Objects and Camera field of view

is there a way to know when an object is in the field of view of a camera:confused:

tanks & Salutations

Change the view to camera view, the inner dotted line is definetly in, the outer may clip off depending on tv.

If you mean depth (camera clipping) with camera selected, goto edit (f9) look for show: put limits on, in top view you see a line showing the area in view. Paspertout is good also, try it.

I mean such that you can put a constraint on it

Like if you have Text and the camera move around this object you can make the text rotate to make the text always face the camera so you can read it

but if the object is out of the filed of view of the camera it does not affect the text object!