Hello
Wouldn't there be a constraint to align a component equidistant from 2 faces/planes, in short to center it?
So far I'm creating midplanes between faces in a component to align it with a midplane of another component, but if I could spare myself that would be good.
Oh and it would be for immobile components, so no more slide constraint.
Slide stress (advanced constraints). No need to make a tutorial 
3/4 of an hour later:
I hadn't read to the end 
Well, if I could avoid the slide, which is surely a little heavier than a simple coincidence.
If no one has better, I'll use the slide then.
Thank you
Hello
When I know that the elements will have to be aligned by their center, I draw them centered on their origin. That way, one of the basic planes can serve as a plane of symmetry.
After that, all that remains is to align the front and/or straight and/or top planes according to the need.
Otherwise, I take the time to create a middle shot to make the alignments afterwards.
Good luck.
clearly, apart from the slide... I can't see.
There is also the constraint of symmetry. But it forces you to have a middle plan anyway
Thank you all.
It's not your fault, I had added this clarification just before you posted your answer.
@a_eriaud Yes, that's what I do and was trying to avoid as much as possible.
It would seem.
A slide constraint alone is finally perhaps lighter than additional planes + a coincidence. At the very least, it will avoid visually overloading the components when the plans are visible.
Thinking about it, though, I don't really see how to do it. Because a component equidistant from two planes ... It is important to indicate which faces of the component are to be taken into account
You're right @coin37coin .
I started from the principle of the minimum and maximum limits of the component, because my current case is a " pillar " with regular dimensions. But supposing that I add a cornice that does not go around it, the limits would no longer be the same, which would off-center the pillar.
So indeed, the principle of the slide seems to be the only possible constraint to fulfill this role.