Graphics Reference
In-Depth Information
Moving a light source along a path
In the
Add an moving all-directional light
recipe, we moved a light source up and
down. While these simple kinds of paths are often enough, there are cases where you
want more control over how your light source moves through a scene. In this recipe,
we'll show you how you can move a light source along a predefined path.
Getting ready
To create this recipe, we'll use a
THREE.SplineCurve3D
and
THREE.SpotLight
object. As both of these objects are included with Three.js, we don't need to take any
steps to get ready. A good thing to do, however, is look at the provided example for
this recipe, which will show you what you'll get when you execute the steps from this
recipe when you run the
05.06-move-a-light-through-the-scene.html
ex-
ample:
In the screenshot, you can see a light that moves slowly along the purple line. In the
next section, we'll show you how you can create this yourself.
How to do it...
For this recipe, we first need to create the path that we'll follow:
1. For this path, we'll create
THREE.SplineCurve3
:
var spline = new THREE.SplineCurve3([
new THREE.Vector3(-100, 20, 100),
