GenerativeComponents Community Wiki Points On Curve

Points On Curve

Introduction

In this wiki, we will discuss about taking points in curve.
First, we are going to see the available nodes and techniques for this purpose.
Next, we are going to see how GC script can be used in fulfilling some advanced requirements.

Taking Points on Curve Using Available Node and Technique

We are going to place points on curve at a particular distance.
For this we use the node Point(technique :ByDistanceAlongCurve) and utility node Functioncall(function used: series).

Part I:
We attach an existing bspline curve to curve input port of point node. Line, polygon, polyline, arc etc. can also be used as the input.

Part II:
We attach the length of the curve as the input for the limit port of the series function.

Finally, we get the points by attaching functioncall1 to the DistanceAlongCurve port of the point node.

Points on Curve Simple method.gct

Taking Points in Curve Leveraging GC Script

In the above example, we have seen taking points at a fixed interval. In this example, the distance between the points will vary with segments of curve.

Problem Description:

The distance between the points for first 10km of the curve with be 500m and for the remaining part of the curve the distance will be between the points will be 1000m.

Solution:

We are going to write a function in GC script that will return the list of values required.
If you are new to scripting you can refer this SIG video.

This function is as follow

function (double LengthOfCurve, double SegmentLength, double Interval1, double Interval2)  //Creating function with required input ports
{
    double pointinterval= {};                                                              //Defining new empty list for storing the values
    double distance=0;
    while (distance<=LengthOfCurve)
    {
        if (distance<SegmentLength)
        {
            distance=distance+Interval1;
            pointinterval.Add(distance);                                                   //Adding values to the list
        }
        else
        {
            distance=distance+Interval2;
            pointinterval.Add(distance);
        }
    }
    return pointinterval;
}