Simple Arc to Element / Arc Between Points problem

Offline Tomasz Olichwier over 5 years ago

Hi All,

I am trying to create an arc tangential at one end to a circle, ending at a random point, this is the result, close to what I want:

When I specify the exact radius (either during arc creation process or after), it just jumps to alternative tangential point on a circle:

Is it a bug or can I obtain alternate result? Can't see any option for that.

Tried on MX and ORD v. 10.02.00.60 and I'm getting the same result.

Also, I was trying to work around it using Arc Between Points with a Tangent snap to a circle, resulting in a crash.

Tried it many times, as I could not believe it hangs on that, but it does, both packages, every time.

Any help/explanation would be welcome.

Kind regards, Tomasz.

0 Offline Holly Herring Mon, Mar 26 2018 9:35 AM
Hi Tomasz,

Can you please tell me the exact tool you are using in ORD and how you implement it? I used the Arc Between Elements command to recreate the first picture you show. It created a curve that is tangent to the circle. Have you tried this method?

Holly

For more information about the Road and Site design tools, visit the Road and Site design WIKI at: http://communities.bentley.com/products/road___site_design/w/road_and_site_design__wiki
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0 Offline Tomasz Olichwier Mon, Mar 26 2018 12:23 PM in reply to Holly Herring
Hi Holly,

The exact tools I tried are listed in the subject field of my initial post - Simple Arc to Element / Arc Between Points.

To implement them I follow tool prompts, applying tangency to the arc end landing at the circle and choosing a random point at some distance away from the circle for the other end. Nothing overcomplicated. The point is fixed and I want ORD to find me a tangential arc of given radius.

In my case I can't use Arc Between Elements as I have only one element.

It's not about tools not keeping tangency, it's about choosing the desired solution out of theoretical four and being able to keep it (or change it as I please) after editing curve parameters.

Thanks for digging, Tomasz.
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0 Offline Holly Herring Tue, Mar 27 2018 9:38 AM in reply to Tomasz Olichwier
I create Enhancement 868432: Arc to Element: Choose which side of circle to declare tangency for development to review your request for future releases of OpenRoads Designer. As a workaround, I recommend drawing an element to represent your end tangency. Then use the Simple Arc Between Elements to get a concave curve that terminates tangent to the bottom half of the circle you show in your screenshot.

For more information about the Road and Site design tools, visit the Road and Site design WIKI at: http://communities.bentley.com/products/road___site_design/w/road_and_site_design__wiki
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0 Offline Stewart Hellen Tue, Mar 27 2018 10:19 AM

Tomasz, have you tried the SHIFT key, after specifying the end point. This sometimes offers an alternative solution.
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0 Offline Tomasz Olichwier Tue, Mar 27 2018 10:37 AM in reply to Stewart Hellen

Tried just now to no avail. Thanks.
Even if it worked during edit, that would still leave the problem of an arc jumping to a different tangency solution after placement the moment I amend radius.
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