Analyze surface by change of angle

Hi, I am new to grasshopper, I am trying to analyze a surface by its angle variation.

I only need three outputs:

The area lower than 20 degrees

The area between 20 and 40 degrees, and

The area above 40 degrees

I found a program already made but it only analyzes Mean or Gaussian surfaces (I added the file), and I have no idea how to change this paramater into specific angle variations.

The purpose of this is to find the exact limit of a topography where the terrain's slope turns sharper, which to our government are the angles I express before.

I would appreciate your help,

Attachments:

Screen Shot 2016-07-29 at 4.39.31 PM.png, 94 KB
Untitled-1.png, 89 KB
51_4f4641fa9f809.gh, 14 KB

Replies to This Discussion

Permalink Reply by Hyungsoo Kim on August 23, 2016 at 1:33pm

Hi.

I wonder if this is helpful. Check attached. Best.

Attachments:

51_4f4641fa9f809_re.gh, 23 KB

Permalink Reply by Rudy M Pineda on August 23, 2016 at 3:28pm

It worked in a tiny surface, like the one you tested it. But I turn all red when I applied it to the terrain I'm analyzing (check attachment).

Thank you!

Permalink Reply by Rudy M Pineda on August 23, 2016 at 3:30pm

Attachments:

002.png, 1.1 MB

Permalink Reply by Hyungsoo Kim on August 23, 2016 at 3:32pm

Post data

Permalink Reply by Hyungsoo Kim on August 23, 2016 at 3:39pm

I suppose you'd be better off flipping your terrain surface normal direction.

Permalink Reply by Rudy M Pineda on August 23, 2016 at 3:46pm

hahahahaha, I already tried that. Well, I flipped it in various direction. I do not know what normal direction would be, sorry.

This is the file

Attachments:

GR.3dm, 1.2 MB

Permalink Reply by Hyungsoo Kim on August 23, 2016 at 4:02pm

Good luck.

Attachments:

51_4f4641fa9f809_reV2.gh, 257 KB

Permalink Reply by Rudy M Pineda on August 23, 2016 at 4:46pm

Genius! thank you very much!

I don't want to take any more time from you, this is the last thing, what tools would you recommend me to draw the border of the areas with a line? So when I bake it, I can do a make2d in order to transfer this information into a blueprint

I'm sorry for the bother, and thank you very much!

Permalink Reply by Hyungsoo Kim on August 23, 2016 at 8:45pm

You can project the result onto a plane. You can get nurbs or mesh(with colors) either.

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