AutoCAD Civil 3D Customization

[#1]

Hello!

Just marked one strange thing:

Our alignment starts at 3+00, ends at 43+00.   If we ask

 instantaneous radius in code:

 oAlignment.GetInstantaneousRadius(sta)

this function returns radius of aligment at station sta - its OK!

But! if we ask for Point at the same station sta: 

 oAlignment.GetPointAt(sta) 

it returns Point not at sta, but at (sta + oAlignment.StartingStation),

in our case - (sta+3.00).

If alignment starts at 0+00 - there is no such problem.

Is it bug or feature?

[#2 · Accepted solution]

There is no GetPointAt() method. There are GetPointAtDist() and GetPointAtParam(). These are both the base Curve object methods, therefor the the GetPointAtDist() uses an absolute distance since it has no knowledge of a Station. On the other hand, the GetInstantaneousRadius() method is an Alignmnetobject method which DOES expect the actual Station value.

So no, it's not a bug, but it something to be aware of and have code that compensates for it.

[#3]

Thank you Jeff_M for comprehensive reply!