Create plots from lines

Dear All,

I'm trying to model an urban area to do some analysis (Similar to Space Syntax), I have used Google maps to trace the plots, roads, zones...etc

The attached file shows a small part of the overall master-plan to save you the hassle.

What I basically want to do is to convert these lines into individual plots to start analyzing them.

I have no clue on how to do something like that. Can someone help please. Tracing them by hand would take ages. I'm sure there should be a simple solution to automate this.

Many thanks in advance.

regards,

Omar

Attachments:

Plots from lines_base plan.3dm, 144 KB

Replies to This Discussion

Permalink Reply by Hyungsoo Kim on April 4, 2015 at 9:28am

I don’t know if it will help you or not. Surface split operation will take time.

Attachments:

Plotsfromlines_baseplan_re.3dm, 2.3 MB
Plotsfromlines_baseplan_re.gh, 12 KB

Permalink Reply by Pieter Segeren on April 4, 2015 at 10:04am

Hi Omar, Hyungsoo,
there is a component out there that does this, but I forgot the name...
In the mean time: you can speed up the SrfSplit operation quite a bit by doing this:

But then again 15 seconds isn't that bad compared to tracing them by hand :)

Permalink Reply by Pieter Segeren on April 4, 2015 at 10:08am

Forgot the file... :/

Attachments:

Split-SpeedUp_PSG.gh, 64 KB

Permalink Reply by Hyungsoo Kim on April 4, 2015 at 10:22am

Nice solution, Pieter! Please let me know if you can remind that component later.

Permalink Reply by Pieter Segeren on April 4, 2015 at 11:56am

Thank you Hyungsoo.

Ah, I found what I thought could solve this: Closed Curve Intersection Network, great work by David Stasiuk. Too bad I remembered wrong: it's of no use here (results in duplicates and random curve directions).

Try searching the forum for CurveBoolean and half-edge (half-curve) approaches.

Permalink Reply by Omar Helmy on April 4, 2015 at 2:00pm

And thank you Pieter, that's very clever,I haven't looked at how it works yet , but it does...

Permalink Reply by Pieter Segeren on April 4, 2015 at 2:29pm

You're welcome Omar:
I'm making separate branches from the open curves, by checking how close their startpoints are to each of the planar surfaces (from the closed curves). If the distance is not within the 'near zero' tolerance, it gets culled from the branch. Now you have for each surface a branch/list of open curves to split it with.

Permalink Reply by Omar Helmy on April 5, 2015 at 9:32am

Brilliant... On my machine it runs almost 35 times faster.

Just makes you wonder how many such GH hacks are hiding in plain site :)

Permalink Reply by Omar Helmy on April 4, 2015 at 1:53pm

Thanks a million Hyungsoo, this works perfectly.

Time is not an issue for me, because I'm going to do this operation once, it's an existing urban plan, so no iterations.

Thanks again

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