Aframe update camera fov at runtime - three.js

Question

I've been trying to update properties of the camera on the fly to no avail - really don't want to setup multiple cameras and switch between them.
AFRAME.registerComponent("camera-controller", {
init: function() {
this.el.addEventListener('model-loaded', this.update.bind(this));
},
update: function() {
var data = this.data;
var el = this.el;
// el.fov = 75;
el.object3D.el.components.camera.data.fov = 20;
el.updateProjectionMatrix();
console.log(el.object3D.el.components.camera.data.fov);
}
});
camera.fov just returns undefined and updateProjectionMatrix() is not a function.

Answer 1

You can simply update the [camera]s FOV property via setAttribute("camera", "fov", newFOV). Something like this:
<script src="https://aframe.io/releases/1.2.0/aframe.min.js"></script>
<script>
AFRAME.registerComponent("foo", {
init: function() {
// grab the camera
const cam = document.querySelector("[camera]")
// on click
document.body.addEventListener("click", e => {
// grab the current FOV
const fov = cam.getAttribute("camera").fov
// update the camera with the new FOV
cam.setAttribute("camera", "fov", fov == 80 ? 120 : 80)
})
}
})
</script>
<a-scene foo>
<a-box position="-1 0.5 -3" rotation="0 45 0" color="#4CC3D9"></a-box>
<a-sphere position="0 1.25 -5" radius="1.25" color="#EF2D5E"></a-sphere>
<a-cylinder position="1 0.75 -3" radius="0.5" height="1.5" color="#FFC65D"></a-cylinder>
<a-plane position="0 0 -4" rotation="-90 0 0" width="4" height="4" color="#7BC8A4"></a-plane>
<a-sky color="#ECECEC"></a-sky>
</a-scene>
You can make the transition animated with the standard animation component (animating camera.fov) - here's an example with one animation (to utilize the above js logic, you could make two animations if you prefer a more 'declarative' style).