What are the recommendations for creating an assembly for export to 3D Solid?

[durasovartyom]

Good days!

What are the recommendations for creating an assembly so that the corridor can be exported to 3D Solid without any distortion?

I’m creating an assembly between two Surface Links. However, my 3D solid is twisting.
How should I modify the assembly to prevent this from happening?

[igi_pop]

Hello!

The file you sent us, and the pkt, works fine and the solid is fine.

And, it's different from what one of your screenshots display.

What dit you model there? Or better, how did you do it? Which subassembly?

Iggy

[durasovartyom]

Hello!

Thank you for your reply.
At first glance, it looks fine to me too,
but if you look closely, you can spot areas where the thread is twisted.

And here’s an example from the working file.
The situation there is even worse.

[igi_pop]

Hey,

I've looked into it, your chamfers are throwing it off. If you were to build it..consider this, just poped in my head, create a 90° rectangle, and your overhangin' bit with two chamfers (top and bottom) as a separate shape in the same PKT, tied in on the side. Also, if there's no specific need, you can ditch the side-mid points completly.

I can't try it out now, just got some work (yaay), but if you're willing - let us know 🙂

Iggy

[durasovartyom]

My initial assembly looked like this.
I explored how to create a rectangular shape between two surfaces. But I didn’t want the 3D Solid to throw an error.

If you apply it to a complex surface, you’ll see that it also becomes distorted.

[igi_pop]

There is something weird going on with this DWG...I'm not saying cause of the model, i think that with this kind of assembly we'll never get a straight model. But it keeps crashing on me 😕

I've tried a different approach.

you have all your alignments. All that is missing is:

• create surface profiles at the offsets
• create an assembly, add "LinkWidthAndSlope"
• set the profile to Surface1 (any actualy, but then you extract to the other one)
• set the offset targets - left and right, respectively
• set the elevation targets - left and right offset profile of the surface used as baseline vertical profile
• create a corridor surface (I've set the style to triang)
• select the surface -> extract from surface -> extract solids from surface
• set the menu as in the first screenshot

enjoy 🙂

Iggy

 

 

[durasovartyom]

Thanks!
I knew that. It was easy.
But I’d like to get it out of the corridor

[igi_pop]

This is out of the corridor as well, just a bit help from the outside 🙂

The nature of triangulation is such that you'll have a hard time trying, and ultimately fail I'm afraid.

This is a easy setup with two identical surfaces, and it's not working as one would like/expect it to work. It's an irregular profile, targeting something irregular. I think the system cannot compute, and does not have such options to normalize it.

A good tip for a no-go would be the fact that you cannot extract swept solids.

Good luck,

Iggy

[essam-salah]

i haven't downloaded the files you've posted, but first increase corridor frequencies and everything will be changed.

[cwr001]

There are no errors on your part.
Solid extraction from surface links didn't work at all a couple of releases ago until Autodesk proudly announced that it's a feature now.
Their implementation sucks though and while you might get a somewhat satisfying solid for the most basic of situations, it's not reliable at all and produces the distorted results you are experiencing.
There's nothing you can do really - the only option I've found is to turn away from surface links altogether. One alternative approach is to calculate "intermediate points" between the outermost points and form the shape that way.

[gleonhardt]

Hello,

by my expiriance the twister in the solid based on the behavior that internaly the points with the same number in PKT are connected.

In the German Country Kit is a variable curb, where you can switch between curb with rounding and curb with chamfer. On the chemfer I have defined points of the straight line. The point numbers of starting and ending the chamfer have the numbers like from the rounding. 

So I get a perfect solid from corridor.

Best regards

Gerald

[cwr001]

Those DACH-curbs are nice in the sense that they keep the number of points consistent regardless of chamfer or rounding - they do not have any interaction with a surface though. 
@durasovartyom is specifically asking about Surface Links and those are just outright broken when one is trying to extract sensible corridor solids. It's unfortunate, but that is the state of the software -it has nothing to do with incorrect usage (at least to my knowledge and I'd love to be proven incorrect).

[lauri_barnhart]

Hello @durasovartyom, thanks for posting in the community!

Did the information provided by igi_pop or essam-salah help?

If yes, please mark the reply as the accepted solution.

This helps other users benefit from the shared solution.

If the issue persists, let us know with an update so we can assist further.

Regards,

[durasovartyom]

Good day!

@lauri_barnhart 

The issue has not been resolved.
Oh, how wonderful that you'll be able to help us all with this!
As mentioned above, we need to involve your Civil 3D and Subassembly Composer for Civil 3D development team.
Please bring this issue to their attention.
If you need our help in any way, let us know. We’ll get back to you right away to let you know how we can assist them.