Possible BUG ? Polyline to feature line interpolates wrong data

[tonnot]

I think I have a bug.

I have created a feture line from a 2d polyline. 

I have NO weed appplied and as you can see there are two errors :

- some points on original surface (used to get Z) are not interpolated.

- the quick profile shows error : in addition to lacking points, others are bad interpolated.

(the image show both)

The surface used behaves rightly with feature lines created from aligments 

(I have created an aligment from polyline and then a fetaure line from that and the Z interpolation are ok )

Do you experiment something similar ? Thanks

[Alfred.NESWADBA]

Hi,

until now I have not seen anything like that. The idea I have to your situation is that the original polyline might be not cleaned, what means either multiple vertizes at the same position or segments in the polyline that overlap (like you drawed from point 1 to 2 to 3 back to 2 and then again 3 ....).

Can we have the drawing to play?

- alfred -

[tonnot]

I think the problem is that the original polyline have colinear points one after other.

Sure, I have check it. It is a bug.

You can try with a simple polyline with 5 points created using ortho (horizontal , or vertical or post-rotated ) and you will see the error.

Can you confirm it ? Thanks

[Alfred.NESWADBA]

Hi,

>> Can you confirm it ?

Uiihhh, confirmed with C3D 2014. And the blue one in my screenshot is really strange, what Z-values it got.

- alfred -

[neilyj666]

Seems ok to me

[tonnot]

But please... can you use a "silly" polyline with colinear points ( every 3 meters) converted to 

(I dont know if you are using this - colinear points...) 

 i'm going to test it on other TIN.

Thanks.

[neilyj666]

Created a Pline with 2.5m vertices (and offset left and right for demo purposes)

Creted an FL with levels assigned DURING creation - vertices all over the place

Created and FL with Levels assigned AFTER creation - looks ok to me

[Alfred.NESWADBA]

Hi,

>> Created and FL with Levels assigned AFTER creation - looks ok to me

Yep, that way looks also good for me. So congratulation for finding a workaround!

@Autodesk: the first way (to assign heights from surface during creation of the feature line) should work better 😉

- alfred -

[neilyj666]

I'm sure there were issues (crashes or hanging) in previous versions (2011/2012?) when assigning levels during creation and I've never used this method since.....

[Alfred.NESWADBA]

Hi,

>> there were issues [...] when assigning levels during creation

Interesting, I always did it that way with just one restriction: making sure the polyline is clean before converting it to a featureline.

- alfred -

[jmayo-EE]

I don't think I am following the procedure to get the defect.

I drew a pline. Used the Add VErticies command to get PI's @ 25'. Created FLine from object and assigned elevations. All the PI's hit the surface. Now I would have to check the Add Intermediate Verticies button to get the FLine entirely on the surface but the rest looks good (magenta).

I then traced over that pline to create the colinear PI's in the Pline command. Converted to FLine, Assigned elvations and it also looks good (blue).

[jmayo-EE]

Here's the two line image.

[troma]

Personally never had an issue assigning elevations during creation.

Just tested in Civil 3D 2011, 32 bit.

Fisrt time I did it without "Erase existing entities", then I did it with.  Both times ran a quick profile of the featureline & surface, and it's bang on.  (I used  Add Intermediate Verticies button.)

[tonnot]

So ... finally we have a bug or not .....????

"Civil 3D method to give intermediate elevations for FL creation fails on those segments with colinear points"

Method A : create FL giving intermediate elevation points fails.

Method B:  create FL without elevation assign and after use the tool to get elevetion & intermediate points : OK.

Yes ? 

(Image : Method B for 1 and 4 : Ok , method A for 2 and 3 : Bad )

[troma]

What version are you in? I tested in 2011 and it was OK both ways, no bug.

[tonnot]

Pure 2013 

[jmayo-EE]

I do have the issue in 2014. Intermediate veticies are not on the surface when applying them upon creation. This is the second go around for this issue. As I recall we had it in 08 or 09??

This should be reported to the support folks. Please let us know if you plan to do so.

[jmayo-EE]

Sorry I need to take back that statement. I DO NOT have the issue in 2014. I had the wrong surface profile to compare the projected Fline too. I will try to check in 2013.

[Alfred.NESWADBA]

Hi,

>> Sorry I need to take back that statement. I DO NOT have the issue in 2014

I have that issue in 2014 German (when using surface-height while creation of the feature line)

- alfred -

[neilyj666]

As I could reproduce the issue, I raised a support request with a link to this thread