How to create a surface through various points?

I have survey data in the form of NEZ coordinates of a ditch.

I want to create the surface of the ditch. That is, a surface that best approximates the real surface of the ditch based on the survey data.

In two dimensions, this would mean, to join the adjacent points. This needs to be done in 3D.

Replies to This Discussion

Permalink Reply by David Rutten on March 5, 2013 at 3:48am

Are you specifically looking for a Nurbs surface or is a mesh also acceptable? If you're happy with a mesh, you can use Delaunay Triangulation. If you need a surface then I think you'll need to Patch the points, unfortunately Patch won't be available until the next release goes out. You can always bake the points of course and use the Rhino Patch command manually.

David Rutten

david@mcneel.com

Poprad, Slovakia

Permalink Reply by Chintan Pathak on March 16, 2013 at 12:00am

I tried PATCH in Rhino once with default options and then changing the U and V values to 20. The results are as under.

Step 1: Use the Grasshopper component PointXYZ with the values of X, Y and Z obtained from the Total Station etc survey.

Step 2: Use the Bake option in the PointXYZ menu to transfer the points to Rhino. This is how the point cloud looks after baking. These points have different elevations.

Step 3: Run the PATCH command in Rhino. It asks to select the points. The result obtained with default settings. Quite good representation of actual topography.

Step 3.1: Changing the value of parameters U and V in PATCH options to 20 each resulted in the next image.

AWESOME!!!!

Attachments:

PointData wit TS.xlsx, 25 KB
PointDataBaked.gh, 3 KB

Permalink Reply by mahshid jangali on September 7, 2016 at 9:13am

the plane dosnt pass all my points! What can i do?

Permalink Reply by mahshid jangali on September 7, 2016 at 2:33pm

the plane dosnt pass all my points! What can i do?

Permalink Reply by Chintan Pathak on September 7, 2016 at 3:45pm

No surface will pass through all points. But you may try changing the options to improve the output. If the problem persists, then I suggest you make a new post with your points in a Gh file, so people can help.

Permalink Reply by mahshid jangali on September 10, 2016 at 2:13pm

its my file

Attachments: