Grasshopper Gaussian Curvature

Hi. I've made Gaussian curvature analysis of this surface on Rhinoceros. It seems to be correct.
I want to make the same analysis on Grasshopper.
I've tried to do this route, but it looks to be different from Rhino result and not correct.
How can i reproduce Rhino gaussian curvature analysis result on Grasshopper?

ps1: Rhino analysis left surface. Grasshopper analysis right surface

ps2. i've followed this video for Grasshopper analysis
https://www.youtube.com/watch?v=OCHJdlqs0Pc

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Replies to This Discussion

Permalink Reply by David Rutten on March 11, 2016 at 6:02am

The problem seems to be that the Auto Range picker in the Rhino curvature analysis command is not the same as just picking the lowest to highest values. It does something cleverer than that. If I just copy the values from the Rhino window, I get the same image (except of course using a different gradient).

Attachments:

analisicurvatura.gh, 11 KB

Permalink Reply by sixoid on March 15, 2016 at 4:56am

Thank you very much for your support.
another request: is possibile to find a grasshopper route that cut this surface by colours?
so I need a path of commands that divides the surface into parts according to the colors . is this possible ?

Permalink Reply by David Rutten on March 15, 2016 at 5:21am

Maybe. You could create a mesh X and Y directions correspond to the surface U and V direction, and whose elevation corresponds to the curvature. Then you could slice this mesh at any given elevation and thus find a polyline approximation of isocurvature lines.

Permalink Reply by sixoid on March 15, 2016 at 5:51am

i am sorry but i am beginner and haven't understood very well.
i mean to create a subdivision due to colours , like photo in attacked.
is it possible? can you share your idea, with a grasshopper file?
thanks in advance

Attachments:

Cattural.JPG, 33 KB

Permalink Reply by David Rutten on March 15, 2016 at 7:58am

Attachments:

isocurvature.3dm, 608 KB
isocurvature.gh, 9 KB

Permalink Reply by sixoid on March 15, 2016 at 10:30am

thank you so much!

Permalink Reply by sixoid on March 31, 2016 at 5:14am

hi. another problem to solve.
I would like to divide a surface with a rotational grid.
In particular i would make a u,v grid , on a surface , which can be freely rotated by an indicator and that always maintains the orthogonality of the axes . it's possible? I put the rhino files and grasshopper attached. I have already made this grid on the first and second surface in the file, but I have to swing the grid in the third surface. Indeed i need to rotate the grid axes of the third attachment surface (blu surface part....which corrisponds to blu grasshopper group).

ps. i followed this video to create the grid:
https://www.youtube.com/watch?v=Bn5RDfRQA0w

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