Camera Zoom To Fit Object

Questions
,
6

Hi guys!
Thanks so much for the replies!!!

Let’s see if with your code I can get to the desired result.
I would like to remove the restriction of having the camera in front of the object.

These are my changes. Not tested since I am on a really old laptop right now, but in theory should work. Now we should be able to put the camera on ANY position and still make zoom work:

const fitCameraToObject = function ( camera, object, offset, controls ) {

	offset = offset || 1.25;

	const boundingBox = new THREE.Box3();

	// get bounding box of object - this will be used to setup controls and camera
	boundingBox.setFromObject( object );

	const center = boundingBox.getCenter();

	const size = boundingBox.getSize();

	// get the max side of the bounding box (fits to width OR height as needed )
	const maxDim = Math.max( size.x, size.y, size.z );
	const fov = camera.fov * ( Math.PI / 180 );
	let cameraZ = Math.abs( maxDim / 2 * Math.tan( fov * 2 ) ); //Applied fifonik correction

	cameraZ *= offset; // zoom out a little so that objects don't fill the screen

	// <--- NEW CODE
	//Method 1 to get object's world position
	scene.updateMatrixWorld(); //Update world positions
	var objectWorldPosition = new THREE.Vector3();
	objectWorldPosition.setFromMatrixPosition( object.matrixWorld );
	
	//Method 2 to get object's world position
	//objectWorldPosition = object.getWorldPosition();

	const directionVector = camera.position.sub(objectWorldPosition); 	//Get vector from camera to object
	const unitDirectionVector = directionVector.normalize(); // Convert to unit vector
	camera.position = unitDirectionVector.multiplyScalar(cameraZ); //Multiply unit vector times cameraZ distance
	camera.lookAt(objectWorldPosition); //Look at object
	// --->

	const minZ = boundingBox.min.z;
	const cameraToFarEdge = ( minZ < 0 ) ? -minZ + cameraZ : cameraZ - minZ;

	camera.far = cameraToFarEdge * 3;
	camera.updateProjectionMatrix();

	if ( controls ) {

	  // set camera to rotate around center of loaded object
	  controls.target = center;

	  // prevent camera from zooming out far enough to create far plane cutoff
	  controls.maxDistance = cameraToFarEdge * 2;

	  controls.saveState();

	} else {

		camera.lookAt( center )

   }
}

Could you guys test it and let me know what you think?
Thanks!!!