I am attempting to determine the current zoom level in a Three.js scene. Specifically, I am interested in detecting the "zoom" or dolly effect applied by the mouse wheel action. For instance, imagine a simple scene consisting of a perspective camera, orbit controls, and an object.
1: `<= see the test here
controls = new THREE.OrbitControls( camera );
controls.dollyOut = function(){ }
controls.dollyIn = function(){ }
controls.addEventListener('change', renderlog); ....`
Thank you!
When utilizing a PerspectiveCamera along with OrbitControls, it is important to note that the concept of "zooming" functions differently compared to an orthographic camera. Instead of adjusting a zoom variable, you achieve the effect of "zooming" by moving the camera closer to the target.
This implies that you can determine the zoom distance by calculating the distance between the target and the camera position.
var zoom = controls.target.distanceTo(controls.object.position)
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