Topography Modeling

Replies to This Discussion

Permalink Reply by peter fotiadis on February 20, 2015 at 6:37am

You mean a List of topo curves/polylines? Easy (but read the bad news as exposed in your other thread, he he).

In the mean time have fun with this: https://www.google.com/url?q=http://www.grasshopper3d.com/forum/top...

What to you need is an "inverse" thing: get the topo curves (hopefully with some Z) patch them (this IS tricky and most probably requires 2 "passes") and ... then either create trimmed surfaces (see the example with holes in the above thread)  and/or closed Breps (I'll do the "conversion" soon - I do hope). Is it a problem with you if the solution is in code? (it could be much faster for me to add some lines and delete others than to reconstruct the whole def using components).

Permalink Reply by pirooz on February 20, 2015 at 7:05am

hi peter,

no . i want modeling the topography curve. but just i have point curve in OSM File

Attachments:

• Untitled-1.png, 92 KB

Permalink Reply by Filippos Filippidis on February 20, 2015 at 8:16am

If I understand you correctly, you could use mesh from points or delaunay mesh on your points to get the geometry landscape and then just contour it to get the topo crvs..

Permalink Reply by ng5 Alex on February 20, 2015 at 8:36am

If you have the topography points organized as a tree, with each brunch containing the points of each curve, then you can use polyline or whatever curve tool suits yours needs to have the topo curves. Its difficult to tell from the screenshot what is your current progress. It looks like they are not organized, so fillippos suggestion might do the job, but uploading the definition would be helpfull

Permalink Reply by peter fotiadis on February 20, 2015 at 10:03am

Hmm ... :

1. There's points from OSM data in Rhino, right? (if they are "chaotic" or not it's not an issue: see 2).

2. You want to create a nurbs surface/closed Brep out of them? right? (patch pts to  surface is my favorite way [or Loft the curves but that has serious limitations if holes/"gaps" are around etc etc] since I never work with meshes: this is what the def posted above does). And then intersect the surface with N "Z" planes to get the topo curves, right? (this is also the def ... blah, blah).

3. Anyway to make a long story short: post the pts and your topo curves could be yours rather ASAP. Unfortunately I don't have the def with standard GH components but here what it matters is the result.

best, Peter

Permalink Reply by ng5 Alex on February 20, 2015 at 10:06am

of course its not, it just dictates for different approaches