Geometries and Meshes - Three.js - page 104

Creating a spline curve between two
points
When you create visualizations and, for instance, want to visualize the flight path of
an airplane, drawing a curve between the start and end point is a good approach.
In this recipe, we'll show you how you can do this using the standard
THREE.TubeGeometry object.
Getting ready
When you open the example for this recipe, 02.12-create-spline-curve.html ,
you can see a tube geometry that curves from start to end:
In the upcoming section, we'll explain step by step how to create this curve.
How to do it...
To create a curved spline, like what is shown in the preceding example, we need to
take a couple of simple steps:
1. The first thing we need to do is define some constants for this curve:
var numPoints = 100;
var start = new THREE.Vector3(-20, 0, 0);