Beginner needing a little help with a vaulted ceiling

[tmoff]

I am trying to model a single story home containing an attic. The ceiling maintains the same height throughout with the exception of a vaulted ceiling in one area. I am able to get everything modeled fine with no errors until I try and add the attic space. It is a hip roof and so I have used the automatic roof generation tool.

The problem is the vault interferes with the attic space. To account for the vaulted ceiling I have then tried using the subtract command under connect spaces to remove the vault part from the attic space. I have checked my vertices and there should be no overlap but I am still getting the collision error. Any ideas what I am doing wrong?

I appreciate the help!

[mhanson]

Hi. I wonder if this is actually a problem with which volume you select / and /or needing to trim spaces first. The error messages do not always give you enough clues for what is really wrong or whether it is just the sequence you are following. Take a look at these posts - viewtopic.php?t=3903 where Phil Cully responds:

...the space you are subtracting has to be entirely contained within the main volume and have at least 1 shared surface. If you have the two spaces intersecting so that part of the space you try to subtract is outside the main volume and part is inside then you will see the error "Cannot subtract spaces - unbounded zones".

These are the rules of the Subtract I'm afraid so if that's what you want to do you should first Trim the volume you want to subtract so that you are only left trying to subtract the part inside the main volume. Then it will work.
(Select the smaller space, click Connect Spaces button, then select the larger volume and click the Trim button to do this automatically)

and see if they help? Let us know how you get on. Best wishes.

[tmoff]

I am having trouble with this again. I am trying to model a house that has a vaulted ceiling and an attic. My process I was trying was this: Create all non-vaulted geometries, then create the attic space using the 'generate roofs for selected spaces command'. It would create the attic space as hoped and there would be no problems.

To add the vault, I created a separate space with the geometry of the vault (just the space that goes above the already created geometry, a triangular prism basically), and I would then align it as it should be and subtract the vault geometry from the attic. Now I may be wrong, but should this not leave an empty space in the attic of the exact dimensions of my vault? Once I then add the vault back in I get an intersection error between the vault and the attic.

I have no idea why this wouldn't work, and any help will be greatly appreciated!

Thank you again,
Tyler

-mhanson: sorry I never got back to you on this, some other jobs took priority and it completely slipped my mind.

[Lemcarr]

having sketchup plug in will help you in modelling..

but if you want to do it modelIT, its sometimes become tricky.
What I usually do is to model the complicated one separately, in your case, try modelling roof and floor separately then just combine it later.
for your roof, try trim then draw the attic again, sometimes adjacent wall do not completely removed and it clashes when you try to redraw your space.

Editing vertices can also help.

cheers,

[tmoff]

Alright I was able to get it to work. Thanks for the help, I ended up having to split the attic into two spaces. The geometry didn't change at all but for some reason that removed the intersection error.