Is it wrong in lecture...Church Vault difference?!

Hi,
@Pavao_Akrap
I think I know where the issue comes from, tell me if it is the right answer to your problem.

If I get it right you tried to replicate Michael’s solution and couldn’t manage with boolean union, so you found an other solution with boolean Intersect

The last image is what you got stuck on with trying Union, right ?

Well let’s get one step before applying the boolean modifier.
You should have ended up with something like that:


(Mine is not really detailled)

Then you apply the boolean modifier with union (let’s hide the other mesh to get a better view).


Ah ha I got the same result as you! I think I did everything like you did :slight_smile:

What’s the solution then ?
You said:

Exactly it, if you change from Bmesh to Carve it should change like this:


(You said you couldn’t get results, but did you hide the other mesh to see actual differences ?)
And if you apply and then rotate 180 around Z axis, you should have your structure!

Then join the two, solidify and it’s done!
Unfortunately I can’t say what this Solver does exactly because there is a TODO on the corresponding line in the blender manual (Boolean Modifier - Blender 5.0 Manual). My guess is that it is a way to figure out the cuts between the two objects.
I hope this helps !

Cheers !