How to determine if a object is out of view frustum

[philxia]

Dear experts, I am working on a feature to show the temporary dimension between the cursor and the objects in the scene. It requires a lot of computation when there are so many objects in the scene, so I want to optimize that to only show the temporary dimension when the objects are in the view frustum.
Good case: This shows the temp dimension as the wall is in the view frustum.

Bad case: No, I don't want to show this temp dimension as the wall is not in the view frustum.

Any ideas? Thanks.

[bhushan6]

There is Frustum class in three js, you should check that. Pretty sure it'll solve your problem

[philxia]

Thank you, @bhushan6. Yes, it works.