potree/src/extensions/PerspectiveCamera.js

WebGL point cloud viewer - WORK IN PROGRESS

THREE.PerspectiveCamera.prototype.zoomTo = function (node, factor) {
	if (!node.geometry && !node.boundingSphere && !node.boundingBox) {
		return;
	}

	if (node.geometry && node.geometry.boundingSphere === null) {
		node.geometry.computeBoundingSphere();
	}

	node.updateMatrixWorld();

	var bs;

	if (node.boundingSphere) {
		bs = node.boundingSphere;
	} else if (node.geometry && node.geometry.boundingSphere) {
		bs = node.geometry.boundingSphere;
	} else {
		bs = node.boundingBox.getBoundingSphere();
	}

	var _factor = factor || 1;

	bs = bs.clone().applyMatrix4(node.matrixWorld);
	var radius = bs.radius;
	var fovr = this.fov * Math.PI / 180;

	if (this.aspect < 1) {
		fovr = fovr * this.aspect;
	}

	var distanceFactor = Math.abs(radius / Math.sin(fovr / 2)) * _factor;

	var offset = this.getWorldDirection().multiplyScalar(-distanceFactor);
	this.position.copy(bs.center.clone().add(offset));
};

// THREE.PerspectiveCamera.prototype.zoomTo = function(node, factor){
//	if(factor === undefined){
//		factor = 1;
//	}
//
//	node.updateMatrixWorld();
//	this.updateMatrix();
//	this.updateMatrixWorld();
//
//	var box = Potree.utils.computeTransformedBoundingBox(node.boundingBox, node.matrixWorld);
//	var dir = new THREE.Vector3(0, 0, -1).applyQuaternion(this.quaternion);
//	var pos = box.center().sub(dir);
//
//	var ps = [
//		new THREE.Vector3(box.min.x, box.min.y, box.min.z),
//		new THREE.Vector3(box.min.x, box.min.y, box.min.z),
//		new THREE.Vector3(box.max.x, box.min.y, box.min.z),
//		new THREE.Vector3(box.min.x, box.max.y, box.min.z),
//		new THREE.Vector3(box.min.x, box.min.y, box.max.z),
//		new THREE.Vector3(box.min.x, box.max.y, box.max.z),
//		new THREE.Vector3(box.max.x, box.max.y, box.min.z),
//		new THREE.Vector3(box.max.x, box.min.y, box.max.z),
//		new THREE.Vector3(box.max.x, box.max.y, box.max.z)
//	];
//
//	var frustum = new THREE.Frustum();
//	frustum.setFromMatrix(new THREE.Matrix4().multiplyMatrices(this.projectionMatrix, this.matrixWorldInverse));
//
//	var max = Number.MIN_VALUE;
//	for(var i = 0; i < ps.length; i++){
//		var p  = ps[i];
//
//		var distance = Number.MIN_VALUE;
//		// iterate through left, right, top and bottom planes
//		for(var j = 0; j < frustum.planes.length-2; j++){
//			var plane = frustum.planes[j];
//			var ray = new THREE.Ray(p, dir);
//			var dI = ray.distanceToPlaneWithNegative(plane);
//			distance = Math.max(distance, dI);
//		}
//		max = Math.max(max, distance);
//	}
//	var offset = dir.clone().multiplyScalar(-max);
//	offset.multiplyScalar(factor);
//	pos.add(offset);
//	this.position.copy(pos);
//
// }