Copy Points along Z Axis - c# code Rhinocommons

Grasshopper Developer
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#1

Hi,

Newbie here at coding, I have been doing a lot this weekend though on a project and have created a mass of random points along my surface (topography). I now want to copy these points along the Z axis, all the same amount, and then connect the two points to create lines that will represent trees.

I have created this code to create the points, on my surface, which I have outputted to A = Points

image
image1446×646 263 KB

I want to, in a new c# component, now, as I said, copy these points vertically by some “z” amount (does not really matter), and then make lines between them.

I have a simple Grasshopper script that can do this, but I have been challenged to do this all in code…and for the life cannot figure it out.

I saw this other post which was projecting points, using this method:

    // Create verticals
var vert = new List<Line>();
for (int i = 0; i < segments; i++)
{
  var vertTemp = new Line(topChPts[i], botChPts[i]);
  if (vertTemp.Length > 0)
  {
    vert.Add(vertTemp);
  }
}

and something tells me I can use this and just replace the new Line(topChPts[i], botChPts[i]);

Portion w/ my points (topChPts being moved pts on top, and bot the bottom ones)

But in practice I do not know how to get my output of bottom points into the script and move them, and then incorporate those.

Any help much appreciated, thanks. File attached.Curves-script2.gh (13.0 KB)

#2

If you just want to move points just add two points together:

Line line = new Line(topChPts[i], topChPts[i]+ new Point3d(0,0,z));

#3

Hi Petras,

I was actually just looking at your PDF of c# on issuu…and from that I figured out how to accomplish what I want to do, sort of.

See here:

image

So I move all of the points up by 3 (meters in this case)

But for some reason it gives me this:
image
The same number of points (9408), but they are spread out much more… See the Green points are the original pts below,

All I want to do is copy those UP 3m.

image
image816×523 52.5 KB

the output A from RandomPts, are those points, which I input into pts in the next component.

Any idea how to fix?

thx!

#4

Try to change all what you wrote.

To

Point3d pts_ = new Point3d(pts);
pts_ +=Vector3d.ZAxis*3;
A=pts_;

You need to copy object first before and only then change its z coord.

Or in one line

A = new Point3d(pts.X, pts.Y, pts.Z+3);

#5

Perfect! So I understand, why am I multiplying ZAxis*3, and not stating the Z as 3?

And if I want to create lines between these two points now, would it just be:

Line tree = new Line(new Point3d(pts.X, pts.Y, pts.Z), new Point3d (npts.X, npts.Y, npts.Z));

A = tree;
#6

Yup,

Line tree = new Line(pts,npts);

Should work too.

#7

I am now trying to make pipes using the lines I previously created, using the BREPCreatePipe, but I am unsure how to syntax it correctly:

Brep[] CreatePipe(trees, double 0.1, true, Rhino.Geometry.PipeCapMode.Flat, bool fitRail, double 0.001, double 0.001);

is what I did, but …it does not work.

#8

For Lines here’s the thing (TR : radius, tol: DocTol):

image
image1272×335 19.8 KB

Meaning that you’ll get the first item ([0]) of the resulting Array … but better safe than sorry : use try/catch always. Some check of the TR/Line Length (VS tol or some other value) is not a bad idea either. In the above all these checks are done already elsewhere. If the Line is a LineCurve you don’t need the .ToNurbsCurve() part.

PS: You can use a public var (of type PipeCapMode) and control the result via some user defined value.