Local Lowest Points

Hey guys,

I was trying to find lowest points on a landform(mesh) but could not figure it out via grasshopper, so I write a python script, hope this may help someone who has the same problem...

PS.I am trying to develop some geographic analysis tools using python in grasshopper. If you have some specific ideas(or problems) please let me know, we can work together!

Leo

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Permalink Reply by LabLeo on December 5, 2016 at 9:50pm

Hi Kevin,

The idea of shortest path with grade limitations is cool. If I have time I will try writing it. I think the basic idea could be:

1. define a starting point on mesh StartPt

2. define an end point on mesh EndPt

3. set a slope limitation, e.g. 0.1

4. start checking 'neighborhood points' of StartPt, if it is smaller than 0.1, draw a line

5. loop 4

6. After every point added, check the distance from this point to the EndPt. If the distance is smaller than a number (let's say 5 meters), we say this is a trial option.

7. Return all of the possible trial, find the shortest one.

ps. this script might be inaccurate if the mesh is not fine enough. A better idea may be also check the points on each faces, but that may slow down the process.

Hope this helps.

Permalink Reply by Keith VanDerSys on February 25, 2017 at 3:13pm

Leo,

Here's my version of path finding guided by a slope parameters. There's both a directed (fixed start & end) single/ multi agent & non-directed single/ multi agent version. Both operate by a step size & slope % logic using the Anemone plugin.

Let me know if you have any thoughts on improving it.

Keith

Permalink Reply by Jireh Dagdag on November 15, 2017 at 2:43am