3D Game Programming

But, more importantly, when the avatar does cartwheels, the camera doesn’t

move. The avatar is cartwheeling, but the marker doesn’t spin. Since the

marker is not spinning, the camera doesn’t spin either.

In 3D programming, this marker is just a marker. It should be invisible. So

we don’t want to use meshes or geometries for this. Instead we use Object3D.

Let’s add the following code before the avatar-generated code, just after START

CODING ON THE NEXT LINE.

varmarker =newTHREE.Object3D();

scene.add(marker);

Now we change the avatar so that it is added to the marker instead of adding

it to the scene:

varavatar =newTHREE.Mesh(body, cover);

marker.add(avatar);

We also need to change how the camera is added. Instead of adding the

camera to the avatar, we add it to the marker.

marker.add(camera);

The last thing we need to change is the keyboard event listener. Instead of

changing the position of the avatar, we have to change the position of the

marker.

Chapter 4. Project: Moving Avatars • 46

Prepared exclusively for Michael Powell report erratum • discuss