Odd result in Section.

[EvylRat]

I have created a TSD file here; and when you query it, the spot heights are between 4m and 6m. I've opened the TSD and I'm sure I've confirmed this. However, there is a very big lump in my sections, as if a decimal point has been dropped during the calculation, there is a 53 m spike in the sections. This is not shown on the contour map, nor when plotting the triangles.

Not a problem, I just remove the rogue point on the section.

But now I'm curious as to whether it will affect volume calculations.

CADTools v.1.1.699

[Lars]

Hi!

Volumes are calculated between triangles (prismoids) so there wouldn’t be any wrong. I assume you are talking about "Surface Cross section", it would be great if you could provide me with a DWG containing your alignment and a note on what station the problem occurs. That would make it easy for me to recreate your problem and examine what's going on behind in the code. The "Surface Cross Section" command works like draping a line onto a surface.

/Lars

[EvylRat]

No problem, DWG attached, TSD as per first post.

The contours don't show the issue, the 3d faces don't show it, but there's a huge spike on the section.

[Lars]

Thanks’ for the file! It seems to be some problem with the triangles. I don’t know if you have manipulated the surface triangles after triangulation or if CadTools have problems  with your data.

However, You need to provide better data for the triangulation or edit triangles (overlapping triangles). I’ve added some notes in the DWG you provided.


/Lars

[EvylRat]

No modification was made, so something must be messing with the creation of triangles. Thanks!

[Lars]

Yes! This kind of problem can occur if there are crossing breaklines. Breaklines can't cross in reality and therefore they mess up any calculation.

Did you use breaklines?

[EvylRat]

Lots and lots of breaklines! Ah, I just realised where I have two crossing breaklines. I knew I should have resolved it, they occur in all my models. Thanks!