Remove surface overlap

My first go at Grasshopper, and I seem to have hit a snag I cannot figure out. I am guessing there is something about object trees I do not understand ... despite watching David Rutten’s excellent video tutorial. I have two surfaces that have similar points in X and Y but cross in Z; and I wish to remove this crossover by pushing the one surface under the other surface in the areas where they cross. I rebuild the two surfaces to have the same number of points, I pull the points from each surface (SDivide), deconstruct the points on each surface (pDecon), sort the Z values of points on the respective surfaces, and then try to reverse the process to reconstruct a new surface with the sorted Z values (Pt & SrfGrid). The results of each step seem reasonable to me, but I get an error on the final SrfGrid operator (“The Ucount value is not valid for this number of points”). I am perplexed...any suggestions on the fix? I attach the 3dm and gh files if case anyone is willing to have a look and advise. Thanks.

Attachments:

pushdown.gh, 9 KB
SurfacePush.3dm, 344 KB

Replies to This Discussion

Permalink Reply by Hyungsoo Kim on January 21, 2015 at 10:19am

Hi, Brian.

You should flatten point data tree on "p" input and add 1 to "U" input count for Surface from points component.

Permalink Reply by Brian Willis on January 21, 2015 at 12:35pm

Many thanks Hyungsoo!

Modified field works great!

Attachments:

pushdown.gh, 28 KB

Permalink Reply by Brian Willis on May 1, 2015 at 11:06am

Taking my previous question one step further, does anyone know how to get if specific points are selected on a surface from rhino into grasshopper. That is, as above I wish to remove overlap between two selected surfaces, each surface with the same arrangement of points in x,y but not z. But now I wish to remove surface overlap only if points on the surface are selected. Not sure if I am being clear, but what I guess I need is a yes/no list for each point is as too if it is or is not selected...but I can not seem to find that type of option in Grasshopper. I would be grateful for any advice.

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