How to change circular Alignment start point

[Beka_Tchigladze]

Hello 

I want to change start point of circular alignment which I create from alignment creation tool it always creates circular alignment from one point and does not gives me opportunity to assign start point.

here is a screen shot it always make start point on point 1 I want to start circular alignment on point 2 how to change starting point?

[Anonymous]

@Beka_Tchigladze  can you not change the start point in alignment properties?

If you select the alignment and go to alignment properties, 'station control' tab. You should be able to change the reference point by clicking the arrow to the right of the XY coordinates. Please only do this on a new alignment though as changing this can mess up profiles, corridors, links and pretty much anything that references the alignment.

Regards,

Peter

[Joe-Bouza]

use the station control tab of alignment properties. you can pick anywhere along the alignment to start

[Beka_Tchigladze]

@Joe-Bouza @Anonymous 

Thank you for your response I tried it but start station is minus something after that and i want to be absolute zero after change my reference is it possible?

i want to start chanage from zero there is written minus something down on the screenshot

[Joe-Bouza]

I just did it with station control

[Beka_Tchigladze]

did you get start station 0 ?

[Joe-Bouza]

Hello @Beka_Tchigladze

if you start with 0+00 you cannot avoid a negative station. Use a larger number for start station values. It is not unusual for alignments to begin with 1+00, 10+00, 100+00, specifically to avoid a negative when the inevitable change has to take place. 

https://autode.sk/2XLa0To

[Joe-Bouza]

the alignment is only a ruler, the numbers are only relevant for reference. if you must have 0+00 as the start you will have to define the alignment differently. 3 point fix with a tiny gap or from object with tiny gap. 

[Joe-Bouza]

you can get around the negative stations by using station equations, but you will still not appear as if the geometry starts at the desired place

[Anonymous]

@Beka_Tchigladze  have you tried rotating the alignment about the centre to move the start point? Ugly but quick fix. Not sure how it will affect anything that references it though.

Regards,

Peter

[Joe-Bouza]

@Anonymous  & @Beka_Tchigladze 

not as ugly as it may sound. It works and is fairly quick and easy

[Joe-Bouza]

https://autode.sk/2wXxcTs

[Beka_Tchigladze]

@Joe-Bouza 

@Anonymous 

if i want to create connecting alignment after I have problem it terminates connecting alignment when come across position of start station of circular alignments.

[Anonymous]

@Beka_Tchigladze  my last throw of the dice would be to create a 2D circle that your alignment needs to follow. Then use the 3 point option for your alignment radius. Select where you want the alignment to start, select the 2nd point about a quarter way round the circle in the direction you want your alignment to go, then select last point as close to the start point as you dare, but leaving a little gap (cannot select the same point as the start chainage).

If necessary you can then edit the start/end points using grips to move them around to place them where they need to be.

Regards,

Peter

[Joe-Bouza]

If the alignments are reacting to each other you may have them in a site. If they are not part of a parcel system use none site

[Joe-Bouza]

@Anonymous & @Beka_Tchigladze 

why are not post 10 and 11 not acceptable? Peter that's brilliant. rotating will place the start station where ever you want it

[Beka_Tchigladze]

I don't know why it doesn't works in my case does anyone has any idea? see the .gif

[Joe-Bouza]

Go back to my screen cast in post 12

you are not using the relative option

[Beka_Tchigladze]

I donot know either you are magician or I do not know what am i doing 😕

[Joe-Bouza]

rotate <select alignment> basepoint = center>> ****@>> pick current 0+00 >> Snap to new 0+00