topic Re: Creating a three-point circle from survey points - Linework Code Sets in Civil 3D Forum

Creating a three-point circle from survey points - Linework Code Sets

ppereira7H9TH — Tue, 12 Jan 2021 14:27:31 GMT

I'm fairly new to civil 3d, and I'm trying to figure it out what codes I should use in my survey data to create a three-point circle. Whenever I try using the circle code, I get an error message saying that Circle command failed , and no linework is created. If I use only the curve codes, I end up with a semi-circle closed, or not, with a straight line.

Here's the codes I've tried:

CIR / CIR / CIR

BCV CIR / CIR / ECV CIR

BEG CIR / CIR / END CIR

BCV / OC / ECV CLS

Do I always have to input the diameter of the circle in the code line?

Thanks!

Re: Creating a three-point circle from survey points - Linework Code Sets

Todd_Rogers — Tue, 12 Jan 2021 14:58:16 GMT

This should help...

https://knowledge.autodesk.com/support/civil-3d/learn-explore/caas/CloudHelp/cloudhelp/2019/ENU/Civil3D-UserGuide/files/GUID-AC1539C1-3526-43E4-A99B-2957947A7E73-htm.html

Re: Creating a three-point circle from survey points - Linework Code Sets

ppereira7H9TH — Tue, 12 Jan 2021 15:02:49 GMT

Hi Todd,

Thank you for the reply. But in this link it only says what I knew already "...The two and three-point circles behave like begin commands to create a new figure and end an active feature with the same name.... ...Method 3 uses three points to define a circular figure. The elevation of all three points is used and continues the closure with an arc instead of a line." What I can interpret here is that it'd work if I used the code CIR for my three points, but when I do that I get a failed message.

Re: Creating a three-point circle from survey points - Linework Code Sets

tcorey — Tue, 12 Jan 2021 15:39:44 GMT

I wish the FieldBook guide would show an example of "Method 3."

Re: Creating a three-point circle from survey points - Linework Code Sets

rl_jackson — Tue, 12 Jan 2021 17:46:49 GMT

To create a circle from three points:

You take a shot, for example I have a figure code for WW which stands for Wet Well (Pump Station), and use automatic line work so I don't need the B or BEG

Desc first shot: WW1

Desc second shot: WW1

Desc third shot: WW1 CIR

Re: Creating a three-point circle from survey points - Linework Code Sets

ppereira7H9TH — Tue, 12 Jan 2021 20:50:51 GMT

Hi @rl_jackson ,

Thank you for your reply. I tried using the CIR code only in the last survey point like you suggested, and it only works for certain points, but not all. I thought that maybe it could be the figure prefix configuration or something, but using two different manholes, one works (first picture, MH works, CON doesn't), and the second one doesn't work (second picture of MH points). Do you have any idea why that would happen? I just receive a Circle Command Failed notice but nothing to further let me know why it failed.

Thanks!

Re: Creating a three-point circle from survey points - Linework Code Sets

rl_jackson — Tue, 12 Jan 2021 21:41:28 GMT

I'm thinking that if you have those two manholes in the same drawing you'll need to have the numeric, i.e. MH1 MH2 MH3 etc...... Then it should work, I would think the same would be true with the CON as well. Personally I always have the field start coding with WW1 WW2 etc.... when there doing location. Otherwise usually a failure means it could not solve a solution for the circle.

Re: Creating a three-point circle from survey points - Linework Code Sets

ppereira7H9TH — Wed, 13 Jan 2021 12:57:59 GMT

Hey @rl_jackson, I made it work. What you said about numbering all the points was very helpful, but one thing that I noticed is that I had to include CIR in my first point of each circle, and not the third.

I appreciate your help here!