Trying to create terrain surface from curve network

I’m trying to create surface from curve network. Upon using the network surf command, it highlights the problematic curve. I delete it, then it highlights another problematic curve right next to it. If I delete that, then it highlights another one which is right next to it. This keeps on happening.

What am I doing wrong?

How can I generate a nurbs surface from these curves?

How do I detect what exactly is the problem in my curves?

I am attaching the file.

Kindly help.

TERRAIN 8TH NOV.3dm (746.3 KB)

I don’t know why the curve sorting is having trouble with these - it looks to me like they are correct. Selecting one by one in order (NoAutoSort option) does work… I’ll get this on the pile for a developer to look at.

Oh wait - @archz2 - there is a block in there that you get if you window everything - leave that out and it works.

Command: '_SelAll
1 block instance, 156 curves added to selection.


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How do I find that block in a crowd of 156 curves?

Hello - use SelCrv to select only the curves, use the SelectionFilter, or use SelBlockInstance to locate and delete the block.


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Thanks a ton. That worked!!

Edit: Okay, well, I was able to select the curves now,

I got a box having options for tolerances, edge curves and interior curves. My terrain got four alphabet tags A, B, C, D on each of the outer edges. After I pressed enter (accepting the default settings as set by Rhino as I am using this feature for the first time ever), my laptop fan started moving very fast, I waited patiently even thought the Rhino window faded,

the RAM usage shot up to 10GB for Rhino as seen in the Windows task manager, then I got this message after waiting for 30 minutes

What should I do now?

Hi @archz2
With this many sections, you might try Patch instead - that might give you a better and lighter result, depending on the accuracy needed. Increase the number of UV to eg. 78 (the amount of cross sections you have in each direction).
HTH, Jakob
Edit: I did your surface as NetworkSrfand it is insanely complex because of the amount and complexity of the cross sections. I strongly suggest you either rebuild the sections first or use Patch instead.This screen grab shows the lower fifth of the square with isocurves on…

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Thank you so much! Patch works so fast and easy! :+1::+1: