AutoCAD Civil 3D General Discussion

AutoCAD Civil 3D General Discussion

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john.mckenzie
Posts: 222
Registered: ‎12-19-2006
Message 11 of 36 (357 Views)

Re: Delete Triangles vs adding Outer Boundary to eliminate them. Pros/Cons?

10-01-2013 08:30 AM in reply to: john.mckenzie

Then extract the boundary. use that linework to create a boundary FOR the original untouched surface.

 

 

 

This is to correct my garbage typing in previous post so that it is understandable. LOL

 

 

Valued Mentor
dmartin
Posts: 406
Registered: ‎04-09-2013
Message 12 of 36 (344 Views)

Re: Delete Triangles vs adding Outer Boundary to eliminate them. Pros/Cons?

10-01-2013 09:32 AM in reply to: john.mckenzie

If you share you surfaces via xml, it is imperative that you attach a boundary to the surface. If you simply delete lines and export the surface, when it is imported, it will connect points you do not want connected.

Thanks,
Dave

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antoniovinci
Posts: 1,681
Registered: ‎06-03-2011
Message 13 of 36 (319 Views)

Re: Delete Triangles vs adding Outer Boundary to eliminate them. Pros/Cons?

10-02-2013 05:29 AM in reply to: peterfunkautodesk

peterfunkautodesk wrote:

There is another tool that you could look at for the edge triangles: "Maximum angle between adjacent TIN Lines" .


That would sound great, Peter, but... please read the comment at the bottom of this post: what about it..?

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peterfunkautodesk
Posts: 719
Registered: ‎08-25-2009
Message 14 of 36 (307 Views)

Re: Delete Triangles vs adding Outer Boundary to eliminate them. Pros/Cons?

10-02-2013 06:50 AM in reply to: antoniovinci

Reasons for extracting the boundary and adding it back are two fold: to reduce the processing time and to make sure that no interior triangles are elimated.

 

Cheers,

 

Peter Funk

Autodesk, Inc.



Peter Funk
Autodesk, Inc.

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antoniovinci
Posts: 1,681
Registered: ‎06-03-2011
Message 15 of 36 (299 Views)

Re: Delete Triangles vs adding Outer Boundary to eliminate them. Pros/Cons?

10-02-2013 08:00 AM in reply to: peterfunkautodesk

peterfunkautodesk wrote:

extracting and adding it back.


Gotcha, sir.

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doni49
Posts: 1,738
Registered: ‎12-22-2012
Message 16 of 36 (285 Views)

Re: Delete Triangles vs adding Outer Boundary to eliminate them. Pros/Cons?

10-02-2013 11:21 AM in reply to: john.mckenzie

Thanks everyone!

 

This turned into a very informative and lively discussion.

Don Ireland



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troma
Posts: 2,520
Registered: ‎05-21-2008
Message 17 of 36 (277 Views)

Re: Delete Triangles vs adding Outer Boundary to eliminate them. Pros/Cons?

10-02-2013 11:35 AM in reply to: peterfunkautodesk

The blog that Antonio linked specifically says:

One thing also worth mentioning is that this action only assesses triangle lines that create outer boundary, so no interior triangles will be modified

 

But the comment at the bottom says:

I am a surveyor and have tried this maximum triangle angle function on surfaces if made and it looks at all triangles (internal or external) so if you have skinny triangles in the middle of the survey area it will create holes.

 

 

Can anyone elaborate on this apparent contradiction?

Thanks.


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peterfunkautodesk
Posts: 719
Registered: ‎08-25-2009
Message 18 of 36 (269 Views)

Re: Delete Triangles vs adding Outer Boundary to eliminate them. Pros/Cons?

10-02-2013 11:44 AM in reply to: troma

The workflow that we have been talking about is

 

1. make the surface from your data

2. turn on the max lenght/angle settings to reduce the triangles in the surface. This can remove interior and exterior triangles. I'll leave it to the others to comment on a surface that has very long or thin interior triangles. This is where the linked topic stops.

3. extract the boundary of the surface (with the edges cleaned up

4. Add this boundary back to the surface as an outer boundary.

5. turn OFF the max triangle length/angle settings. If you didn't do step 4, then the surface would revert back to the surface from step. With the addition of the boundary, the surface will be "clean" and any long/thin triangles on the interior will be displayed

 

 

 

Regards,

 

Peter Funk

Autodesk, Inc.



Peter Funk
Autodesk, Inc.

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troma
Posts: 2,520
Registered: ‎05-21-2008
Message 19 of 36 (260 Views)

Re: Delete Triangles vs adding Outer Boundary to eliminate them. Pros/Cons?

10-02-2013 11:51 AM in reply to: peterfunkautodesk
I already understood that. It sounds like a good method. I wasn't asking about that.

I was asking about the contradiction on the other site. I guess you're saying that you don't know?


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doni49
Posts: 1,738
Registered: ‎12-22-2012
Message 20 of 36 (253 Views)

Re: Delete Triangles vs adding Outer Boundary to eliminate them. Pros/Cons?

10-02-2013 11:54 AM in reply to: peterfunkautodesk

peterfunkautodesk wrote:

The workflow that we have been talking about is

 

1. make the surface from your data

2. turn on the max lenght/angle settings to reduce the triangles in the surface. This can remove interior and exterior triangles. I'll leave it to the others to comment on a surface that has very long or thin interior triangles. This is where the linked topic stops.

3. extract the boundary of the surface (with the edges cleaned up

4. Add this boundary back to the surface as an outer boundary.

5. turn OFF the max triangle length/angle settings. If you didn't do step 4, then the surface would revert back to the surface from step. With the addition of the boundary, the surface will be "clean" and any long/thin triangles on the interior will be displayed

 

 

 

Regards,

 

Peter Funk

Autodesk, Inc.


It sounds like the blog posting was incorrect (assuming the commenter and Peter are both correct).  Peter's comment above indicates that the setting CAN remove interior triangles.

Don Ireland



If a reply solves your issue, please remember to click on "Accept as Solution". This will help other users looking to solve a similar issue. Thank you.


Forum links:
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Civil 3D General
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