Cutting with just the horizontal lines selected works fine. I've cut the object, separated it, isolated the left side and what I need to do here if figure out how to fill the hole. You said that I just have to planar it. I've tried that on the separated object, tried joining all the surfaces together and doing that, tried joining the individual sides so they form a half finished cube, and also tried selecting just the edges I want to planar, but it is not working for me. I haven't gotten it to fill a side even once. Is it really possible to fill the hole using Planar or would maybe using Lofting be a better choice here?

As a way of simplifying the problem, maybe I could understand if you could explain how to Planar this cube which had two of its adjacent faces deleted. Right now I only understand how to close the sides using Loft. For that to work I'd need to put a line where the missing edge should be though. I thought that could help Planar, but I can't join a line and a joined surface.

Actually, I think I see how it could be done. I can just separate the edges that I need from the original structure by copy pasting them, draw the missing lines, join them and then Planar them. I'd have to go manually like that for each face. Is that the process I should be taking? It more complicated than using Loft, so I am not sure if I am missing something.

Hi MRAKGR,

re:
> Cutting with just the horizontal lines selected works fine. I've cut the object, separated it, isolated
> the left side and what I need to do here if figure out how to fill the hole.

The boolean will also leave behind some vertical planes inside the object and you can make use of those to
help speed things along without needing to draw in anything.

So doing a boolean difference with just these lines as the cutting objects:



Select one face and then do a right-to-left crossing window to select all these faces and use Edit > Separate to break them off:



Then hiding that broken off piece will reveal this as the hole to fill, there are already these pieces in place left by the boolean:



Ctrl+C copy those pieces and then join them together with the main piece, that will leave holes like this:



Select the whole object (not edges) and then one use of Construct > Planar will fill in those holes. Get the other half
showing and paste in the vertical planes and repeat on the other side.

- Michael


EDIT: corrected crossing window direction, it's right-to-left for making a crossing window

Hi MRAKGR, for your cube with 2 faces deleted,

re:
> As a way of simplifying the problem, maybe I could understand if you could explain how to Planar this
> cube which had two of its adjacent faces deleted.

For that case you would need to draw in a line and make one planar face by selecting the line and 3 edges using Construct > Planar, then join that, then for the final plane you can select the entire object and use Construct > Planar to fill that last one in.

But for the actual object when you do the boolean it leaves behind half of the planes that you need so you can use those and you don't need to draw anything extra since when they are joined the remaining planar holes are isolated from each other and so can be filled in with one use of Construct > Planar with the main object selected.

- Michael

Yeah, I understand now. Thank you for taking the time to answer my questions.

Oops I had an error in one part that I wrote above, for the window selection that should be a right-to-left drag to make a "crossing" window (with dotted outline) that takes anything that crosses it instead of only fully contained.

- Michael