14 Jul 2017 16:57:38 GMT

You need a single rail curve, can you chain select where you have 3 rails. And as I asked in your other post, can you export your f3d file and attach?

Re: Lofting a corner

cekuhnen — Fri, 14 Jul 2017 19:16:46 GMT

@HughesTooling@Anonymous

I would loft to a point by using the sides as rails

Re: Lofting a corner

SaeedHamza — Sat, 15 Jul 2017 15:23:21 GMT

Hi,

Please try this method with a sweep, worked for me so I hope it will work for you as well

Regards

Saeed

Re: Lofting a corner

SaeedHamza — Sat, 15 Jul 2017 15:32:41 GMT

Forgot the screencast ...

Re: Lofting a corner

cekuhnen — Sat, 15 Jul 2017 16:25:15 GMT

@SaeedHamza

In this case Sweep visually looks fine but only because we deal with an arc fillet and tangent planes!

With G2 fillets this fails - just be aware of it

Re: Lofting a corner

SaeedHamza — Sat, 15 Jul 2017 16:28:02 GMT

Yes, it's not functional, I just thought it might work for this issue, although loft should solve this

Re: Lofting a corner

cekuhnen — Sat, 15 Jul 2017 16:35:18 GMT

@SaeedHamza @Anonymous @HughesTooling

Actually not at the moment. Loft lacks the tools for it when dealing with G2 or non circular geometry.

Mainly the G1 G2 option for rails are missing - but should be added soon.

https://drive.google.com/file/d/0Byzv_NlyKp_2Nm9lSVBkeWR0Qkk/view

Re: Lofting a corner

SaeedHamza — Sat, 15 Jul 2017 16:38:13 GMT

It's tricky even to notice it when using loft

Although it works

Re: Lofting a corner

HughesTooling — Sat, 15 Jul 2017 16:49:03 GMT

All poking in the dark without the OPs model. All his edges are made from 3 curves, assuming it's 2 lines and an arc there could be problems if the lines are not tangent to the arc.

Mark

Edit One edge has 4 curves, I think that puts a sharp corner in there unless the 2 top faces are coplanar. Not sure how loft will deal with that.

Re: Lofting a corner

SaeedHamza — Sat, 15 Jul 2017 16:42:39 GMT

by the way, extruding then lofting seems to work just fine, don't you think?

Re: Lofting a corner

SaeedHamza — Sat, 15 Jul 2017 16:44:16 GMT

Yes, having the model always reduces the effort of finding the answer, but most of the people posting in forums make us ask for it

Re: Lofting a corner

Anonymous — Sat, 15 Jul 2017 17:33:44 GMT

Thank you everyone for your replies. As SaeedHamza has said a sweep would be nice but with this complex model it doesn't work. Loft seems to be my only option but I cannot get it to work.
cekuhnen you mentioned lofting to a point and using the sides as rails, I have no idea how to do that?

I have attached the model as everyone has requested it.

Cheers

Re: Lofting a corner

cekuhnen — Sat, 15 Jul 2017 18:02:49 GMT

@Anonymous

how did you build that solid model

this one is going to be a pain to fix/repair.

Re: Lofting a corner

Anonymous — Sat, 15 Jul 2017 18:04:49 GMT

Its an imported model from a client... My thoughts exactly

Re: Lofting a corner

cekuhnen — Sat, 15 Jul 2017 18:23:30 GMT

can be that through exports the original data got lost or changed but this is a total mess

rebuilding will be faster - however to be honest I think Fusion currently is not able to do this sufficiently.

their tools are more focused on easy simple geometry and not something like this which has uneven sides

regarding loft to a point:

https://drive.google.com/file/d/0Byzv_NlyKp_2MGxSZ0tIV1NLZGc/view

Re: Lofting a corner

Anonymous — Sat, 15 Jul 2017 18:33:45 GMT

Woah how did you get that view? of all of the disjointed surfaces?

Thanks for the tips on point loft

Re: Lofting a corner

SaeedHamza — Sat, 15 Jul 2017 18:49:26 GMT

You're beyond helping my friend, this model is really messed up ...

Nothing accurate to use ... I think that the patch is the best thing to do with all this, other than that forget it

I recommend you as @cekuhnen said above to rebuild the model, it will be a lot faster for you and your client

Re: Lofting a corner

laughingcreek — Sat, 15 Jul 2017 23:02:09 GMT

this one is challenging. This is my quick stab. couldn't get both sides of loft to have a tangency connection because they come together at a point at the top. always a self intersection problem in that situation. There are approaches to fix that. As the others mentioned, the input geometry is already a mess, so this may be good enough?

Re: Lofting a corner

cekuhnen — Sun, 16 Jul 2017 00:55:25 GMT

@Anonymous

I exported the design as STEP to open it in MOI which is a cheap Rhino clone and a basic NURBS modeler (pretty easy to use and quite powerful).

The colored edges are the raw surfaces. I untrimmed all the details to see how the design was constructed to see if there is something I can do with

it but the parts are such a mess ...

Also I took another try on the model and cannot build it with a surface perfection I expect. The geometry is pretty crazy.

So my question is how far can you rebuild and clean it up for your client? Fusion 100% lacks the ability to do what you want.

However the data the client gave you is also plan crazy

There are plenty of inaccuracies - lazy edges, edges that have sharp and not smooth transitions and such.

If you can adjust those then this model can be rebuild much easier in Fusion.