SplitCurve command doesnt work in nested list

Replies to This Discussion

Permalink Reply by David Rutten on May 9, 2012 at 2:48pm

Hi Guan,

python isn't my strong suit, what you need to do is measure the distance from each point to each curve, if that distance is less than, say, 1e-6 then the point can be said to be coincident with the curve. You should also check to make sure that the point isn't near the end of the curve, as splitting there won't make a difference. Once you've decided that the point needs to split the curve, perform a split and modify your curve list to include the two new curves and not the old curve. Repeat until all points and all curves have been handled.

I wrote a C# example, but it still has a bug. It will create an extra split point at the seam for closed curves. Perhaps it is smarter to collect all splitting parameters first, then be smart about where and how to split curves.

--

David Rutten

david@mcneel.com

Poprad, Slovakia

Attachments:

• SplitCurvesWithPoints.gh, 6 KB

Permalink Reply by Guan Xiong on May 9, 2012 at 3:42pm

Dear David,

Thank you so much for your reply, unfortunately i do not know how to use C++. Thanks a lot for your input. I guess its the split command in python for rhino that is not working fine as I am pretty confident that there is no problem with the script.

What the script does is that it checks if each point are on 1 curve that is currently on the loop and if they are intersection they will split it, and the split command doesnt work at this instance eventhough the intersection is there.

Thank you very much for your help. I really appreciate it! I guess I have to find another way of doing it..

Guan

Permalink Reply by Giulio Piacentino on May 10, 2012 at 4:20am

This might also be a question for the Rhino.Python forum. Did you post there, too?
Could you also please upload the file?

Thanks,

- Giulio
_________________
giulio@mcneel.com

Permalink Reply by Guan Xiong on May 10, 2012 at 8:24am

Hi Giulio,

Many thanks! I'm going to post it over there and hopefully get a feedback.

I found out that this command works when you instantiate a 'false' statement for creating a copy of the newly spitted curve instead of splitting the original curve.

It it was left as 'True', the loop will only run once because of the change in list due to the splitted original curve.

To my understanding it is the (splitting from the original curve) that amends and fucks up the whole list.

I wonder if there is a way to change the list of curves 'before splitting' to the newly 'splitted curves' while iterating in the loop. Which means as the loop runs the original list of curves slowly updates from its 'before split curve' to its 'splitted curves'.

Guan

Permalink Reply by Giulio Piacentino on May 10, 2012 at 8:52am

Guan, I'll be glad to take a look, but I'm having trouble trying. I'd have to retype the whole script from the picture. Could you post it?

Please also state what you would like to do in general and comment the part that is not working.

Thanks for your cooperation,

- Giulio
_________________
giulio@mcneel.com

Permalink Reply by shehzad irani on January 15, 2017 at 5:07pm

Hi,

have the points, have the curves, but still no split.

is it an accuracy or a parametrization problem?

shehzad

Attachments:

• grid.gh, 101 KB

Permalink Reply by Giulio Piacentino on January 16, 2017 at 2:49am

Hi Shehzad,

this would probably make a good candidate for a new discussion.

From a quick look, it seems that there are different points coming from different routes attempting to divide each curve, and so the process is failing.

Giulio
--
Giulio Piacentino
for Robert McNeel & Associates
giulio@mcneel.com

Permalink Reply by shehzad irani on January 17, 2017 at 12:09am

Hi, 

I thought it related to this topic hence i put it here. sure, will start a new discussion. 

I don't get ""points from different routes", i hope to understand more.. 

Thanks for taking the time...