Zoom in to the center of the 2d rectangle area

How do I do the scaling of the area, here I draw a rectangle using the drag and drop method, I can do the 2d to 3d Conversion using

projector.unprojectVector(pos, camera);


but i can't zoom in to fix the area,

Do I need to apply local to world coordinates? if so how to do it? I only have THREE.PointCloud grid.

enter image description here u can see the image, it will show what i am trying to do.

thanks in advance.


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