Find local lowest points on a mesh

Hi,

I am looking for a solution to find the local lowest points on a mesh, similar to extremes on a curve, just with multiple points as an outcome.

Does somebody already have a solution for that ? Attached find a example mesh.

Attachments:

CB_Lowestet_LocalPoints.3dm, 822 KB

Replies to This Discussion

Permalink Reply by Hyungsoo Kim on October 14, 2016 at 2:47pm

Looking for something like this?

Attachments:

LowestPoint.gh, 66 KB

Permalink Reply by Curime Batliner on October 14, 2016 at 3:09pm

Thank you, but this is not what I am looking for. I need the the lowest point, for each local valley of the mesh. Your solution returns me a domain of points based on the lowest point of the mesh.

Permalink Reply by Hyungsoo Kim on October 14, 2016 at 3:15pm

Then, how can you define each local valley area?

Permalink Reply by Ethan Gross on October 14, 2016 at 4:03pm

If the vertex normal points in the -z direction and the normals of the neighboring vertices also all have a component in the -z direction (i.e. not a saddle surface)?

Permalink Reply by Ethan Gross on October 15, 2016 at 12:50am

I decided to just look for all vertices whose z value is less than their nearest neighbors. It seems to work here because your mesh is nice and smooth. If it was "corrugated" at all, it could get messy.

Attachments:

lowest points on mesh.gh, 67 KB

Permalink Reply by Hyungsoo Kim on October 15, 2016 at 2:32am

Permalink Reply by Pieter Segeren on October 15, 2016 at 4:13am

Very nice solution Ethan. I resorted to throwing in a handful of marbles (using Kangaroo) and then cull duplicates. Just noticed I was mistakenly working with the surface instead of the mesh...