AutoCAD Civil 3D General

Reply
Mentor
Posts: 222
Registered: ‎12-19-2006
Message 11 of 36 (254 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
Posts: 402
Registered: ‎04-09-2013
Message 12 of 36 (241 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

Civil 3D 2013
HP Z400 Workstation
6GB of RAM
296GB HDD
ATI FirePro V5700(FireGL)
Win 7 Home Professional
Please use Kudos Where Deserved



*Expert Elite*
antoniovinci
Posts: 1,493
Registered: ‎06-03-2011
Message 13 of 36 (216 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..?

Employee
Posts: 707
Registered: ‎08-25-2009
Message 14 of 36 (204 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.

*Expert Elite*
antoniovinci
Posts: 1,493
Registered: ‎06-03-2011
Message 15 of 36 (196 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.

*Expert Elite*
doni49
Posts: 1,066
Registered: ‎12-22-2012
Message 16 of 36 (182 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



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.
*Expert Elite*
Posts: 2,501
Registered: ‎05-21-2008
Message 17 of 36 (174 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.


Credit where credit is due! Give kudos or accept as solution whenever you can.

Employee
Posts: 707
Registered: ‎08-25-2009
Message 18 of 36 (166 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.

*Expert Elite*
Posts: 2,501
Registered: ‎05-21-2008
Message 19 of 36 (157 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?


Credit where credit is due! Give kudos or accept as solution whenever you can.

*Expert Elite*
doni49
Posts: 1,066
Registered: ‎12-22-2012
Message 20 of 36 (150 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.

You are not logged in.

Log into access your profile, ask and answer questions, share ideas and more. Haven't signed up yet? Register

Announcements
Welcome to the new Autodesk Community!
If this is your first visit, click here to get started and make the most of the Community. Let us know what you think of the new experience in the Community Feedback Forum.

Need installation help?

Start with some of our most frequented solutions to get help installing your software.

Ask the Community


Civil 3D Exchange Apps

Created by the community for the community, Autodesk Exchange Apps for AutoCAD Civil 3D helps you achieve greater speed, accuracy, and automation from concept to manufacturing.

Connect with Civil 3D

Twitter

Facebook

Blogs