Text + Nodes causes errors

[malani-art]

Hello,

For some reason, when I try to implement nodes and text at the same time, it throws this error:

THREE.Sprite: "Raycaster.camera" needs to be set in order to raycast against sprites.
Uncaught TypeError: e.camera is null

You can see this happening in the example too: https://vasturiano.github.io/3d-force-graph-vr/example/text-links/

Any idea how I can fix this? I'd ideally like to have both the sphere nodes and text apparent.

Thank you!

[vasturiano]

@malani-art please see #21 and #31.